The dilated portion of the common carotid artery at its bifurcation into external and internal carotids. It contains baroreceptors which, when stimulated, cause slowing of the heart, vasodilatation, and a fall in blood pressure.
Either of the two principal arteries on both sides of the neck that supply blood to the head and neck; each divides into two branches, the internal carotid artery and the external carotid artery.
Receptors in the vascular system, particularly the aorta and carotid sinus, which are sensitive to stretch of the vessel walls.
Narrowing or stricture of any part of the CAROTID ARTERIES, most often due to atherosclerotic plaque formation. Ulcerations may form in atherosclerotic plaques and induce THROMBUS formation. Platelet or cholesterol emboli may arise from stenotic carotid lesions and induce a TRANSIENT ISCHEMIC ATTACK; CEREBROVASCULAR ACCIDENT; or temporary blindness (AMAUROSIS FUGAX). (From Adams et al., Principles of Neurology, 6th ed, pp 822-3)
Pathological conditions involving the CAROTID ARTERIES, including the common, internal, and external carotid arteries. ATHEROSCLEROSIS and TRAUMA are relatively frequent causes of carotid artery pathology.
A small cluster of chemoreceptive and supporting cells located near the bifurcation of the internal carotid artery. The carotid body, which is richly supplied with fenestrated capillaries, senses the pH, carbon dioxide, and oxygen concentrations in the blood and plays a crucial role in their homeostatic control.
A transient loss of consciousness and postural tone caused by diminished blood flow to the brain (i.e., BRAIN ISCHEMIA). Presyncope refers to the sensation of lightheadedness and loss of strength that precedes a syncopal event or accompanies an incomplete syncope. (From Adams et al., Principles of Neurology, 6th ed, pp367-9)
The excision of the thickened, atheromatous tunica intima of a carotid artery.
Branch of the common carotid artery which supplies the anterior part of the brain, the eye and its appendages, the forehead and nose.
Cells specialized to detect chemical substances and relay that information centrally in the nervous system. Chemoreceptor cells may monitor external stimuli, as in TASTE and OLFACTION, or internal stimuli, such as the concentrations of OXYGEN and CARBON DIOXIDE in the blood.
The systematic and methodical manipulations of body tissues best performed with the hands for the purpose of affecting the nervous and muscular systems and the general circulation.
The two principal arteries supplying the structures of the head and neck. They ascend in the neck, one on each side, and at the level of the upper border of the thyroid cartilage, each divides into two branches, the external (CAROTID ARTERY, EXTERNAL) and internal (CAROTID ARTERY, INTERNAL) carotid arteries.
Large endothelium-lined venous channels situated between the two layers of DURA MATER, the endosteal and the meningeal layers. They are devoid of valves and are parts of the venous system of dura mater. Major cranial sinuses include a postero-superior group (such as superior sagittal, inferior sagittal, straight, transverse, and occipital) and an antero-inferior group (such as cavernous, petrosal, and basilar plexus).
The air space located in the body of the MAXILLARY BONE near each cheek. Each maxillary sinus communicates with the middle passage (meatus) of the NASAL CAVITY on the same side.
The dilatation of the aortic wall behind each of the cusps of the aortic valve.
An involuntary movement or exercise of function in a part, excited in response to a stimulus applied to the periphery and transmitted to the brain or spinal cord.
An irregularly shaped venous space in the dura mater at either side of the sphenoid bone.
Air-filled spaces located within the bones around the NASAL CAVITY. They are extensions of the nasal cavity and lined by the ciliated NASAL MUCOSA. Each sinus is named for the cranial bone in which it is located, such as the ETHMOID SINUS; the FRONTAL SINUS; the MAXILLARY SINUS; and the SPHENOID SINUS.
Branch of the common carotid artery which supplies the exterior of the head, the face, and the greater part of the neck.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
The resection or removal of the nerve to an organ or part. (Dorland, 28th ed)
A response by the BARORECEPTORS to increased BLOOD PRESSURE. Increased pressure stretches BLOOD VESSELS which activates the baroreceptors in the vessel walls. The net response of the CENTRAL NERVOUS SYSTEM is a reduction of central sympathetic outflow. This reduces blood pressure both by decreasing peripheral VASCULAR RESISTANCE and by lowering CARDIAC OUTPUT. Because the baroreceptors are tonically active, the baroreflex can compensate rapidly for both increases and decreases in blood pressure.
One of the paired, but seldom symmetrical, air spaces located between the inner and outer compact layers of the FRONTAL BONE in the forehead.
The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)
One of the paired air spaces located in the body of the SPHENOID BONE behind the ETHMOID BONE in the middle of the skull. Sphenoid sinus communicates with the posterosuperior part of NASAL CAVITY on the same side.
Diseases affecting or involving the PARANASAL SINUSES and generally manifesting as inflammation, abscesses, cysts, or tumors.
A standard and widely accepted diagnostic test used to identify patients who have a vasodepressive and/or cardioinhibitory response as a cause of syncope. (From Braunwald, Heart Disease, 7th ed)
The interruption or removal of any part of the vagus (10th cranial) nerve. Vagotomy may be performed for research or for therapeutic purposes.
A condition caused by dysfunctions related to the SINOATRIAL NODE including impulse generation (CARDIAC SINUS ARREST) and impulse conduction (SINOATRIAL EXIT BLOCK). It is characterized by persistent BRADYCARDIA, chronic ATRIAL FIBRILLATION, and failure to resume sinus rhythm following CARDIOVERSION. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects.
A short vein that collects about two thirds of the venous blood from the MYOCARDIUM and drains into the RIGHT ATRIUM. Coronary sinus, normally located between the LEFT ATRIUM and LEFT VENTRICLE on the posterior surface of the heart, can serve as an anatomical reference for cardiac procedures.
Loss of consciousness due to a reduction in blood pressure that is associated with an increase in vagal tone and peripheral vasodilation.
The 10th cranial nerve. The vagus is a mixed nerve which contains somatic afferents (from skin in back of the ear and the external auditory meatus), visceral afferents (from the pharynx, larynx, thorax, and abdomen), parasympathetic efferents (to the thorax and abdomen), and efferents to striated muscle (of the larynx and pharynx).
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
Blood clot formation in any part of the CAROTID ARTERIES. This may produce CAROTID STENOSIS or occlusion of the vessel, leading to TRANSIENT ISCHEMIC ATTACK; CEREBRAL INFARCTION; or AMAUROSIS FUGAX.
Formation or presence of a blood clot (THROMBUS) in the CRANIAL SINUSES, large endothelium-lined venous channels situated within the SKULL. Intracranial sinuses, also called cranial venous sinuses, include the superior sagittal, cavernous, lateral, petrous sinuses, and many others. Cranial sinus thrombosis can lead to severe HEADACHE; SEIZURE; and other neurological defects.
The 9th cranial nerve. The glossopharyngeal nerve is a mixed motor and sensory nerve; it conveys somatic and autonomic efferents as well as general, special, and visceral afferents. Among the connections are motor fibers to the stylopharyngeus muscle, parasympathetic fibers to the parotid glands, general and taste afferents from the posterior third of the tongue, the nasopharynx, and the palate, and afferents from baroreceptors and CHEMORECEPTOR CELLS of the carotid sinus.
Damages to the CAROTID ARTERIES caused either by blunt force or penetrating trauma, such as CRANIOCEREBRAL TRAUMA; THORACIC INJURIES; and NECK INJURIES. Damaged carotid arteries can lead to CAROTID ARTERY THROMBOSIS; CAROTID-CAVERNOUS SINUS FISTULA; pseudoaneurysm formation; and INTERNAL CAROTID ARTERY DISSECTION. (From Am J Forensic Med Pathol 1997, 18:251; J Trauma 1994, 37:473)
A highly poisonous compound that is an inhibitor of many metabolic processes and is used as a test reagent for the function of chemoreceptors. It is also used in many industrial processes.
The numerous (6-12) small thin-walled spaces or air cells in the ETHMOID BONE located between the eyes. These air cells form an ethmoidal labyrinth.
The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801)
Benign paraganglioma at the bifurcation of the COMMON CAROTID ARTERIES. It can encroach on the parapharyngeal space and produce dysphagia, pain, and cranial nerve palsies.
Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.
A measurement of the thickness of the carotid artery walls. It is measured by B-mode ULTRASONOGRAPHY and is used as a surrogate marker for ATHEROSCLEROSIS.
The act of breathing with the LUNGS, consisting of INHALATION, or the taking into the lungs of the ambient air, and of EXHALATION, or the expelling of the modified air which contains more CARBON DIOXIDE than the air taken in (Blakiston's Gould Medical Dictionary, 4th ed.). This does not include tissue respiration (= OXYGEN CONSUMPTION) or cell respiration (= CELL RESPIRATION).
Neurons which send impulses peripherally to activate muscles or secretory cells.
Rhythmic compression of the heart by pressure applied manually over the sternum (closed heart massage) or directly to the heart through an opening in the chest wall (open heart massage). It is done to reinstate and maintain circulation. (Dorland, 28th ed)
The thoracolumbar division of the autonomic nervous system. Sympathetic preganglionic fibers originate in neurons of the intermediolateral column of the spinal cord and project to the paravertebral and prevertebral ganglia, which in turn project to target organs. The sympathetic nervous system mediates the body's response to stressful situations, i.e., the fight or flight reactions. It often acts reciprocally to the parasympathetic system.
The removal or interruption of some part of the autonomic nervous system for therapeutic or research purposes.
The force that opposes the flow of BLOOD through a vascular bed. It is equal to the difference in BLOOD PRESSURE across the vascular bed divided by the CARDIAC OUTPUT.
The motor nerve of the diaphragm. The phrenic nerve fibers originate in the cervical spinal column (mostly C4) and travel through the cervical plexus to the diaphragm.
Tumors or cancer of the PARANASAL SINUSES.
A synthetic mineralocorticoid with anti-inflammatory activity.
The innermost layer of an artery or vein, made up of one layer of endothelial cells and supported by an internal elastic lamina.
Surgical excision, performed under general anesthesia, of the atheromatous tunica intima of an artery. When reconstruction of an artery is performed as an endovascular procedure through a catheter, it is called ATHERECTOMY.
The middle layer of blood vessel walls, composed principally of thin, cylindrical, smooth muscle cells and elastic tissue. It accounts for the bulk of the wall of most arteries. The smooth muscle cells are arranged in circular layers around the vessel, and the thickness of the coat varies with the size of the vessel.
An abnormal response to a stimulus applied to the sensory components of the nervous system. This may take the form of increased, decreased, or absent reflexes.
A derivative of CHLORAL HYDRATE that was used as a sedative but has been replaced by safer and more effective drugs. Its most common use is as a general anesthetic in animal experiments.
Simple rapid heartbeats caused by rapid discharge of impulses from the SINOATRIAL NODE, usually between 100 and 180 beats/min in adults. It is characterized by a gradual onset and termination. Sinus tachycardia is common in infants, young children, and adults during strenuous physical activities.
The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of SYSTOLE and is heard as a "lubb" sound; the second is produced by the closing of the AORTIC VALVE and PULMONARY VALVE and is heard as a "dupp" sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the HEART ATRIA; and the fourth is produced by atrial contraction and ventricular filling.
Falls due to slipping or tripping which may result in injury.
A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).
A state characterized by loss of feeling or sensation. This depression of nerve function is usually the result of pharmacologic action and is induced to allow performance of surgery or other painful procedures.
Tumors or cancer of the MAXILLARY SINUS. They represent the majority of paranasal neoplasms.
The splitting of the vessel wall in one or both (left and right) internal carotid arteries (CAROTID ARTERY, INTERNAL). Interstitial hemorrhage into the media of the vessel wall can lead to occlusion of the internal carotid artery and aneurysm formation.
An imprecise term which may refer to a sense of spatial disorientation, motion of the environment, or lightheadedness.
The removal or interruption of some part of the sympathetic nervous system for therapeutic or research purposes.
The circulation in a portion of the body of one individual of blood supplied from another individual.
Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
A characteristic symptom complex.
A hair-containing cyst or sinus, occurring chiefly in the coccygeal region.
The part of a human or animal body connecting the HEAD to the rest of the body.
Radiography of the vascular system of the brain after injection of a contrast medium.
A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
Elements of limited time intervals, contributing to particular results or situations.
Relatively complete absence of oxygen in one or more tissues.
Use of electric potential or currents to elicit biological responses.
A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The two large endothelium-lined venous channels that begin at the internal occipital protuberance at the back and lower part of the CRANIUM and travels laterally and forward ending in the internal jugular vein (JUGULAR VEINS). One of the transverse sinuses, usually the right one, is the continuation of the SUPERIOR SAGITTAL SINUS. The other transverse sinus is the continuation of the straight sinus.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
Nerve structures through which impulses are conducted from a nerve center toward a peripheral site. Such impulses are conducted via efferent neurons (NEURONS, EFFERENT), such as MOTOR NEURONS, autonomic neurons, and hypophyseal neurons.
The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.
The movement of the BLOOD as it is pumped through the CARDIOVASCULAR SYSTEM.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
The main trunk of the systemic arteries.
Ultrasonography applying the Doppler effect combined with real-time imaging. The real-time image is created by rapid movement of the ultrasound beam. A powerful advantage of this technique is the ability to estimate the velocity of flow from the Doppler shift frequency.
The lower portion of the BRAIN STEM. It is inferior to the PONS and anterior to the CEREBELLUM. Medulla oblongata serves as a relay station between the brain and the spinal cord, and contains centers for regulating respiratory, vasomotor, cardiac, and reflex activities.
The long large endothelium-lined venous channel on the top outer surface of the brain. It receives blood from a vein in the nasal cavity, runs backwards, and gradually increases in size as blood drains from veins of the brain and the DURA MATER. Near the lower back of the CRANIUM, the superior sagittal sinus deviates to one side (usually the right) and continues on as one of the TRANSVERSE SINUSES.
The portion of the descending aorta proceeding from the arch of the aorta and extending to the DIAPHRAGM, eventually connecting to the ABDOMINAL AORTA.
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
The neural systems which act on VASCULAR SMOOTH MUSCLE to control blood vessel diameter. The major neural control is through the sympathetic nervous system.
Devices that provide support for tubular structures that are being anastomosed or for body cavities during skin grafting.
Absent or reduced sensitivity to cutaneous stimulation.
Abnormally low BLOOD PRESSURE that can result in inadequate blood flow to the brain and other vital organs. Common symptom is DIZZINESS but greater negative impacts on the body occur when there is prolonged depravation of oxygen and nutrients.
Loss of the ability to maintain awareness of self and environment combined with markedly reduced responsiveness to environmental stimuli. (From Adams et al., Principles of Neurology, 6th ed, pp344-5)
Brief reversible episodes of focal, nonconvulsive ischemic dysfunction of the brain having a duration of less than 24 hours, and usually less than one hour, caused by transient thrombotic or embolic blood vessel occlusion or stenosis. Events may be classified by arterial distribution, temporal pattern, or etiology (e.g., embolic vs. thrombotic). (From Adams et al., Principles of Neurology, 6th ed, pp814-6)
Interruption of sympathetic pathways, by local injection of an anesthetic agent, at any of four levels: peripheral nerve block, sympathetic ganglion block, extradural block, and subarachnoid block.
Neurons which conduct NERVE IMPULSES to the CENTRAL NERVOUS SYSTEM.
The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat).
Nerve structures through which impulses are conducted from a peripheral part toward a nerve center.
Treatment process involving the injection of fluid into an organ or tissue.
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
Cells specialized to transduce mechanical stimuli and relay that information centrally in the nervous system. Mechanoreceptor cells include the INNER EAR hair cells, which mediate hearing and balance, and the various somatosensory receptors, often with non-neural accessory structures.
A significant drop in BLOOD PRESSURE after assuming a standing position. Orthostatic hypotension is a finding, and defined as a 20-mm Hg decrease in systolic pressure or a 10-mm Hg decrease in diastolic pressure 3 minutes after the person has risen from supine to standing. Symptoms generally include DIZZINESS, blurred vision, and SYNCOPE.
The act of constricting.

Reduction in baroreflex cardiovascular responses due to venous infusion in the rabbit. (1/508)

We studied reflex bradycardia and depression of mean arterial blood pressure (MAP) during left aortic nerve (LAN) stimulation before and after volume infusion in the anesthetized rabbit. Step increases in mean right atrial pressure (MRAP) to 10 mm Hg did not result in a significant change in heart rate or MAP. After volume loading, responses to LAN stimulation were not as great and the degree of attenuation was propoetional to the level of increased MRAP. A change in responsiveness was observed after elevation of MRAP by only 1 mm Hg, corresponding to less than a 10% increase in average calculated blood volume. after an increase in MRAP of 10 mm Hg, peak responses were attenuated by 44% (heart rate) and 52% (MAP), and the initial slopes (rate of change) were reduced by 46% (heart rate) and 66% (MAP). Comparison of the responses after infusion with blood and dextran solutions indicated that hemodilution was an unlikely explanation for the attenuation of the reflex responses. Total arterial baroreceptor denervation (ABD) abolished the volume-related attenuation was still present following bilateral aortic nerve section or vagotomy. It thus appears that the carotid sinus responds to changes inblood volume and influences the reflex cardiovascular responses to afferent stimulation of the LAN. On the other hand, cardiopulmonary receptors subserved by vagal afferents do not appear to be involved.  (+info)

Quantification of baroreceptor influence on arterial pressure changes seen in primary angiotension-induced hypertension in dogs. (2/508)

We studied the role of the sino-aortic baroreceptors in the gradual development of hypertension induced by prolonged administration of small amounts of angiotensin II (A II) in intact dogs and dogs with denervated sino-aortic baroreceptors. Short-term 1-hour infusions of A II(1.0-100 ng/kg per min) showed that conscious denervated dogs had twice the pressor sensitivity of intact dogs. Long-term infusions of A II at 5.0 ng/kg per min (2-3 weeks) with continuous 24-hour recordings of arterial pressure showed that intact dogs required 28 hours to reach the same level of pressure attained by denervated dogs during the 1st hour of infusion. At the 28th hour the pressure in both groups was 70% of the maximum value attained by the 7th day of infusion. Both intact and denervated dogs reached nearly the same plateau level of pressure, the magnitude being directly related both the the A II infusion rate and the daily sodium intake. Cardiac output in intact dogs initially decreased after the onset of A II infusion, but by the 5th day of infusion it was 38% above control, whereas blood volume was unchanged. Heart rate returned to normal after a reduction during the 1st day of infusion in intact dogs. Plasma renin activity could not be detected after 24 hours of A II infusion in either intact or denervated dogs. The data indicate that about 35% of the hypertensive effect of A II results from its acute pressor action, and an additional 35% of the gradual increase in arterial pressure is in large measure a result of baroreceptor resetting. We conclude that the final 30% increase in pressure seems to result from increased cardiac output, the cause of which may be decreased vascular compliance. since the blood volume remains unaltered.  (+info)

Hypoxia inhibits baroreflex vagal bradycardia via a central action in anaesthetized rats. (3/508)

It is known that arterial baroreflexes are suppressed in stressful conditions. The present study was designed to determine whether and how hypoxia affects arterial baroreflexes, especially the heart rate component, baroreflex vagal bradycardia. In chloralose-urethane-anaesthetized rats, baroreflex vagal bradycardia was evoked by electrical stimulation of the aortic depressor nerve, and the effect of 15 s inhalation of hypoxic gas (4% O2) was studied. Inhalation of hypoxic gas was found to inhibit baroreflex vagal bradycardia. The inhibition persisted after bilateral transection of the carotid sinus nerve. Cervical vagus nerves were cut bilaterally and their peripheral cut ends were stimulated to provoke vagal bradycardia of peripheral origin so as to determine whether hypoxia could inhibit vagal bradycardia by acting on a peripheral site. In contrast to baroreflex vagal bradycardia, the vagus-induced bradycardia was not affected by hypoxic gas inhalation. It is concluded that baroreflex vagal bradycardia is inhibited by hypoxia and the inhibition is largely mediated by its direct central action.  (+info)

Responses of abdominal vascular capacitance in the anaesthetized dog to changes in carotid sinus pressure. (4/508)

1. The abdominal circulation of anaesthetized dogs was vascularly isolated without opening the abdomen, by cutting or tying all structures immediately above the diaphragm and tying the proximal ends of the hind limbs. The region was perfused at constant flow through the aorta and drained at constant pressure from the inferior vena cava. 2. Vascular resistance responses were expressed as the changes in perfusion pressure and capacitance responses were determined by integrating changes in vena caval outflow. 3. Decreasing the pressure in the isolated carotid sinuses over the whole baroreceptor sensitivity range increased mean perfusion pressure from 91 to 149 mmHg (a 67% increase in resistance) and decreased mean capacitance by 111 ml. (5 ml. kg-1). 4. The range of carotid sinus pressures over which capacitance responses occurred was at a significantly higher level than the corresponding range for resistance responses. 5. Comparison of the reflex responses with the responses to direct stimulation of efferent sympathetic nerves shows that quantitatively similar responses of resistance and capacitance to those induced by a large step decrease in carotid pressure could be produced by stimulating maximally the efferent sympathetic nerves at 5 Hz. These results also suggest that at all levels of carotid sinus pressure there is no difference in the impulse traffic to resistance and capacitance vessels.  (+info)

Carotid sinus hypersensitivity--a modifiable risk factor for fractured neck of femur. (5/508)

BACKGROUND: the potential impact on morbidity, mortality and health care economics makes it important to identify patients at risk of fracture, in particular fractured neck of femur (FNOF). Older patients with carotid sinus hypersensitivity (CSH) are more likely to have unexplained falls and to experience fractures, particularly FNOF. Our objective was to determine the prevalence of CSH in patients with FNOF. DESIGN: case-controlled prospective series. METHODS: consecutive cases were admissions over 65 years with FNOF. Controls were consecutive patients admitted for elective hip surgery, frail elderly people admitted to hospital medical wards and day-hospital patients. All patients had a clinical assessment of cognitive function, physical abilities and history of previous syncope, falls and dizziness, in addition to repeated carotid sinus massage with continuous heart rate and phasic blood pressure measurement. RESULTS: heart rate slowing and fall in systolic blood pressure was greater for patients with FNOF than those admitted for elective hip surgery (P < 0.05 and P < 0.001). CSH was present in 36% of the FNOF group, none of the elective surgery group, 13% of the acutely ill controls and 17% of the outpatients. It was more likely to be present in FNOF patients with a previous history of unexplained falls or an unexplained fall causing the index fracture. The heart rate and systolic blood pressure responses to carotid sinus stimulation were reproducible. CONCLUSION: older patients with an acute neck of femur fracture who do not give a clear history of an accidental fall or who have had previously unexplained falls are likely to have CSH. CSH may be a modifiable risk factor for older patients at risk of hip fracture.  (+info)

New analytic framework for understanding sympathetic baroreflex control of arterial pressure. (6/508)

The sympathetic baroreflex is an important feedback system in stabilization of arterial pressure. This system can be decomposed into the controlling element (mechanoneural arc) and the controlled element (neuromechanical arc). We hypothesized that the intersection of the two operational curves representing their respective functions on an equilibrium diagram should define the operating point of the arterial baroreflex. Both carotid sinuses were isolated in 16 halothane-anesthetized rats. The vagi and aortic depressor nerves were cut bilaterally. Carotid sinus pressure (CSP) was sequentially altered in 10-mmHg increments from 80 to 160 mmHg while sympathetic efferent nerve activity (SNA) and systemic arterial pressure (SAP) were recorded simultaneously under various hemorrhagic conditions. The mechanoneural arc was characterized by the response of SNA to CSP and the neuromechanical arc by the response of SAP to SNA. We parametrically analyzed the relationship between input and output for each arc using a four-parameter logistic equation model. In baseline states, the two arcs intersected each other at the point at which the instantaneous gain of each arc attained its maximum. Severe hemorrhage lowered the gain and offset of the neuromechanical arc and moved the operating point, whereas the mechanoneural arc remained unchanged. The operating points measured under the closed-loop conditions were indistinguishable from those estimated from the intersections of the two arc curves on the equilibrium diagram. The average root mean square errors of estimate for arterial pressure and SNA were 2 and 3%, respectively. Such an analytic approach could explain a mechanism for the determination of the operating point of the sympathetic baroreflex system and thus helps us integratively understand its function.  (+info)

Carotid baroreflex function during prolonged exercise. (7/508)

The present investigation was designed to uncouple the hemodynamic physiological effects of thermoregulation from the effects of a progressively increasing central command activation during prolonged exercise. Subjects performed two 1-h bouts of leg cycling exercise with 1) no intervention and 2) continuous infusion of a dextran solution to maintain central venous pressure constant at the 10-min pressure. Volume infusion resulted in a significant reduction in the decrement in mean arterial pressure seen in the control exercise bout (6.7 +/- 1.8 vs. 11.6+/- 1.3 mmHg, respectively). However, indexes of central command such as heart rate and ratings of perceived exertion rose to a similar extent during both exercise conditions. In addition, the carotid-cardiac baroreflex stimulus-response relationship, as measured by using the neck pressure-neck suction technique, was reset from rest to 10 min of exercise and was further reset from 10 to 50 min of exercise in both exercise conditions, with the operating point being shifted toward the reflex threshold. We conclude that the progressive resetting of the carotid baroreflex and the shift of the reflex operating point render the carotid-cardiac reflex ineffectual in counteracting the continued decrement in mean arterial pressure that occurs during the prolonged exercise.  (+info)

Chronic hypoxia enhances the phrenic nerve response to arterial chemoreceptor stimulation in anesthetized rats. (8/508)

Chronic exposure to hypoxia results in a time-dependent increase in ventilation called ventilatory acclimatization to hypoxia. Increased O(2) sensitivity of arterial chemoreceptors contributes to ventilatory acclimatization to hypoxia, but other mechanisms have also been hypothesized. We designed this experiment to determine whether central nervous system processing of peripheral chemoreceptor input is affected by chronic hypoxic exposure. The carotid sinus nerve was stimulated supramaximally at different frequencies (0.5-20 Hz, 0.2-ms duration) during recording of phrenic nerve activity in two groups of anesthetized, ventilated, vagotomized rats. In the chronically hypoxic group (7 days at 80 Torr inspired PO(2)), phrenic burst frequency (f(R), bursts/min) was significantly higher than in the normoxic control group with carotid sinus nerve stimulation frequencies >5 Hz. In the chronically hypoxic group, peak amplitude of integrated phrenic nerve activity ( integral Phr, percent baseline) or change in integral Phr was significantly greater at stimulation frequencies between 5 and 17 Hz, and minute phrenic activity ( integral Phr x f(R)) was significantly greater at stimulation frequencies >5 Hz. These experiments show that chronic hypoxia facilitates the translation of arterial chemoreceptor afferent input to ventilatory efferent output through a mechanism in the central nervous system.  (+info)

Carotid sinus reflex interactions were studied in 10 dogs anesthetized with pentobarbital sodium. The right and left carotid sinus regions were isolated and perfused at controlled pressures. Pressure in the right and left carotid sinuses were independently varied, and the resulting steady-state reflex changes in arterial pressure, heart rate, respiratory frequency, tidal volume, and total ventilation were measured. Reflex changes when carotid sinus pressure was changed on one side were strongly influenced by pressure in the contralateral carotid sinus (P less than 0.05). Right carotid sinus gain was found to be 0.628 +/- 0.058 at a left carotid sinus pressure of 50 mmHg and 0.148 +/- 0.027 when left carotid sinus pressure was 200 mmHg. Similar results were found for left carotid sinus gain. Suppression was also found for heart rate, respiratory rate, tidal volume, and total ventilation. The hypothesis that rapid resetting of one carotid sinus baroreflex might influence responses from the other ...
TY - JOUR. T1 - Aortic depressor nerve stimulation does not impede the dynamic characteristics of the carotid sinus baroreflex in normotensive or spontaneously hypertensive rats. AU - Kawada, Toru. AU - Turner, Michael J.. AU - Shimizu, Shuji. AU - Fukumitsu, Masafumi. AU - Kamiya, Atsunori. AU - Sugimachi, Masaru. PY - 2017/5/30. Y1 - 2017/5/30. N2 - Recent clinical trials in patients with drug-resistant hypertension indicate that electrical activation of the carotid sinus baroreflex (baroreflex activation therapy) can reduce arterial pressure (AP) for more than a year. To examine whether the electrical stimulation from one baroreflex system impedes normal short-term AP regulation via another unstimulated baroreflex system, we electrically stimulated the left aortic depressor nerve (ADN) while estimating the dynamic characteristics of the carotid sinus baroreflex in anesthetized normotensive Wistar-Kyoto (WKY, n=8) rats and spontaneously hypertensive rats (SHR, n=7). Isolated carotid sinus ...
Synonyms for Carotid sinus reflex in Free Thesaurus. Antonyms for Carotid sinus reflex. 26 synonyms for reflex: automatic, spontaneous, instinctive, involuntary, impulsive, knee-jerk, unthinking, automatic, impulsive, instinctive, involuntary.... What are synonyms for Carotid sinus reflex?
The carotid sinus baroreceptor reflex was studied in 11 normotensive subjects, using a variable pressure neck chamber and correcting for imperfect pressure transmission to the carotid sinus. Decreased carotid baroreceptor stimulation caused a sustaineded rise in arterial pressure, and increased carotid baroreceptor stimulation caused a sustain fall. The responses were in linear relation to the stimulus, and, after reaching the steady state, greater for the reduced than for the increased baroreceptor stimulation. Thus the carotid sinus baroreceptor reflex of the normotensive man is an effective antihypotensive and antihypertensive feedback system, though the former function may have more sensitivity. The increased and decreased baroreceptor stimulation by the neck chamber also caused bradycardia and tachycardia which were modest in magnitude and often transient. In eight subjects the reflex changes in heart rate induced by the neck chamber were compared with those induced by altering transmural ...
In human anatomy, the carotid sinus is a dilated area at the base of the internal carotid artery just superior to the bifurcation of the internal carotid and external carotid at the level of the superior border of thyroid cartilage. The carotid sinus extends from the bifurcation to the true internal carotid artery. The carotid sinus is sensitive to pressure changes in the arterial blood at this level. It is the major baroreception site in humans and most mammals. The carotid sinus is the reflex area of the carotid artery, consisting of various nerve receptors for baroregulation (pressure regulation of the body in sync to external conditions). The carotid sinus contains numerous baroreceptors which function as a sampling area for many homeostatic mechanisms for maintaining blood pressure. The carotid sinus baroreceptors are innervated by the sinus nerve of Hering, which is a branch of cranial nerve IX (glossopharyngeal nerve). The glossopharyngeal nerve synapses in the nucleus tractus ...
The major new finding obtained from conscious rats was the clear-cut demonstration that chemoreceptors, as well as baroreceptors, were transiently activated during combined electric stimulation of the carotid sinus and the carotid sinus nerve in conscious rats. The results have shown that when the carotid bifurcation was intact (ie, in the CONT group), combined electric stimulation of the carotid sinus and the carotid sinus nerve elicited a significant hypotensive response. This finding is in line with results obtained in dogs21,22 and drug-resistant hypertensive patients.1,2 Nevertheless, unlike the results seen in dogs23 and drug-resistant hypertensive patients,4 HR did not significantly decrease in intact conscious rats (the CONT group).. It is of interest to note that bilateral carotid body denervation (as in the CHEMO-X group) hampered the hemodynamic influences of the carotid chemoreceptors during combined electric stimulation of the carotid sinus and the carotid sinus nerve in conscious ...
Objective: To determine the frequency, age distribution and clinical presentation of carotid sinus hypersensitivity (CSH) among 373 patients (age range 15-92 years) referred to two autonomic referral centres during a 10-year period.. Methods: Carotid sinus massage (CSM) was performed both supine and during 60° head-up tilt. Beat-to-beat blood pressure, heart rate and a three-lead electrocardiography were recorded continuously. CSH was classified as cardioinhibitory (asystole ⩾3 s), vasodepressor (systolic blood pressure fall ⩾50 mm Hg) or mixed. All patients additionally underwent autonomic screening tests for orthostatic hypotension and autonomic failure.. Results: CSH was observed in 13.7% of all patients. The diagnostic yield of CSM was nil in patients aged ,50 years (n = 65), 2.4% in those aged 50-59 years (n = 82), 9.1% in those aged 60-69 years (n = 77), 20.7% in those aged 70-79 years (n = 92) and reached 40.4% in those ,80 years (n = 57). Syncope was the leading clinical symptom in ...
Neurological complications following carotid sinus massage for diagnosis of the carotid sinus syndrome are uncommon and usually transient. Contraindications to carotid sinus massage should be respected and the standardized technique used.
The goal of this study was to determine whether nitric oxide (NO) and the NO donor, S-nitrosocysteine (cysNO), modulate the activity of carotid sinus baroreceptors. Baroreceptor activity was recorded from the vascularly isolated carotid sinus in anesthetized rabbits. Baroreceptor activity decreased in a dose-dependent manner after injection of either NO or cysNO as constant pressure was maintained, and activity recovered spontaneously over time, within seconds to minutes. The baroreceptor pressure-activity relation was shifted significantly to the right by cysNO, with a profound suppression of activity at high pressure. Baroreceptor activity at 160 mm Hg averaged 76 +/- 8%, 60 +/- 6%, and 36 +/- 5% of the control maximum during exposure to 10(-4), 2 to 3 x 10(-4), and 10(-3) mol/L cysNO, respectively. The inhibition of activity by the L and D isomers of cysNO was equivalent and was blocked by reduced hemoglobin, suggesting that the effect was mediated by NO. The suppression of baroreceptor activity by
Introduction: White matter hyperintensities (WMH) on MRI are common in older people and are associated with cognitive impairment, falls and depression. They are believed to represent cerebrovascular small vessel disease but as frank infarction is not always seen it is suggested that WMH represent damage resulting from hypoperfusion. Carotid sinus hypersensitivity (CSH) is an exaggerated fall in blood pressure (BP) or heart rate (HR) in response to stimulation of the carotid sinus. It is defined as a ≥50 mmHg drop in systolic BP & / or ≥3 second asystole in response to carotid sinus massage (CSM). CSH, is often associated with syncope & presyncope, thought to indicate cerebral hypoperfusion.. Aim: To examine, over a ten year follow-up, if CSH is associated with WMH volume.. Method: In 2002, 274 people age ≥65 underwent CSM. BP & HR response were recorded using beat to beat monitoring. Symptoms suggestive of cerebral hypoperfusion e.g. syncope or presyncope were recorded. In 2012, 53 of ...
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TY - JOUR. T1 - Medullary projections of rabbit carotid sinus nerve. AU - Blessing, W. W.. AU - Yu, Y. H.. AU - Nalivaiko, E.. PY - 1999/1/23. Y1 - 1999/1/23. N2 - In New Zealand white rabbits, cholera-toxin HRP was injected into the carotid sinus nerve just proximal to the carotid sinus. After survival periods of 3-5 days the rabbits were anesthetized and the brain fixed with aldehyde solution. Transverse sections were cut on a sledge microtome and the sections reacted with the tetramethylbenzidine procedure. HRP-positive fibers entered the ipsilateral dorsolateral medulla at the level of the acoustic tubercle, joining the tractus Solitarius. Positive fibres were found principally ipsilaterally in four regions of the medulla: in the caudal two thirds of the nucleus tractus solitarius, in its dorsolateral regions and, more caudally, in its commissural subdivision; in the dorsolateral aspect of the spinal nucleus of the trigeminal nerve; in the region ventral and ventrolateral to the tractus ...
1. Carotid baroreceptor manipulation (neckchamber technique) and passive head-up tilting were used in ten patients with renovascular hypertension and in five subjects with essential hypertension under diuretic treatment to study reflex control of renin secretion at high basal-renin production rates.. 2. Reflex effects of carotid baroreceptor manipulation on renin secretion were only minor. During baroreceptor deactivation there was a moderate increase in mean arterial pressure, but an inconsistent change in the renal venous-arterial difference in plasma renin activity (PRA).. 3. During baroreceptor stimulation there was a modest fall in mean arterial pressure and a marked rise in the renal venous-arterial difference in PRA. This was opposite to the fall which might have been predicted as a result of the sympathetic depressor influence of the baroreceptor stimulus. Conversely, tilting increased the venous-arterial PRA difference by about 200%.. 4. It is concluded that when renin production rate ...
The purpose of this study was to examine the role of carotid sinus and cardiopulmonary mechanoreceptors in the reflex control of adrenal medullary catecholamine secretion. Afferent input from carotid sinus and cardiopulmonary mechanoreceptors was decreased by carotid occlusion or cervical vagal cold block, respectively. Increases in arterial pressure were significantly greater when either intervention was tested in the presence of the other, with the role of the carotid sinus baroreflex being dominant. Neither carotid occlusion nor vagal cold block resulted in a significant increase in plasma epinephrine or norepinephrine concentrations. However, carotid occlusion during vagal block caused a significant increase in plasma epinephrine (+87%) and norepinephrine concentrations (+128%). Likewise, vagal block during carotid occlusion increased plasma epinephrine (+82%) and norepinephrine concentrations (+73%). Similar experiments performed in a group of chemically sympathectomized animals ...
The goal of the present study was to determine whether oxygen-derived free radicals contribute to baroreceptor dysfunction in atherosclerosis. Baroreceptor activity was measured from the carotid sinus nerve during pressure ramps in isolated carotid sinuses of anesthetized rabbits. Rabbits fed a 0.5% to 1.0% cholesterol diet for 7.9 +/- 0.4 months (mean +/- SE; range, 5.5 to 10) developed atherosclerotic lesions in the carotid sinuses. Maximum baroreceptor activity measured at 140 mm Hg and the slope of the pressure-activity curve were reduced in atherosclerotic (n = 15) compared with normal (n = 13) rabbits (425 +/- 34 versus 721 +/- 30 spikes per second and 6.2 +/- 0.6 versus 10.8 +/- 0.8 spikes per second per mm Hg, respectively, P | .05). The level of activity was inversely related to plasma cholesterol concentration (r = .86, P | .001) and total cholesterol load (plasma concentration x duration of diet, r = .92). Mean arterial pressure was normal in both groups. Exposure of the carotid sinus to the
Title:The Future of Interventional Management of Hypertension: Threats and Opportunities. VOLUME: 12 ISSUE: 1. Author(s):Alexandros Briasoulis and George Bakris. Affiliation:5841 S. Maryland Ave MC 1027, Chicago, IL 60637, USA.. Keywords:Resistant hypertension, baroreflex activation therapy, renal sympathetic denervation.. Abstract:In about 48% hypertensive patients in the United States, blood pressure remains higher than accepted treatment targets despite broad availability of effective pharmaceutical agents. Of these 48%, recent estimates define about 10-11% have treatment-resistant hypertension (TR-HTN). Compensatory changes in sympathetic nervous system function are an important component of HTN. Recent technical advances targeting the sympathetic activity of the carotid sinuses (Baroreflex Activation Therapy-BAT) and the renal sympathetic nerves (Renal Denervation Therapy-RDT) have renewed interest in invasive therapy for the treatment of drug-resistant hypertension. Encouraging results ...
The use of baroreflex stimulation devices (also known as baroreflex activation therapy) is a potential alternative treatment for resistant hypertension and heart failure. Both hypertension and heart failure are relatively common conditions and are initially treated with medications and lifestyle changes. A substantial portion of patients are unresponsive to conventional therapy and treating these patients is often challenging and can lead to high costs and adverse effects. As a result, there is a large unmet need for additional treatments.. New treatment options are being explored to treat drug-resistant hypertension. One such approach is the electrical activation of the carotid sinus baroreflex. Baroreceptors are pressure sensors contained within the walls of the carotid arteries. They are part of the autonomic nervous system that regulates basic physiologic functions such as heart rate and blood pressure (BP). When these receptors are stretched, as occurs with increases in BP, the baroreflex ...
The hypothesis that we have formulated to explain the relationship between denervation and abnormal response to carotid sinus massage has been extensively described6 and is based on the theory of central gating.14 Briefly, chronic denervation of the muscle leaves the central nervous system without any moment-to-moment information about the contractile state of the muscle. On the other hand, the midbrain centers receive normal information from the stretch receptors of the carotid sinus. In a normal individual, carotid sinus massage, because of the anatomic position of the sternocleidomastoid muscle, results in a pressure on both the muscle and the sinus, and these signals are integrated by the centers as an external stretching of the sinus. In the case of proprioceptive defect of the muscle, the massage of the sinus is considered as a stretching of the sinus only and is integrated by the centers as an abrupt increase in blood pressure, resulting through the baroreflex pathways in an ...
An implantable device (20) uses the carotid baroreflex in order to control systemic blood pressure. The implant includes sampling and pulse stimulation electrodes (44) preferably located on the carotid sinus nerve branch of the glossopharyngeal nerve, adjacent and distal to the carotid sinus baroreceptors. The stimulators have an external control unit, which communicates with the implant for determining appropriate operational parameters, and for retrieving telemetry information from the devices data bank. Typically two internal devices are implanted, one at each side of the patients neck.
A quick reference on Carotid sinus syncope, covering the clinical presentation, investigative approach, and key principles of management
There are four main sinus cavities in the body. They are located on either side of the nose, behind and in-between the eyes, and in the forehead. Each sinus cavity has an opening into the nose for the exchange of air and mucous. When the cavities get filled with mucous it creates a perfect breeding ground for bacteria.. Some of the most common sinus pressure symptoms include severe nasal congestion and yellowish green discharge which is thick because it contains pus. Pain in the teeth is also very normal. This pain increases when you bend over. Symptoms may vary however, depending on the sinuses involved.. Sinus pressure symptoms normally occur for about ten days and they may carry on for a longer period if a cold or flu occurs. They normally worsen after five to seven days. In some cases fever also occurs. Fever is more common in children than in adults therefore it is not a very reliable way of diagnosing sinus pressure.. Far more severe sinus pressure symptoms are terrible headaches, pain or ...
The present experiments were designed to measure the direct effects of propranolol on carotid sinus pressoreceptor nerve activity in the semi-isolated, superfused sinus of the cat. Propranolol (5 microgram/ml) significantly enhanced carotid sinus nerve activity at perfusion pressures of 100, 150 and 250 mm Hg. The enhancement was due primarily to the recruitment of new fibers. In similar preparations, perfused at constant flow, propranolol increased sinus resistance in parallel with the increase in sinus discharge. These effects were rapidly dissipated by rinsing with drug-free perfusion solution. The evidence suggests that propranolol may produce a change in either the elastic or autoregulatory modalities of sinus smooth muscle. This may produce a functional resetting of the sinus and provide a mechanism to explain the antihypertensive effect of propranolol. ...
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Why is the Dim Mak effective? The carotid sinus is a special sensory organ regulating the pressure of blood flow to the brain. The carotid sinus is located over internal and external carotid arteries. When blood pressure is too high, the carotid sinus signals the vasomotor center of the brain to decrease the blood pressure by dilating peripheral blood vessels and slowing down heart rate. Thats why it can result in a loss of consciousness along with a build up of plaques in the carotid arteries. By striking this area, small tears can result in the carotid arteries and blood clots. Death can occur by striking this area. Thats why doctors look for a pulse because the carotid artery is a major indicator of life. A very helpful resource in understanding more on Dim Mak is Dr. Michael Kellys (a sports medical doctor) book Death Touch: The Science of Dim Mak (1). In this book, he explains that stimulating a nerve through a Dim Mak point connected to an internal organ can cause damage ...
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The results from these studies demonstrate that afferent input from peripheral chemoreceptors and mechanoreceptors contributes little to the systemic hemodynamic and sympathetic responses after term delivery by cesarean section. Furthermore, birth-related increases in circulating norepinephrine but not epinephrine appear dependent on afferent input from the carotid sinus or aortic depressor nerves, which carry both chemo- and baroreceptor afferents from the carotid sinus and aortic arch, respectively. Finally, we observed that vagal afferent activity regulates basal fetal plasma ANG II levels and exerts a tonic inhibitory effect on AVP release after birth.. Both peripheral chemoreceptors and baroreceptors have been shown to be functional during fetal life. The fetal cardiovascular response to acute hypoxemia is well described, consisting of a decrease in heart rate and increase in peripheral vascular resistance (7). Carotid denervation abolishes these responses to hypoxemia and NaCN, a chemical ...
For the past week I have been fighting off what I thought was a sinus infection (sinus pressure, drainage, plugged up ears, headache, and an off/on fever). Starting about two or three days ago the fev...
Ways to relieve sinus pressure in the ears include nasal irrigation, drinking water, turmeric tea, and peppermint tea. Apply warm compress and inhale steam.
Why do you have a Spine?. You have a spine to connect the upper and lower portions of your body together. Through your spine runs your spinal cord which is the major thoroughfare between your brain and the rest of your body. Your spine is one of the most important aspects of your whole body.. What does your spine look like?. Your spine is made up of three main curves and the sacrum. There are twenty four vertebrae; 7 cervical, 12 thoracic, and 5 lumbar. The cervical are curved in a what is called a lordotic curve, the thoracic are curved the opposite direction or, kyphotic, and the lumbar are curved like the cervical, in a lordotic curve. A kyphotic curve is the primary curve and the lordotic curve is a secondary, or functional curve. A functional curve is one that does not show up until movement occurs.. The curves of your spine not only act as shock absorbers between your head and tail, but allow the head to be over your pelvis. Your spine allows you to stand upright and see the horizon! The ...
Alas! All is not a bed of roses in the world of cone beam imaging. With the improved technologies come increased responsibilities. A dentist might use his cone beam image for the reasons specific to his specialty, such as assessment for the adequacy of bone for implant placement, but if he or she does not recognize abnormal anatomical structures, he or she could be held legally responsible if the patient suffers future injuries relating to that missed observation. For example, if an adenocarcinoma has caused visible distortion or disintegration of any bony structure seen in the scan, the dentist is responsible for notifying the patient and referring the patient to an appropriate specialist, or baring that, for enlisting the help of a board certified radiologist to assess the images.. This also means that if the image includes the entire sinus region, the dentist is responsible for recognizing abnormalities in the sinus, even though this lies outside of his area of expertise and he has no ...
Breathe freely again by clearing blocked passageways and easing sinus pressure. According to research or other evidence, the following self-care steps may be helpful. Wipe out irritantsKeep your environment free of irritants and allergens that can trigger sinus congestion, such as dust, mold, smoke, chemical fumes, and...
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Looking for online definition of carotid sinus reflex in the Medical Dictionary? carotid sinus reflex explanation free. What is carotid sinus reflex? Meaning of carotid sinus reflex medical term. What does carotid sinus reflex mean?
Looking for online definition of carotid sinus in the Medical Dictionary? carotid sinus explanation free. What is carotid sinus? Meaning of carotid sinus medical term. What does carotid sinus mean?
TY - JOUR. T1 - Carotid baroreceptor function in dogs with chronic norepinephrine infusion. AU - Wang, Jie. AU - Ochoa, Manuel. AU - Patel, Mrugesh B.. AU - Zucker, Irving H.. AU - Loud, Alden V.. AU - Zeballos, Guillermo A.. AU - Hintze, Thomas H.. PY - 1991/6. Y1 - 1991/6. N2 - Carotid baroreceptor function, the compliance of the carotid sinus wall, and the structure of the carotid artery were examined in dogs with elevated plasma norepinephrine (2, 000-4, 000 pg/ml) for 28 days. The dogs with high nonepinephrine were normotensive (100±4.0 versus 98±4.0 mm Hg; p,0.05) with bradycardia (65 ±4.0 versus 87 ±16 beats/m in; p,0.05) compared with normal dogs in the conscious state. However, after pentobarbital anesthesia blood pressure was significantly higher in dogs with chronic norepinephrine infusion (165±6 mm Hg) compared with normal dogs (132±6 mm Hg). To assess baroreceptor sensitivity, multiunit carotid baroreceptor activity was recorded from the right carotid sinus nerve, and the ...
Clinical trials on carotid receptor stimulation by an implantable device showed a significant reduction in both office systolic (22 or 34 mmHg) and diastolic (18 or 20 mmHg) blood pressure, 24-hour ambulatory blood pressure (14/9 mmHg), and heart rate (12 bpm), which was evident from study onset and was maintained at follow-up. Available data suggest a beneficial effect of carotid baroreceptor stimulation on the reversal of left ventricular hypertrophy and cardiac structure and function, with attenuated mitral A-valve velocity and reduced left atrial dimensions; also carotid baropacing does not impair the renal function of patients with resistant hypertension, even during prolonged follow-up periods (13-18).. ...
TY - JOUR. T1 - Baroreceptor function is preserved following field stimulation of carotid baroreceptors in normotensive and hypertensive rats. AU - Kouchaki, Z.. AU - Butlin, M.. AU - Georgakopoulos, D.. AU - Avolio, A. P.. PY - 2015/5. Y1 - 2015/5. N2 - Background: Field stimulation of the carotid baroreceptors has been used successfully to induce long-term reduction in blood pressure. However, whether baroreceptor stimulation may affect the short-term blood pressure regulation function of the baroreceptors in normotensive and hypertensive conditions is not well established. Aim: To determine the effect of field stimulation of carotid baroreceptors on blood pressure in normotensive and hypertensive rats. Methods: Male Wistar Kyoto (WKY, n=7) and spontaneously hypertensive rats (SHR, n=7), each 15-19 weeks old, were anesthetized (urethane, 1.3 g/kg) and unilaterally vagotomized. Thoracic and aortic pressure was measured by an intravascular dual catheter tip pressure sensor (Science, 1.6F). ...
Arterial baroreceptors are mechanical sensors that detect blood pressure changes. It has long been suggested that the two arterial baroreceptors, aortic and carotid baroreceptors, have different pressure sensitivities. However, there is no consensus as to which of the arterial baroreceptors are more sensitive to changes in blood pressure. In the present study, we employed independent methods to compare the pressure sensitivity of the two arterial baroreceptors. Firstly, pressure-activated action potential firing was measured by whole-cell current clamp with a high-speed pressure clamp system in primary cultured baroreceptor neurons. The results show that aortic depressor neurons possessed a higher percentage of mechano-sensitive neurons. Furthermore, aortic baroreceptor neurons show a lower pressure threshold than that of carotid baroreceptor neurons. Secondly, uniaxial stretching of baroreceptor neurons, that mimics the forces exerted on blood vessels, elicited a larger increase in intracellular Ca2+
1. The carotid baroreceptors were stimulated for 2 min by neck suction at −30 and −60 mmHg in 19 normotensive subjects and 12 patients with moderate essential hypertension.. 2. Blood pressure was measured with a mercury sphygmomanometer and heart rate was derived from beat-to-beat analysis of the electrocardiogram. Blood flow was measured simultaneously at calf and finger with venous occlusion plethysmography and the vascular resistance was calculated.. 3. During neck suction at − 30 and − 60 mmHg there was a significant decrease in arterial blood pressure and heart rate. There was a transient vasodilatation of the calf blood vessels, while there was a sustained vasoconstriction of the finger blood vessels. These results were qualitatively similar in both groups; however, there were quantitative differences.. 4. These experiments show that there is a selective autonomic control of the different peripheral vascular beds by the carotid baroreceptors in both normotension and mild essential ...
1. Tachyphylaxis occurs when renin is repeatedly injected into dogs and cats regardless of whether they are normal, anesthetized, pithed, hepatectomized, suprarenalectomized, nephrectomized, or eviscerated.. 2. The pressor response to renin in brief experiments is independent of the height of the arterial pressure or the presence of the suprarenals. Evisceration and large doses of ergotamine reduce the response. It is largely uninfluenced by pithing, intracisternal injection of renin, cocaine, strychnine, caffeine, and infusion of sodium bicarbonate or hydrochloric acid. It may be slightly increased by large blood transfusions or hepatectomy but the result is short lived.. 3. There is no parallelism between the pressor responses to carotid sinus stimulation, adrenine, and tyramine on the one hand and renin on the other.. 4. Section of the brain may be followed by depressor responses to renin.. 5. Intracisternal injection of renin elicits no significant rise in blood pressure or other circulatory ...
The sick sinus syndrome is a disease of the sinus node and occurs in middle-aged and older patients, with some exceptions. The most probable predominant etiology is a degenerative process of the...
1. There are baroreceptors (pressure receptors) in the neck near the carotid artery. Activation of these receptors activates vagal tone. Increased vagal tone results in lowered heart rate, and in some people can cause fainting. So you might artificially (or more quickly) lower your HR, and if youre in the minority of people with carotid sinus hypersensitivity you might pass out. Falling and cracking your head is not conducive to what youre trying to achieve with PT. Plus its damned embarrassing ...
Adrenergic blocking action has been measured in a series of eighteen dibenzazepine derivatives. Maximal action was found in the allyl dibenzazepine derivative, Ro 2-3248. Compounds with side-chains longer than propyl were inactive. The quaternary salts were inactive.. The allyl dibenzazepine derivative, Ro 2-3248, is a strong, short-acting adrenergic blocking agent which causes a prolonged fall of blood pressure. It is orally active. Ro 2-3248 blocked the stimulatory action of epinephrine on blood pressure, nictitating membrane and isolated seminal vesicles. It blocked the stimulatory effects of arterenol. It also blocked the effects of sympathetic nerve stimulation on the nictitating membrane and the carotid sinus reflex. It did not block the inhibitory actions of epinephrine on blood pressure, isolated tracheal rings and isolated intestine or the inhibitory action of isopropylarterenol on blood pressure. The compound has a relatively low toxicity.. ...
Multidisciplinary assessment of the reason for the fall will reduce the risk of further fractures, and the components of such assessments are well described.11 12 Nearly all patients with hip fracture meet the criteria for such an assessment, which should be performed routinely as part of inpatient rehabilitation care (box 4). A medical cause for the fall should be sought; specifically, hypotension, postural hypotension, arrhythmia, vasovagal syncope, and carotid sinus hypersensitivity. Examination should include lying and standing blood pressure and a 12 lead electrocardiogram.. About 3% of hip fractures are related to localised bone weakness at the fracture site, secondary to tumour, bone cysts, or Pagets disease. More than half of the remaining patients have osteoporosis, and nearly all are osteopenic. Over the age of 80, a woman with normal bone mineral density for her age will have a T score of around - 2.5 (the diagnostic threshold for osteoporosis). Thus, assessment of bone density is ...
Systems and methods provide baroreflex activation to treat or reduce pain and/or to cause or enhance sedation or sleep. Methods involve activating the baroreflex system to provide pain reduction, sedation, improved sleep or some combination thereof. Systems include at least one baroreflex activation device, at least one sensor for sensing physiological activity of the patient, and a processor coupled with the baroreflex activation device(s) and the sensor(s) for processing sensed data received from the sensor and for activating the baroreflex activation device. In some embodiments, the system is fully implantable within a patient, such as in an intravascular, extravascular or intramural location.
The carotid body is located at the bifurcation of the common carotid artery (C4) and consists of chemoreceptors, partially derived from neural crest cells, which are capable of detecting partial pressure of oxygen and pH.. The carotid sinus is also located at the bifurcation of the common carotid artery but is visible as a dilatation of the internal carotid artery. It consists of baroreceptors innervated by the sinus branch of the glossopharyngeal nerve which are capable of detecting changes in blood pressure. In addition, there are barorecptors in the aortic arch but these are innervated by the vagus nerve). The carotid sinus can be massaged in order to slow the heart rate.. ...
Free, official coding info for 2021 ICD-10-CM G90.01 - includes detailed rules, notes, synonyms, ICD-9-CM conversion, index and annotation crosswalks, DRG grouping and more.
Afferent fibres from CNIX and CNX travel to the NTS in the medulla. Effector neurons from the RVLM are GABAergic and therefore inhibitory, i.e. increased baroreceptor discharge reduces tonic sympathetic tone and increases vagal tone.. Increased baroreceptor activity therefore results in:. ...
Learn about the potential side effects of Nexafed Sinus Pressure + Pain (acetaminophen/pseudoephedrine). Includes common and rare side effects information for consumers and healthcare professionals.
1. Irrigate your nasal passageways. Allergen particles, like bacteria, dust, pollen and others are washed off when a nasal rinse is done because it cleans out our mucus membranes and prevents the formation of more bacteria. The purpose of the mucus on our faces is to fight infections and, thereby, eliminate the incidence of sinusitis. Over the counter medications and nasal irrigation products are available and most have been found to be very effective. To know if a particular nasal irrigation product is fit for you, consult an ear, nose and throat doctor.When doing an assignment on Sinus Pressure, it is always better to look up and use matter like the one given here. Your assignment turns out to be more interesting and colorful this way ...
Looking for Baroreceptors? Find out information about Baroreceptors. sensory nerve terminals in blood vessels that perceive changes in blood pressure and reflexly regulate its level. Baroreceptors become stimulated when the... Explanation of Baroreceptors
If the error occurs frequently, request an RMA in order to replace the 6148A module, and mark the module for EFA.%LTL-SP-2-LTL_PARITY_CHECK: LTL parity check request for 0x[hex]ExplanationThis is the result of The outputs of the atrial and ventricular sensing circuits, 82 and 84, are connected to the microcontroller 60 which, in turn, are able to trigger or inhibit the atrial and ventricular No. 4,788,980 (Mann et al.). See the illustration on the side access panel for the correct memory configurations, and reseat the DIMMs accordingly. 216-Memory Size Exceeds Maximum Supported The amount of memory installed exceeds that supported The error is thus corrected and processing returns to FIG. 3. As used herein, the phrase coronary sinus region refers to the vasculature of the left ventricle, including any portion of the coronary sinus, great cardiac vein, left marginal vein, left posterior The switch was still under warranty from the used hardware > reseller, so the blade was replaced. Imprecise ...
As this is a potentially perilous procedure, the doctor usually performs it in conditions that take into consideration test sensitivity. For example, the massage table would be tilted at an angle of 70 degrees. Explaining to the patient the possible side effects and checking for contraindications should be done before the message.. The physician would ask the patient to relax and lie down on their back having extended the neck and turn the head so that the side that is being rubbed is facing upwards. A cardiac monitor would also be attached to the patient in order to monitor the heart rate. Once the patient has been in this position for five minutes, the massage can be performed. Imagine a horizontal line that begins about an inch and a half below the earlobe. Place the tips of the index and middle finger here. Applying the amount of pressure you would use to indent a tennis ball, massage the area in a counter-clockwise circle. Identify the carotid sinus and massage gently applying steady ...
I dont get sinus infection issues, so I dont know if thats related to the flu/common cold brain fog. My pet neurological theory is that the dopamine levels in the system go down, but if thats true I dont have any idea why that happens -- or maybe thats how the body forces one to rest and the brain fog and irritability is a side effect. Also side effects from any medication taken shouldnt be ruled out -- antihistamines can have a sort of brain fog effect (the 70s antihistimine du jour Actifed comes to mind ...
How to Massage Your Sinuses. If you are suffering from sinus pressure or congestion, massaging your sinuses may help to alleviate some of your irritation. Massaging the sinuses and the tissues surrounding the sinuses can help relieve the...
Nasal trauma can cause a deviated septum, but some people are simply born with the condition. Some of the symptoms or side effects of this condition include:
Hi ladies Thanks again for all your replies in this forum. I never thought I would make it to pass the 6 mo mark... DD is almost 10mo!!! Anyway, DD has been sick this week, pink eye/congestion and this morning I woke up with sore throat and a lot of sinus pressure. Im thinking is allergies because of all the crazy pollen out there now! Ive been feeling not very well through the day and I was wondering if there is anything at all I could take to at least calm the sinus pressure or the
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Doctor, I have been experiencing something for over a week now. Its a pressure in my head, feels very similar to sinus pressure, but paired with it is a shortness of breath, a difficulty seeing, slight cough at times, feeling faint and di
Nasty snot in the mask is a common issue and another one of the unladylike things I suffer with. I experience often. I am one of those many people across America and especially in Florida who struggle with sinus pressure and pain. Rich will tell you that I can tell him when a good strong…
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Carotid sinus syncope is due to pressure on the carotid sinus in the neck.[2] The underlying mechanism involves the nervous ... Carotid sinus syncope[edit]. Pressing upon a certain spot in the neck.[5] This may happen when wearing a tight collar, shaving ... Vasovagal, situational, carotid sinus syncope[1]. Diagnostic method. Based on symptoms after ruling out other possible causes[3 ... Reflex syncope is divided into three types: vasovagal, situational, and carotid sinus.[2] Vasovagal syncope is typically ...
The left and right internal carotid arteries arise from the left and right common carotid arteries. ... The posterior communicating artery is given off as a branch of the internal carotid artery just before it divides into its ... In another variation the anterior communicating artery is a large vessel, such that a single internal carotid supplies both ... Blood flows up to the brain through the vertebral arteries and through the internal carotid arteries. ...
The ascending cervical artery is a small branch which arises from the inferior thyroid artery as it passes behind the carotid ... It then turns medially behind the carotid sheath and its contents, and also behind the sympathetic trunk, the middle cervical ...
common carotid. *External carotid. *Internal carotid. *Carotid body. *Carotid sinus. *Carotid bifurcation ...
carotid sinus. petrous. *Vidian. *caroticotympanic. cavernous/. ophthalmic. *orbital group:anterior ethmoidal. *posterior ...
The lingual artery arises from the external carotid between the superior thyroid artery and facial artery. It can be located ...
The superior thyroid artery arises from the external carotid artery just below the level of the greater cornu of the hyoid bone ... The sternocleidomastoid branch runs downward and laterally across the sheath of the common carotid artery, and supplies the ... This artery branches from the superior thyroid artery near its bifurcation from the external carotid artery. Together with the ... The internal carotid and vertebral arteries. Right side. (Superior thyroid visible at center.) ...
... of the circle of Willis and joins with blood supplied to the anterior part of the circle of Willis from the internal carotid ...
... the OA branches just before the internal carotid exits the cavernous sinus. The OA arises from the internal carotid along the ... The ophthalmic artery (OA) is the first branch of the internal carotid artery distal to the cavernous sinus. Branches of the OA ... The OA emerges from the internal carotid artery usually just after the latter emerges from the cavernous sinus although in some ... Internal carotid. Branches. Lacrimal artery Supraorbital artery Posterior ethmoidal artery Anterior ethmoidal artery Internal ...
... they also supply the mucous membrane of the maxillary sinus. ...
External carotid artery. Branches. Transverse facial artery Middle temporal artery Anterior auricular branch frontal branch ... The superficial temporal artery is the smaller of two end branches that split superiorly from the external carotid. Based on ... It arises from the external carotid artery when it splits into the superficial temporal artery and maxillary artery. ... The superficial temporal artery joins (anastomoses) with (among others) the supraorbital artery of the internal carotid artery ...
The MCA arises from the internal carotid and continues into the lateral sulcus where it then branches and projects to many ... The left and right MCAs rise from trifurcations of the internal carotid arteries and thus are connected to the anterior ... Other cases include duplication of the MCA at the internal carotid artery (ICA) or an accessory MCA (AccMCA) which arise not ... The middle cerebral arteries (top of figure) arise from the internal carotid arteries. ...
Superficial dissection of the right side of the neck, showing the carotid and subclavian arteries ...
Dale H. Rice, Steven D. Schaefer, Lewis E. Calver (2003), Endoscopic paranasal sinus surgery, Lippincott Williams & Wilkins, p ...
"Apparatus and method for measurement of digital pressure applied to carotid sinus for causing carotid sinus syndrome". Acta ... Johann Nepomuk Czermak stated that mechanical compression of the carotid artery due to the carotid sinus reflex initiates a ... The Czermak-Hering test is a vagal maneuver consisting of the application of external digital pressure to the carotid sinus. ... Carotid sinus massage Takino, Masuichi; Takino, Yoshitada; Sugahara, Kunikazu (March 1964). " ...
Carotid sinus syndrome (carotid sinus syncope)-see Carotid sinus § Disease of the carotid sinus ...
In the cavernous sinus it runs alongside the internal carotid artery. It then enters the orbit through the superior orbital ... cavernous sinus diseases and various neuropathies. Perhaps the most common overall cause of sixth nerve impairment is diabetic ... At the tip of the petrous part of the temporal bone it makes a sharp turn forward to enter the cavernous sinus. ... as can aneurysms of the intracavernous carotid artery. Mass lesions that push the brainstem downward can damage the nerve by ...
Chapleau MW, Hajduczok G, Abboud FM (July 1992). "Suppression of baroreceptor discharge by endothelin at high carotid sinus ... Wallbach, M; Koziolek, MJ (9 November 2017). "Baroreceptors in the carotid and hypertension-systematic review and meta-analysis ...
Fainting may result from subclavian steal syndrome or carotid sinus hypersensitivity. There is also often anemia and marked ... Due to obstruction of the main branches of the aorta, including the left common carotid artery, the brachiocephalic artery, and ...
... the rapidity of death can be affected by the susceptibility to carotid sinus stimulation. Carotid sinus reflex death is ... Passig, K. Carotid Sinus reflex death - a theory and its history. www.datenschlag.org. URL last accessed February 28, 2006. ... Stimulation of the carotid sinus reflex-causing bradycardia, hypotension, or both. Depending on the particular method of ... Incomplete occlusion of the carotid arteries is expected and, in cases of homicide, the victim may struggle for a period of ...
Carotid sinus syncope is due to pressure on the carotid sinus in the neck. The underlying mechanism involves the nervous system ... Reflex syncope is divided into three types: vasovagal, situational, and carotid sinus. Vasovagal syncope is typically triggered ...
He suffered a basilar skull fracture, damaged his carotid artery and sinus. He recovered and returned to race the entire 2000 ...
This loss of pressure is interpreted by baroreceptors in the carotid sinus. It can also be activated by a decrease in the ...
Horses lack a carotid rete and instead use their sinuses to cool blood around the brain. These factors suggest that the ... Many ungulates have a specialized network of blood vessels called the carotid rete, which keeps the brain cool while the body ...
... which is the portion of the internal carotid plexus in the cavernous sinus. The plant genus Waltheria from the family ...
"BestBets: Comparing Valsalva manoeuvre with carotid sinus massage in adults with supraventricular tachycardia". Archived from ...
Carotid sinus massage is used to diagnose carotid sinus syncope and is sometimes useful for differentiating supraventricular ... "Comparison of treatment of supraventricular tachycardia by Valsalva maneuver and carotid sinus massage". Annals of Emergency ...
"Comparison of Treatment of Supraventricular Tachycardia by Valsalva Maneuver and Carotid Sinus Massage". Annals of Emergency ... or to clear the ears and sinuses (that is, to equalize pressure between them) when ambient pressure changes, as in diving, ... the existence of a connection between the oral cavity and the maxillary sinus. The Valsalva maneuver is used to aid diagnosis ...
Wang, W; Chen, JS; Zucker, IH (Jun 1990). "Carotid sinus baroreceptor sensitivity in experimental heart failure". Circulation. ...
External Manual Carotid Compression is Effective in Patients with Cavernous Sinus Dural Arteriovenous Fistulaetreatment. The ... DAVFs may also be asymptomatic (e.g. cavernous sinus DAVFs). Most commonly found adjacent to dural sinuses in the following ... Type II: dural arterial supply drains into venous sinus. High pressure in sinus results in both anterograde drainage and ... and it is associated with transverse-sigmoid sinus DAVFs. Carotid-cavernous DAVFs, on the other hand, are more closely ...
Surgery (e.g. septoplasty and functional endoscopic sinus surgery). Systemic factors[edit]. Most common factors[edit]. * ... More rarely the maxillary or a branch of the external carotid artery can be ligated. The bleeding can also be stopped by intra- ...
Aneurysm of sinus of Valsalva. *Aortic dissection. *Coronary artery aneurysm. *head / neck *Intracranial aneurysm ...
Carotid duplex: A carotid duplex is an ultrasound study that assesses whether or not you have atherosclerosis (narrowing) of ... cerebral venous sinus thrombosis). Nonpenetrating and penetrating cranial trauma can also be common causes of intracerebral ... the carotid arteries. These arteries are the large blood vessels in your neck that feed your brain. Transcranial Doppler (TCD ...
Aneurysm of sinus of Valsalva. *Aortic dissection. *Aortic rupture. *Coronary artery aneurysm ...
Sinus tachycardia, which originates from the sino-atrial (SA) node, near the base of the superior vena cava ... Hyperthyroidism can also cause tachycardia.[5] The upper limit of normal rate for sinus tachycardia is thought to be 220 bpm ... ECG showing sinus tachycardia with a rate of about 100 beats per minute. ... Sinus tachycardia, Atrial tachycardia, AV nodal reentrant tachycardia. ...
Beberapa ahli lain mempertimbangan klasifikasi berdasarkan fenotipe seperti keberadaan internal carotid artery plaque, intima- ... cerebral venous sinus thrombosis; stroke saat kehamilan, stroke akibat penggunaan hormon pasca menopause, penggunaan senyawa ... extracranial carotid ultrasonography, dan jika memungkinkan, cerebral angiography. ...
The coronary arteries start in the right and left aortic sinus and provide blood to the heart muscle in a similar fashion to ... The ophthalmic rete is analogous to the carotid rete found in mammals, as it also facilitates transfer of heat from arterial ... The brain was found to maintain a warmer temperature when compared to carotid arterial blood supply. Researchers hypothesize ...
Aneurysm of sinus of Valsalva. *Aortic dissection. *Coronary artery aneurysm. *head / neck *Intracranial aneurysm ...
... and measured by stretch receptors in the walls of the aortic arch and carotid sinuses at beginnings of the internal carotid ... High pressure receptors called baroreceptors in the walls of the aortic arch and carotid sinus (at the beginning of the ... in the carotid artery and aortic arch. A change in the partial pressure of carbon dioxide is detected as altered pH in the ... internal carotid artery) monitor the arterial blood pressure.[46] Rising pressure is detected when the walls of the arteries ...
Fluid can be injected into the arterial system (typically through the carotid or femoral arteries), the main body cavities, ... "Evolution of the paranasal sinuses' anatomy through the ages". Anatomy & Cell Biology. 46 (4): 235-38. doi:10.5115/acb.2013.46 ...
There is no direct connection between the internal carotid artery and the vessels of the brain.[72] Their circulatory system ... Vaquita (P. sinus). *Burmeister's porpoise (P. spinipinnis). Phocoenoides. *Dall's porpoise (P. dalli) ...
Since early in the 1980s, fetal, porcine, carotid or retinal tissues have been used in cell transplants, in which dissociated ...
Carotid sinus syncope. *Heat syncope. *Vasovagal episode. Other. *Amnesia *Anterograde amnesia. *Retrograde amnesia ...
Aneurysm of sinus of Valsalva. *Aortic dissection. *Aortic rupture. *Coronary artery aneurysm ...
... which are called the aortic sinuses or the sinuses of Valsalva. The left aortic sinus contains the origin of the left coronary ... Left common carotid artery. Left subclavian artery. Descending aorta, thoracic part: Left bronchial arteries. esophageal ... For example, the left vertebral artery may arise from the aorta, instead of the left common carotid artery.[9]:188 ... Combination of coronary sinus, superior vena cava and inferior vena cava. Supplies. The systemic circulation. (entire body with ...
At its origin, the internal carotid artery is somewhat dilated. This part of the artery is known as the carotid sinus or the ... The internal carotid runs vertically upward in the carotid sheath, and enters the skull through the carotid canal. During this ... the external carotid artery. The cervical segment, or C1, or cervical part of the internal carotid, extends from the carotid ... Unlike the external carotid artery, the internal carotid normally has no branches in the neck. The petrous segment, or C2, of ...
The other type, carotid artery dissection, involves the carotid arteries. Vertebral artery dissection is further classified as ... It is therefore possible for the symptoms to occur on both sides, or for symptoms of carotid artery dissection to occur at the ... Prior to this, there had been isolated case reports about carotid dissection. In 1971, C. Miller Fisher, a Canadian neurologist ... While dissection of the carotid and vertebral arteries accounts for only 2% of strokes (which are usually caused by high blood ...
Internal carotid artery. *Tip of basilar artery. Saccular aneurysms tend to have a lack of tunica media and elastic lamina ... Aneurysm of sinus of Valsalva. *Aortic dissection. *Coronary artery aneurysm. *head / neck *Intracranial aneurysm ...
A very small proportion is due to cerebral venous sinus thrombosis. Risk factors for ICH include:[12] ...
Lateral surface: Carotid groove. *Sphenoidal lingula. *Anterior surface: Sphenoidal sinuses. Great wings. *foramina *Rotundum ...
Q18.0) Sinus, fistula and cyst of branchial cleft *Congenital preauricular fistula: A small pit in front of the ear. Also known ... H05.81) Carotid cavernous fistula. *(H70.1) Mastoid fistula *Craniosinus fistula: between the intracranial space and a ... with only one open end; blind fistulas may also be called sinus tracts ...
common carotid. *External carotid. *Internal carotid. *Carotid body. *Carotid sinus. *Carotid bifurcation ... left common carotid artery (directly from arch of aorta on left mostly)[edit]. internal carotid artery[edit]. *ophthalmic ... external carotid artery[edit]. *Arising in carotid triangle[1] *Superior thyroid artery *Hyoid (infrahyoid) artery ... 2.2 left common carotid artery (directly from arch of aorta on left mostly) *2.2.1 internal carotid artery ...
The groove is curved like the italic letter f, and lodges the internal carotid artery and the cavernous sinus.[citation needed] ... The carotid groove is a anatomical groove in the sphenoid bone located above the attachment of each great wing of the sphenoid ... Sphenoid bone is in yellow, and carotid groove is labeled at center of sphenoid. ... Retrieved from "https://en.wikipedia.org/w/index.php?title=Carotid_groove&oldid=915856032" ...
bruit over one or both carotid arteries or abdominal aorta. *arteriographic narrowing of aorta, its primary branches, or large ... paranasal sinus abnormalities. *vessel biopsy showing eosinophils in extravascular areas. Microscopic polyarteritis/ ...
The most important arterial baroreceptors are located in the left and right carotid sinuses and in the aortic arch.[70] ...
carotid sinus synonyms, carotid sinus pronunciation, carotid sinus translation, English dictionary definition of carotid sinus ... n. A dilated area located at the bifurcations of the carotid arteries and containing numerous baroreceptors that function in ... Related to carotid sinus: carotid artery, Baroreceptors, carotid sinus massage, Carotid sinus reflex ... Carotid sinus - definition of carotid sinus by The Free Dictionary https://www.thefreedictionary.com/carotid+sinus ...
Arteriovenous Malformation (AVM)/Fistula carotid cavernous sinus fistula Brain Aneurysm Cerebral Cavernous Malformation Dural ... Arteriovenous Malformation (AVM)/Fistula carotid cavernous sinus fistula Brain Aneurysm Cerebral Cavernous Malformation Dural ... What is a Carotid Cavernous Fistula?. Carotid cavernous fistulas (CCFs) are abnormal connections between the blood vessels that ... Diagnosing Carotid Cavernous Fistula. Symptoms of Carotid Cavernous Fistula. Your physician will also ask you about your ...
Massage of the carotid sinus, carotid sinus massage is used to diagnose carotid sinus syncope and is sometimes useful for ... a condition known as carotid sinus hypersensitivity, carotid sinus syndrome or carotid sinus syncope, in which manual ... The carotid sinus extends from the bifurcation to the "true" internal carotid artery. The carotid sinus is sensitive to ... The carotid sinus baroreceptors are innervated by the carotid sinus nerve, which is a branch of the glossopharyngeal nerve (CN ...
... carotid sinus nerve or Herings nerve) is a small branch of the glossopharyngeal nerve that innervates the carotid sinus and ... and then divides in the angle of the bifurcation of the common carotid artery to innervate the carotid body and carotid sinus. ... It carries impulses from the baroreceptors in the carotid sinus to the vasomotor center in the brainstem (to help maintain a ... It is a branch of the glossopharyngeal nerve that runs downwards, anterior to the internal carotid artery. It communicates with ...
... Gautam Bir Singh,1,2 Anil K. Rai,3 Sarvejeet Singh,3 and ... Gautam Bir Singh, Anil K. Rai, Sarvejeet Singh, and Mukul Sinha, "A Rare Case of Lateral Sinus Thrombosis with Carotid Space ...
In this article, we discuss the use of carotid sinus mas ... In this article, we discuss the use of carotid sinus massage ( ... 24607007 - Tension to passively cinch the mitral annulus through coronary sinus access: an ex vivo.... 9403167 - Mechanisms and ...
... Hypoglossal nerve, cervical plexus, and their ... Branch of glossopharyngeal nerve to carotid sinus Nerve: ... The branch of the glossopharyngeal nerve to the carotid sinus ... It uses material from the Wikipedia article "Branch_of_glossopharyngeal_nerve_to_carotid_sinus". A list of authors is available ... nucleus ambiguus • ganglia (superior, petrous) • tympanic (tympanic plexus, lesser petrosal) • carotid sinus • pharyngeal ...
2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode. ...
Inhibition of the Carotid Sinus Reflex by Stimulation of the Inferior Olive ... Inhibition of the Carotid Sinus Reflex by Stimulation of the Inferior Olive ... Inhibition of the Carotid Sinus Reflex by Stimulation of the Inferior Olive ... Inhibition of the Carotid Sinus Reflex by Stimulation of the Inferior Olive ...
What is Carotid sinus baroreflex? Meaning of Carotid sinus baroreflex medical term. What does Carotid sinus baroreflex mean? ... Looking for online definition of Carotid sinus baroreflex in the Medical Dictionary? Carotid sinus baroreflex explanation free ... Related to Carotid sinus baroreflex: Carotid sinus reflex, Carotid sinus baroreceptor stimulation, Carotid sinus stimulation ... Synonym(s): sinus caroticus [TA], carotid bulb. carotid sinus. n.. A dilated area located at the bifurcations of the carotid ...
What is carotid sinus reflex? Meaning of carotid sinus reflex medical term. What does carotid sinus reflex mean? ... Looking for online definition of carotid sinus reflex in the Medical Dictionary? carotid sinus reflex explanation free. ... carotid sinus reflex. Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.. Related to carotid sinus reflex: gag reflex, ... carotid sinus. a dilatation of the proximal portion of the internal carotid or distal portion of the common carotid artery, ...
Paranasal Sinuses, & Nasopharynx - Download as PDF File (.pdf), Text File (.txt) or view presentation slides online. Deep ... This space includes the extracranial carotid artery. the tongue base. Carotid Space * Includes carotid artery. internal. ... Obstructs sinuses. Fungiform papilloma: Arises from nasal septum. * Mucocele: an obstructed sinus. and maxillary). the finding ... external carotid artery. The retromandibular vein in external carotid arteries also pass through this space. ...
Contraindications to carotid sinus massage should be respected and the standardized technique used. ... Neurological complications following carotid sinus massage for diagnosis of the carotid sinus syndrome are uncommon and usually ... Conclusions: Neurological complications following carotid sinus massage for diagnosis of the carotid sinus syndrome are ... Contraindications to carotid sinus massage were the presence of carotid bruits, recent myocardial or cerebral ischemia, or ...
Home , December 2018 - Volume 85 - Issue 6 , Re: Prediction of traumatic carotid-cavernous sinus fistula... ... Prediction of traumatic carotid-cavernous sinus fistula via noncontrast computed tomography by fracture pattern and abnormality ... Re: Prediction of traumatic carotid-cavernous sinus fistula via noncontrast computed tomography by fracture pattern and ...
... was also found to activate the carotid sinus reflexes as an increase in sinus nerve activity occurred which coincided with ... CAROTID SINUS REFLEX CHANGES PRODUCED BY DIGITALIS Message Subject (Your Name) has forwarded a page to you from Journal of ... CAROTID SINUS REFLEX CHANGES PRODUCED BY DIGITALIS. JOHN A. QUEST and RICHARD A. GILLIS ... CAROTID SINUS REFLEX CHANGES PRODUCED BY DIGITALIS. JOHN A. QUEST and RICHARD A. GILLIS ...
Carotid body Carotid sinus nerve Glucose tolerance Insulin resistance KHFAC modulation Neuromodulation Type 2 diabetes ... Bioelectronic modulation of carotid sinus nerve activity in the rat: a potential therapeutic approach for type 2 diabetes. ... Carotid sinus nerve (CSN) denervation has been shown to improve glucose homeostasis in insulin-resistant and glucose-intolerant ... the carotid sinus nerve (CSN), restores insulin sensitivity and glucose tolerance in high-energy-fed animal models of insulin ...
Rhinoscopic Clinic). by Ear, Nose and Throat Journal; Health, general Carotid sinus Abnormalities Optic nerve Sphenoid bone ... The optic nerve and the internal carotid artery in the sphenoid sinus. ( ... APA style: The optic nerve and the internal carotid artery in the sphenoid sinus. (Rhinoscopic Clinic).. (n.d.) >The Free ... The endoscopic sinus surgeon should remember the anatomic relationship of the optic nerve and the internal carotid artery in ...
Find out information about Carotid Sinus. An enlargement at the bifurcation of each carotid artery that is supplied with ... Related to Carotid Sinus: carotid artery, Baroreceptors, carotid sinus massage, Carotid sinus reflex ... Carotid body tumor presenting with carotid sinus syndrome.. A Rare Case of Carotid Body Tumor Presenting with Internal Carotid ... Carotid Sinus , Article about Carotid Sinus by The Free Dictionary https://encyclopedia2.thefreedictionary.com/Carotid+Sinus ...
Restoring PSVT to sinus rhythm. Valsalva 16.7% vs Carotid sinus massage 0%. Operator bias, small numbers, lack of blinding, ... Valsalva 12.0% vs carotid sinus massage 6.3%; p. Total instances of PSVT sucessfully treated by vagal manoeuvres without ... Right and left carotid sinus massage and the diving reflex were considerably less effective than the valsalva manoeuvre. ... overal sucess rate: Valsalva 18.0% vs Carotid sinus massage 11.8%; p=NS; CI [-2.8% to 20.7%]. Outcomes were not assessed blind ...
"Carotid Sinus" by people in this website by year, and whether "Carotid Sinus" was a major or minor topic of these publications ... "Carotid Sinus" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical Subject ... Phase resetting of the respiratory oscillator by carotid sinus nerve stimulation in cats. J Physiol. 1998 Jan 15; 506 ( Pt 2): ... Raiciulescu N, Bittman E, Voinescu S. [Influence of the mesencephalic reticular formation on carotid sinus baroceptor reflexes ...
A patient is presented in whom rupture of an aneurysm wholly within the cavernous sinus caused a subarachnoid hemorrhage. The ... Aneurysms arising from the intracavernous portion of the internal carotid artery very rarely rupture. ... Carotid Artery Diseases / complications*. Carotid Artery, Internal / radiography, surgery. Cavernous Sinus. Female. Humans. ... A patient is presented in whom rupture of an aneurysm wholly within the cavernous sinus caused a subarachnoid hemorrhage. The ...
The sick sinus syndrome is a disease of the sinus node and occurs in middle-aged and older patients, with some exceptions. The ... Carotid sinus syndrome and falls in older adults. Am J Geriatr Cardiol 2001;10:97-9PubMedCrossRefGoogle Scholar ... the carotid sinus syndrome, which is different from the sick sinus syndrome, is briefly discussed. ... The sick sinus syndrome is a disease of the sinus node and occurs in middle-aged and older patients, with some exceptions. The ...
Patel A K, Yap V U, Fields J, Thomsen J H. Carotid sinus syncope induced by malignant tumors in the neck. Arch Intern Med. 1979 ... Glossopharyngeal and Limited Vagal Neurectomy for Cancer-Related Carotid Sinus Syncope. Harrison W. Lin, M.D.,1,2 Michael B. ... Frank J I, Ropper A H, Zuniga G. Vasodepressor carotid sinus syncope associated with a neck mass. Neurology. 1992;42(6):1194- ... Muntz H R, Smith P G. Carotid sinus hypersensitivity: a cause of syncope in patients with tumors of the head and neck. ...
... carotid body artery; CC, carotid canal; CCA, common carotid artery; CS, carotid sinus; CSN, carotid sinus nerve; ECA, external ... 18 was adapted to stimulate the carotid sinus. Thus, simultaneous electric stimulation of the carotid sinus and carotid sinus ... Moreover, combined electric stimulation of the carotid sinus and the carotid sinus nerve in the absence of the carotid ... of the carotid sinus and carotid sinus nerve in conscious rats during 20 s. BARO-X indicates denervated carotid baroreceptor; ...
MANUAL COMPRESSION OF THE CAROTID VESSELS, CAROTID SINUS HYPERSENSITIVITY AND CAROTID ARTERY OCCLUSIONS1 ALLEN SILVERSTEIN, M.D ... MANUAL COMPRESSION OF THE CAROTID VESSELS, CAROTID SINUS HYPERSENSITIVITY AND CAROTID ARTERY OCCLUSIONS1. Ann Intern Med. 1960; ... BUCKLING OF THE CAROTID ARTERY DEMONSTRATED BY ANGIOCARDIOGRAPHY1 Annals of Internal Medicine; 44 (5): 1003-1007 ... "Subclavian Steal Syndrome" with Reversal of Blood Flow in the Right Carotid Artery Annals of Internal Medicine; 64 (1): 142-144 ...
Carotid sinus reaction (CSR) is one of the most common complications of internal carotid artery angioplasty (CA). It may occur ... The association of carotid artery stenosis with carotid sinus hypersensitivity. J Cardiovasc Surg 1990;31:693-96. ... BACKGROUND AND PURPOSE:Carotid sinus syncope may occur acutely during internal carotid artery angioplasty (CA). We performed ... Clinical and Electroencephalographic Features of Carotid Sinus Syncope Induced by Internal Carotid Artery Angioplasty. E. ...
Superior Petrosal Sinus Catheterization for Transvenous Embolization of a Dural Carotid Cavernous Sinus Fistula. Charbel ... Superior Petrosal Sinus Catheterization for Transvenous Embolization of a Dural Carotid Cavernous Sinus Fistula ... Superior Petrosal Sinus Catheterization for Transvenous Embolization of a Dural Carotid Cavernous Sinus Fistula ... Superior Petrosal Sinus Catheterization for Transvenous Embolization of a Dural Carotid Cavernous Sinus Fistula ...
carotid-cavernous fistula; dural cavernous sinus fistula; intracavernous carotid artery; cavernous sinus; angiography; arterial ... Lie TA: Congenital Anomalies of the Carotid Arteries, Including the Carotid-Basilar and Carotid-Vertebral Anastomoses. An ... Bennett DR, , Van Dyk HJL, & Davis DO: Carotid cavernous sinus fistula closure following angiography. JAMA 224:1637-1639, 1973 ... Mullan S: Treatment of carotid-cavernous fistulas by cavernous sinus occlusion. J Neurosurg 50:131-144, 1979 Mullan S: ...
Carotid Sinus Reflex Control of Renin Release in Hypertensive Subjects with High Renin Secretion. G. Mancia, A. Ferrari, G. ... Carotid Sinus Reflex Control of Renin Release in Hypertensive Subjects with High Renin Secretion ... Carotid Sinus Reflex Control of Renin Release in Hypertensive Subjects with High Renin Secretion ... Carotid Sinus Reflex Control of Renin Release in Hypertensive Subjects with High Renin Secretion ...
Methods: Carotid sinus massage (CSM) was performed both supine and during 60° head-up tilt. Beat-to-beat blood pressure, heart ... Objective: To determine the frequency, age distribution and clinical presentation of carotid sinus hypersensitivity (CSH) among ... Unexplained syncope-is screening for carotid sinus hypersensitivity indicated in all patients aged ,40 years? ... Unexplained syncope-is screening for carotid sinus hypersensitivity indicated in all patients aged ,40 years? ...
  • ClickPress, Fri Jul 04 2014] GlobalData's clinical trial report, " Carotid Sinus Syncope Global Clinical Trials Review, H1, 2014" provides data on the Carotid Sinus Syncope clinical trial scenario. (thefreedictionary.com)
  • The carotid sinus can be oversensitive to manual stimulation, a condition known as carotid sinus hypersensitivity, carotid sinus syndrome or carotid sinus syncope, in which manual stimulation causes large changes in heart rate and/or blood pressure. (wikipedia.org)
  • Massage of the carotid sinus, carotid sinus massage is used to diagnose carotid sinus syncope and is sometimes useful for differentiating supraventricular tachycardia (SVT) from ventricular tachycardia. (wikipedia.org)
  • The occurrence of almost all episodes just after turning the head to one side, and the symptoms patient described before the falls, raised the suspicion of syncope and the diagnosis of carotid sinus syncope was confirmed by performing carotid massage. (thefreedictionary.com)
  • carotid sinus syncope (from pressure on the carotid sinus , e. (thefreedictionary.com)
  • Head and neck cancer patients with cervical disease involving the glossopharyngeal or vagus nerves can experience dangerous cardiovascular phenomena, including carotid sinus syncope (CSS). (pubmedcentralcanada.ca)
  • The associated array of signs and symptoms, such as bradycardia, hypotension, and syncope, have collectively been described as "carotid sinus syncope" (CSS), 1 "glossopharyngeal neuralgia-asystole syndrome," 2 and "glossopharyngeal neuralgia with syncope," 3 , 4 among others. (pubmedcentralcanada.ca)
  • Carotid sinus syncope may occur acutely during internal carotid artery angioplasty (CA). We performed this study to investigate the clinical, electroencephalographic (EEG), and hemodynamic features of carotid sinus syncope induced by CA. (ajnr.org)
  • Carotid sinus reaction (CSR) and syncope occurred in 62.7% and 18.6% of the procedures, respectively. (ajnr.org)
  • Cerebral hemodynamic disturbances may play a crucial role in the pathophysiology of syncope with normal sinus rhythm and normotension. (ajnr.org)
  • Carotid sinus hypersensitivity syncope: is there a possible alternative approach to pacemaker implantation in young patients? (termedia.pl)
  • Palamà Z, Ruvo E, Grieco D, Borrelli A, Sciarra L, Calò L. Carotid sinus hypersensitivity syncope: is there a possible alternative approach to pacemaker implantation in young patients? (termedia.pl)
  • Carotid sinus hypersensitivity (CSH) is frequently found in about one third of elderly patients with syncope and trauma, but it may also be a common finding in younger patients. (termedia.pl)
  • A few reports are currently available in neurally mediated syncope and functional atrioventricular block [3, 4], but no previous experiences are available in carotid sinus hypersensitivity syncope. (termedia.pl)
  • Reflex syncope is divided into three types: vasovagal, situational, and carotid sinus. (wikipedia.org)
  • [2] Carotid sinus syncope is due to pressure on the carotid sinus in the neck. (wikipedia.org)
  • Carotid sinus hyperresponsiveness to these stimuli leads to an exaggerated response resulting in bradycardia, hypotension, syncope etc. (explainmedicine.com)
  • Carotid sinus hypersensitivity in patients presenting with syncope. (explainmedicine.com)
  • BRIGNOLE M., MENOZZI C.. The natural history of carotid sinus syncope and the effect of cardiac pacing. (explainmedicine.com)
  • How common is carotid sinus syncope? (livesstar.com)
  • Drugs known to aggravate carotid sinus syncope are digitalis, beta blockers, and calcium channel blockers. (livesstar.com)
  • When structural heart disease is excluded, tests for neurogenic reflex-mediated syncope, such as head-up tilt-table testing and carotid sinus massage, should be performed. (aafp.org)
  • The use of tests such as head computed tomography, magnetic resonance imaging, carotid and transcranial ultrasonography, and electroencephalography to detect cerebrovascular causes of syncope should be reserved for those few patients with syncope whose history suggests a neurologic event or who have focal neurologic signs or symptoms. (aafp.org)
  • Patients with syncope who have a history or physical finding suggesting a neurologic cause should receive HUTT testing, carotid sinus massage, and/or implantable loop recorder. (aafp.org)
  • To further understand the relationship between carotid mechanoreceptors and sternocleidomastoid denervation, the present study investigated the relation between the results of carotid sinus massage and electromyographic activity of the sternocleidomastoid muscles in patients without syncope. (ahajournals.org)
  • Carotid sinus syndrome is a well-established cause of syncope 1 usually treated by pacemaker implantation. (ahajournals.org)
  • Need help in choosing carotid sinus syncope doctor in Kolkata? (credihealth.com)
  • As previously noted, reflex syncope includes: VVS, carotid hypersensitivity syncope, as well as several, so-called, "situational" syncope syndromes ( Table 1 ). (medscape.com)
  • In this correspondence, the pathophysiology of reflex syncope (vasovagal syncope, carotid sinus syndrome, and situational syncope) is reviewed, including clarification of the nomenclature. (medscape.com)
  • Vasovagal syncope (VVS) and carotid sinus syndrome (CSS) are specific forms of reflex syncope. (medscape.com)
  • We retrieved electronic records concerning 3127 consecutive patients who had undergone carotid sinus massage (CSM) in the Syncope Unit of Careggi Hospital, Florence, and Ospedali del Tigullio, Lavagna, in the period 2004-2014.The study population included patients who had received cardiac pacing for CI-CSS. (onlinejacc.org)
  • This is a multi-center, prospective, observational study enrolling 400 patients with suspected or certain neurally-mediated syncope, who undergo carotid sinus massage, tilt testing and Implantable Loop Recorder (ILR)implantation. (clinicaltrials.gov)
  • The carotid sinus is in the carotid artery, which takes blood from the heart to the brain. (thefreedictionary.com)
  • 0 mm below the carotid sinus , and the diameter and IMT of the carotid artery were automatically obtained for six continuous cardiac circles. (thefreedictionary.com)
  • A tear in the wall of a weak cavernous internal carotid artery caused by congenital collagen vascular disease. (upmc.com)
  • In human anatomy, the carotid sinus is a dilated area at the base of the internal carotid artery just superior to the bifurcation of the internal carotid and external carotid at the level of the superior border of thyroid cartilage. (wikipedia.org)
  • The carotid sinus extends from the bifurcation to the "true" internal carotid artery. (wikipedia.org)
  • The carotid sinus is the reflex area of the carotid artery, consisting of baroreceptors which monitor blood pressure. (wikipedia.org)
  • It is a branch of the glossopharyngeal nerve that runs downwards, anterior to the internal carotid artery. (wikipedia.org)
  • It communicates with the vagus nerve and sympathetic trunk and then divides in the angle of the bifurcation of the common carotid artery to innervate the carotid body and carotid sinus. (wikipedia.org)
  • carotid sinus a dilatation of the proximal portion of the internal carotid or distal portion of the common carotid artery, containing in its wall pressoreceptors that are stimulated by changes in blood pressure. (thefreedictionary.com)
  • Common tumors: Metastatic squamous cell cancer Lymphoma Schwannomas/Neurofibromas Paraganglioma * Encasement of the carotid artery may mean inoperability. (scribd.com)
  • This space includes the extracranial carotid artery. (scribd.com)
  • Carotid Space * Includes carotid artery. (scribd.com)
  • The optic nerve and the internal carotid artery in the sphenoid sinus. (thefreelibrary.com)
  • S.v. The optic nerve and the internal carotid artery in the sphenoid sinus. (thefreelibrary.com)
  • These structures include (1) the optic nerve and the internal carotid artery in the superolateral wall, (2) the posterior ethmoid cells in the anterosuperior wall (the Onodi cell), (3) the maxillary nerve in the lateral wall, and (4) the canal of the vidian nerve in the floor. (thefreelibrary.com)
  • The bulges produced by the optic nerve and the internal carotid artery are of considerable clinical importance (Figure). (thefreelibrary.com)
  • If the anterior clinoid process of the lesser wing of the sphenoid bone is pneumatized, there might be a deep recess (infraoptic recess) in the superior and lateral corner of the sphenoid sinus (Figure, A & B). (1,2) Such a recess can clearly separate the optic nerve from the internal carotid artery (Figure, A & B). If the anterior clinoid process is not pneumatized, the optic nerve is sometimes difficult to identify. (thefreelibrary.com)
  • The internal carotid artery originates in the common carotid artery in the neck and ascends toward the brain. (thefreelibrary.com)
  • The internal carotid artery enters the carotid canal in the petrous portion of the temporal bone. (thefreelibrary.com)
  • The cavernous portion of the internal carotid artery lies within the cavernous sinus. (thefreelibrary.com)
  • The artery lies adjacent to the sphenoid sinus during its passage through the cavernous sinus and produces a variable bulge in the lateral wall of the sphenoid sinus (Figure, B-D). (2) These variations can cause different patterns of bulges in the internal carotid arteries in the sphenoid sinus. (thefreelibrary.com)
  • The endoscopic sinus surgeon should remember the anatomic relationship of the optic nerve and the internal carotid artery in the sphenoid sinus. (thefreelibrary.com)
  • Palpation of the superolateral wall of the sphenoid sinus with a sharp, pointed instrument during surgery and during the postoperative period, when a sphenoidotomy is done, should be avoided to prevent injury to the exposed optic nerve or internal carotid artery. (thefreelibrary.com)
  • An enlargement at the bifurcation of each carotid artery that is supplied with sensory nerve endings and plays a role in reflex control of blood pressure. (thefreedictionary.com)
  • bulbus caroticus, sinus caroticus , the dilated area of the common carotid artery before bifurcation into its external and internal branches. (thefreedictionary.com)
  • The dilated portion of the common carotid artery at its bifurcation into external and internal carotids. (umassmed.edu)
  • Subarachnoid hemorrhage possibly caused by a saccular carotid artery aneurysm within the cavernous sinus. (biomedsearch.com)
  • Aneurysms arising from the intracavernous portion of the internal carotid artery very rarely rupture. (biomedsearch.com)
  • On examination, a right neck mass was found, and an otolaryngology consultation revealed a T4N2a right base of tongue squamous cell carcinoma with neck metastasis encasing the carotid artery and involving the skull base. (pubmedcentralcanada.ca)
  • That compression of a carotid artery may induce a change in cerebral function was apparently known by the ancient Greeks. (annals.org)
  • Carotid sinus reaction (CSR) is one of the most common complications of internal carotid artery angioplasty (CA). It may occur due to an abnormal response to a baroreflex related to an overstretch of the carotid sinus caused by the dilating balloon. (ajnr.org)
  • Cerebral angiography revealed a DCCF fed by arterial rami arising from the ipsilateral carotid siphon and by branches of the right middle meningeal artery ( Fig 1 ). (ajnr.org)
  • Dziedzic T, Koczyk K, Gotlib T, Kunert P, Maj E, Marchel A. Sphenoid sinus septations and their interconnections with parasphenoidal internal carotid artery protuberance: radioanatomical study with literature review. (termedia.pl)
  • Internal carotid artery (ICA) injury is the most dangerous and life-threatening complication in patients operated on due to parasellar tumors via a minimally invasive endoscopic endonasal approach. (termedia.pl)
  • To determine the relationship between the sphenoid sinus septa and the parasellar or paraclival internal carotid artery prominence based on our own material and a literature review. (termedia.pl)
  • Consecutive patients undergoing eCEA for primary high-grade internal carotid artery (ICA) stenosis without contralateral pathology were selected for this study. (springermedizin.at)
  • Spontaneous dissection of the cervical internal carotid artery (sICAD) is a major cause of stroke in young adults. (uzh.ch)
  • Carotid artery geometries segmented from magnetic resonance images of a healthy subject at different static head positions were used to define a path of motion and deformation of the right cervical internal carotid artery (ICA). (uzh.ch)
  • A role of the carotid sinus as a geometrically compliant feature accommodating extension of the artery is shown. (uzh.ch)
  • Exaggerated carotid sinus massage responses are related to severe coronary artery disease in patients being evaluated for chest pain. (semanticscholar.org)
  • The extracranial portion of the internal carotid artery was postnatally absent in both sheep and goat specimens. (iastate.edu)
  • The carotid body cells were observed in an aberrant position (intracranially in the wall of the internal carotid artery) due to regression of the extracranial portion of the internal carotid artery after birth. (iastate.edu)
  • Carotid massage involves gently massaging the carotid artery for 5-10 seconds on one side of the neck whilst monitoring the heart rhythm and blood pressure. (medicalnotes.info)
  • There is a carotid sinus on each side of the neck situated where the carotid artery separates into two (roughly just below the ears). (medicalnotes.info)
  • The carotid sinus is found at the bifurcation of the common carotid artery (just lateral to the thyroid cartilage of the larynx ), and contains baroreceptor s which normally sense blood pressure (together with similar receptors in the aortic arch ). (everything2.com)
  • Dehiscent carotid artery visualized in left aspect of sphenoid sinus. (sinusvideos.com)
  • Carotid baroreceptors detect the blood pressure in the carotid artery, which supplies blood to the brain. (frontiersin.org)
  • The nerve terminals of carotid baroreceptors are located bilaterally at the carotid artery bifurcations, close to the internal carotid artery. (frontiersin.org)
  • IMSEAR at SEARO: Cavernous sinus thrombophlebitis causing reversible narrowing of internal carotid artery. (who.int)
  • Madhusudhan KS, Kandpal H, Ahuja J. Cavernous sinus thrombophlebitis causing reversible narrowing of internal carotid artery. (who.int)
  • T he role of adjustable clamps for carotid artery occlusion in the treatment of intracranial aneurysms and cavernous sinus fistulas has decreased during the last two decades with the development of improved microvascular techniques and the advent of interventional radiology. (thejns.org)
  • However, in the past, many patients have been treated with various types of clamps (Poppen-Blalock, Selverstone, Crutchfield), some of whom have not been adequately monitored to ensure that the aneurysm has been completely obliterated following carotid artery occlusion. (thejns.org)
  • T raumatic carotid artery dissection is a diagnosis that has received significant discussion in the neurosurgical and trauma literature. (thejns.org)
  • 13 Appropriate early diagnosis and treatment of traumatic carotid artery dissection require a high index of suspicion to optimize outcome. (thejns.org)
  • T he common carotid artery bifurcation usually lies at the level of the C-4 vertebra or the upper border of the thyroid cartilage, 2 but it may occur as low as the level of the T-3 vertebra 8 or as high as the hyoid bone. (thejns.org)
  • instead, the external and internal carotid arteries arise directly from the innominate artery or the aortic arch. (thejns.org)
  • It is extremely rare that the common carotid artery ascends in the neck without undergoing bifurcation. (thejns.org)
  • A neurysms arising from the internal carotid artery (ICA) between the site of emergence of the carotid artery from the roof of the cavernous sinus and the origin of the posterior communicating artery (PCoA) have traditionally been termed "ophthalmic artery aneurysms" since the ophthalmic artery is the chief vessel arising from this segment. (thejns.org)
  • 1, 3, 4, 7, 8, 11 It is clear, however, that aneurysms arising from this portion of the carotid artery are heterogeneous in terms of site of origin, projection, and relationship to the bone and dura of the skull base. (thejns.org)
  • series of patients suspected of having carotid artery disease. (thejns.org)
  • The posterior communicating artery is given off as a branch of the internal carotid artery just before it divides into its terminal branches - the anterior and middle cerebral arteries. (wikipedia.org)
  • Relevance: To date, several large international studies have shown the benefit of surgical method of correction of hemodynamic stenosis of the internal carotid artery (ICA) - operation carotid endarterectomy (CEA). (ascvts2018.org)
  • Technically it was a change of direction cut when clipping of the ICA from the bifurcation of the common carotid artery, thus the area of the carotid sinus was left intact. (ascvts2018.org)
  • The carotid sinus is a collection of sensors in the carotid artery. (skybrary.aero)
  • It helps to regulate the flow of blood through the main artery in the neck, called the carotid artery, and into the brain. (skybrary.aero)
  • Communicating branches between the sympathetic plexus on the internal carotid artery and the abducens nerve have been exposed and the ophthalmic sympathetic nerve (2) traced onto the ophthalmic artery. (stanford.edu)
  • The course of the internal carotid artery (13) is seen in relation to the sella turcica (12). (stanford.edu)
  • The doctor will put pressure on your carotid sinus, a bundle of nerves surrounding the carotid artery in your neck just below your jaw. (webmd.com)
  • Internal Carotid Artery 14. (slideshare.net)
  • Caused bu ipsilateral Carotid stenosis or embolization of the retinal artery. (kumc.edu)
  • The lacerum, cavernous, and clinoid segments of the internal carotid artery are exposed here. (neurosurgicalatlas.com)
  • The carotid sympathetic plexus is visible as a perivascular plexus on the surface of the internal carotid artery. (neurosurgicalatlas.com)
  • This artery, a branch off the supraclinoid segment of the internal carotid artery, courses with the optic nerve through the optic canal to the orbit. (neurosurgicalatlas.com)
  • The aim of this study was to study sphenoid sinus proximity with carotid artery and the optic nerve using computerized tomographic imaging. (kowsarpub.com)
  • The images were studied regarding any bulging, as well as not having a bone covering in sphenoid sinus regarding internal carotid artery and optic nerve. (kowsarpub.com)
  • According to the reports of CT scan images, the existence of bulging as a result of internal carotid artery and uncovered artery were 4.22% and 5.8% in the right sinus, 4.9% and 5.4% in the left sinus, and 4.34% and 4.6% in both sinuses, respectively. (kowsarpub.com)
  • There are many vital vascular and nervous structures near the sphenoid including internal carotid artery, which plays an important role in supplying the brain and eyes. (kowsarpub.com)
  • Internal carotid artery is so close to the body and forms a track on it called carotid ( 4 ). (kowsarpub.com)
  • She also presented carotid sinus syndrome that was also extremely rare among CBT patients. (thefreedictionary.com)
  • Carotid sinus syndrome is a temporary loss of consciousness that sometimes accompanies convulsive seizures because of the intensity of the carotid sinus reflex when pressure builds in one or both carotid sinuses. (wikipedia.org)
  • Neurological complications following carotid sinus massage for diagnosis of the carotid sinus syndrome are uncommon and usually transient. (nih.gov)
  • Carotid body tumor presenting with carotid sinus syndrome. (thefreedictionary.com)
  • The sick sinus syndrome is a disease of the sinus node and occurs in middle-aged and older patients, with some exceptions. (springer.com)
  • In the section The Full Picture' the carotid sinus syndrome, which is different from the sick sinus syndrome, is briefly discussed. (springer.com)
  • The sick sinus syndrome. (springer.com)
  • Update on sick sinus syndrome, a cardiac disorder of aging. (springer.com)
  • Clinical spectrum of the sick sinus syndrome. (springer.com)
  • Hoffmann A, Kappenberger L, Jost M, Burckhardt D. Effect of amiodarone on sinus node function in patients with sick sinus syndrome. (springer.com)
  • Carotid sinus syndrome and falls in older adults. (springer.com)
  • Gurtner HP, Lenzinger HR, Dolder M. Clinical aspects of the sick sinus syndrome. (springer.com)
  • Alt E, Lehmann G. Stroke and atrial fibrillation in sick sinus syndrome. (springer.com)
  • Prospective randomized trial of atrial versus ventricular pacing in sick sinus syndrome. (springer.com)
  • Deleterious effects of long-term single-chamber ventricular pacing in patients with sick sinus syndrome: the hidden benefits of dual-chamber pacing. (springer.com)
  • Anatomy of the carotid sinus nerve and surgical implications in carotid sinus syndrome. (springermedizin.at)
  • Carotid sinus syndrome is common in dementia with Lewy bodies and correlates with deep white matter lesions. (semanticscholar.org)
  • When hypersensitivity is accompanied by a brief blackout that results in a fall it is known as carotid sinus syndrome . (medicalnotes.info)
  • Diagnosis of carotid sinus syndrome(CSS) is made when there is an asystole of >3 s and/or a fall in systolic blood pressure of >50 mmHg during carotid sinus massage together with reproduction of spontaneous symptoms. (explainmedicine.com)
  • Background Carotid sinus syndrome has been reported recently to be associated with chronic denervation of the sternocleidomastoid muscles. (ahajournals.org)
  • 2 3 4 5 Although the pathophysiology of this syndrome remains incompletely understood, interest in carotid sinus syndrome has been rekindled by the evidence of an association between carotid sinus syndrome and peripheral denervation of the sternocleidomastoid muscles. (ahajournals.org)
  • This condition is known as carotid sinus syndrome. (skybrary.aero)
  • Carotid sinus syndrome is very rare in people who are under 40 years of age. (skybrary.aero)
  • In cardio-inhibitory Carotid Sinus Syndrome (CI-CSS), syncopal recurrence is expected to occur in up to the 20% of patients after pacing therapy. (onlinejacc.org)
  • A dilated area located at the bifurcations of the carotid arteries and containing numerous baroreceptors that function in the control of blood pressure by mediating changes in the heart rate. (thefreedictionary.com)
  • The carotid sinus contains numerous baroreceptors which function as a "sampling area" for many homeostatic mechanisms for maintaining blood pressure. (wikipedia.org)
  • The carotid sinus baroreceptors are innervated by the carotid sinus nerve, which is a branch of the glossopharyngeal nerve (CN IX). (wikipedia.org)
  • Stimulation of baroreceptors at the carotid sinus can be used to treat resistant hypertension via activation of the baroreflex. (wikipedia.org)
  • Carotid sinus reflex death is a potential etiology of sudden death in which manual stimulation of the carotid sinus allegedly causes strong glossopharyngeal nerve (Vagus nerve is for aortic arch baroreceptors) impulses leading to terminal cardiac arrest. (wikipedia.org)
  • It carries impulses from the baroreceptors in the carotid sinus to the vasomotor center in the brainstem (to help maintain a more consistent blood pressure) and from chemoreceptors in the carotid body (mainly monitoring blood gas PaO2 and PaCO2 levels). (wikipedia.org)
  • The branch of the glossopharyngeal nerve to the carotid sinus is the nerve which primarily receives information from baroreceptors to help maintain a more consistent blood pressure . (bionity.com)
  • Persistent hypotension can be caused by the effect of the stent on the carotid sinus baroreceptors (Trocciola et al. (thefreedictionary.com)
  • 4. It is concluded that when renin production rate is high carotid baroreceptors exert little control over renin release, just as when renin production is low. (clinsci.org)
  • Signal transduction of aortic and carotid sinus baroreceptors is not modified by central command during spontaneous motor activity in decerebrate cats. (semanticscholar.org)
  • Effects of epinephrine on firing characteristics of two functionally different types of carotid baroreceptors. (semanticscholar.org)
  • Carotid baroreceptors play an important role in the blood pressure homeostasis. (explainmedicine.com)
  • events such as wearing garments with tight collar around neck, turning head, feeling for carotid pulse etc can stimulate the hypersensitive carotid baroreceptors and bring about symptoms. (explainmedicine.com)
  • CSS is condition that results due to hypersensitivity of the carotid baroreceptors to mildest stimulation. (explainmedicine.com)
  • It has long been suggested that the two arterial baroreceptors, aortic and carotid baroreceptors, have different pressure sensitivities. (frontiersin.org)
  • The present study therefore provides for a basic physiological understanding on the pressure sensitivity of the two baroreceptor neurons and suggests that aortic baroreceptors have a higher pressure sensitivity than carotid baroreceptors. (frontiersin.org)
  • There are two arterial baroreceptors, namely, the aortic baroreceptors and carotid baroreceptors, located in the adventitia layer of the aortic arch and carotid arteries, respectively. (frontiersin.org)
  • The nerve signals from the carotid baroreceptors travel along carotid sinus nerves (CSN) to their soma localized in the petrosal ganglion (PG). (frontiersin.org)
  • We investigated the course of arterial BP level and variability after bilateral denervation of the carotid sinus baroreceptors in humans. (ru.nl)
  • The implant includes sampling and pulse stimulation electrodes (44) preferably located on the carotid sinus nerve branch of the glossopharyngeal nerve, adjacent and distal to the carotid sinus baroreceptors. (google.es)
  • Among the neutrally mediated investigations, the tilt-test and carotid sinus massage are the most useful. (thefreedictionary.com)
  • A tachycardia that terminates abruptly with a vagal manoeuvre, such as carotid sinus massage, confirms an AV nodal-dependent arrhythmia, i. (thefreedictionary.com)
  • Medical literature examining the use of carotid sinus massage involving brief gentle pressure of the carotid sinus in therapeutic settings as a diagnostic and therapeutic examination tool have reported few potentially fatal complications. (wikipedia.org)
  • A carotid massage can also possibly dislodge a thrombus, or some plaque. (wikipedia.org)
  • Carotid Sinus Massage in the Echocardiography Laboratory. (biomedsearch.com)
  • In this article, we discuss the use of carotid sinus massage (CSM) in the echocardiography laboratory as a maneuver to reduce the resting heart rate and thus render the transmitral Doppler signal more amenable to analysis. (biomedsearch.com)
  • To review the incidence of neurological complications occurring after carotid sinus massage performed for diagnostic purposes. (nih.gov)
  • Carotid sinus massage performed for 5 seconds in both supine and erect postures, both before and after atropine. (nih.gov)
  • Contraindications to carotid sinus massage were the presence of carotid bruits, recent myocardial or cerebral ischemia, or previous ventricular tachyarrhythmias. (nih.gov)
  • Contraindications to carotid sinus massage should be respected and the standardized technique used. (nih.gov)
  • I was remembering that no matter how well I tried to teach those amazing nurses how to massage his carotid sinus , his heart responded only to my touch. (thefreedictionary.com)
  • Carotid sinus massage or adenosine may terminate an antidromic AVRT. (thefreedictionary.com)
  • Life threatening cervico-mediastinal haematoma after carotid sinus massage. (thefreedictionary.com)
  • Right and left carotid sinus massage and the diving reflex were considerably less effective than the valsalva manoeuvre. (bestbets.org)
  • Ventricular fibrillation , monoplegia, hemiplegia, and cervicomediastinal haematoma are reported complications of carotid sinus massage. (bestbets.org)
  • Carotid sinus massage (CSM) was performed both supine and during 60° head-up tilt. (bmj.com)
  • It is defined as a ≥50 mmHg drop in systolic BP & / or ≥3 second asystole in response to carotid sinus massage (CSM). (ahajournals.org)
  • She exhibited a cardioinhibitory carotid sinus hypersensitivity after right carotid sinus massage (CSM), but without evidence of orthostatic hypotension. (semanticscholar.org)
  • Carotid sinus massage, or simply carotid massage, is a simple bedside manoeuvre that helps to clarify the type and sometimes also the mechanism of different heart rhythm disturbances. (medicalnotes.info)
  • Carotid sinus massage is a procedure that is used to investigate unexplained dizziness, falls or faints where they are suspected to be due to heart rhythm problems. (medicalnotes.info)
  • Carotid sinus massage is also an important diagnostic procedure in patients with suspected hypersensitivity of the carotid sinus. (medicalnotes.info)
  • Massage of the carotid sinus is contraindicated in patients with diseased carotid arteries because of the risk of cerebrovascular accident. (medicalnotes.info)
  • In rare instances, carotid sinus massage may initiate ventricular tachycardia. (medicalnotes.info)
  • The physician decides to perform carotid massage and is giving instructions to his senior registrar on how to perform the carotid massage. (medicalnotes.info)
  • Never massage both carotids simultaneously. (medicalnotes.info)
  • a carotid sinus massage may be carried out. (medicalnotes.info)
  • Both carotids should be confirmed to be pulsatile in advance before the massage is done. (medicalnotes.info)
  • Auscultation of the carotid arteries is also essential before the massage test can be considered. (medicalnotes.info)
  • The real-world cousin of the Vulcan nerve pinch , carotid sinus massage is used diagnostically to evaluate vagus nerve function and therapeutically to control tachyarrhythmia s. (everything2.com)
  • In normal people, massage of said sinus results in bradycardia (and hypotension )-the baroreceptor reflex , which normal ly acts to correct rapid changes in blood pressure ( eg the drop associated with standing suddenly , in which case the reflex acts to increase the blood pressure). (everything2.com)
  • Carotid massage or slight pressure at the carotid sinus will reproduce the symptoms and signs of CSS. (explainmedicine.com)
  • Diagnosis can be made with carotid massage in a head-up tilt position with blood pressure and ECG monitoring, with hypotension being a positive result. (livesstar.com)
  • Carotid sinus massage was performed in all patients by the same physician (J.-J.B.) in a quiet room (usually devoted to head-up tilt test). (ahajournals.org)
  • This study examined the efficacy of new delta carotid sinus massage (CSM) versus conventional CSM (CM). (bvsalud.org)
  • Carotid massage can cause a stroke, especially if you're older or you've had a stroke in the last 3 months. (webmd.com)
  • Patients have undergone carotid sinus massage, and ILR implantation. (clinicaltrials.gov)
  • In addition to cold water in the face, other types of vagal maneuvers include holding your breath while bearing down (also known as the Valsalva maneuver ), knee-to-chest compressions, hard coughing and carotid sinus massage. (secondscount.org)
  • Carotid sinus massage should never be undertaken without a doctor's approval. (secondscount.org)
  • This study examined the value of bedside carotid sinus massage and atropine administration in diagnosing the site of block from the standard electrocardiogram in subjects with chronic A-V block and narrow QRS complexes. (elsevier.com)
  • The noninvasive bedside method of carotid sinus massage and the use of atropine permit both the localization and the determination of the type of block in the majority of cases of second degree A-V block and narrow QRS complexes. (elsevier.com)
  • Recently, there have been studies of the effect of stimulation of the carotid sinus nerve for the treatment of hypertension. (thefreedictionary.com)
  • The carotid branch of the glossopharyngeal nerve (carotid sinus nerve or Hering's nerve) is a small branch of the glossopharyngeal nerve that innervates the carotid sinus and carotid body. (wikipedia.org)
  • It uses material from the Wikipedia article "Branch_of_glossopharyngeal_nerve_to_carotid_sinus" . (bionity.com)
  • These same doses were found to greatly augment the spontaneous electrical firing of the carotid sinus nerve, and this neural activation was closely related in time to the observed cardiovascular effects. (aspetjournals.org)
  • Intravenous administration of acetylstrophanthidin (12.5 and 25.0 µg/kg) was also found to activate the carotid sinus reflexes as an increase in sinus nerve activity occurred which coincided with cardiovascular effects, most notable of which was a decrease in contractile force. (aspetjournals.org)
  • The superior bulge of the optic nerve extends near the roof horizontally from posterior to anterior in the superolateral part of the sphenoid sinus and usually disapears gradually toward the anterior wall (Figure, B & C). The bony covering of the optic nerve is usually seen and it is dehiscent in 4 to 6% of cases. (thefreelibrary.com)
  • The carotid sinus is innervated by the sensory branch of the glossopharyngeal nerve (sinus nerve, Hering's nerve). (thefreedictionary.com)
  • Excitation of the nerve endings in the carotid sinus is the first link in the chain of the carotid reflexes. (thefreedictionary.com)
  • Phase resetting of the respiratory oscillator by carotid sinus nerve stimulation in cats. (umassmed.edu)
  • Cardiac sequelae of inappropriate activation of vasomotor centers in the carotid sinus from cranial nerve dysfunction have the potential for morbid consequences. (pubmedcentralcanada.ca)
  • These data demonstrate that carotid chemoreceptor activation attenuates the reflex hypotension caused by combined electric stimulation of the carotid sinus and the carotid sinus nerve in conscious rats. (ahajournals.org)
  • Electroanatomical mapping of the right atrium with identification of phrenic nerve course was performed (Figure 1 A). Anterior right CNA (35 W, 43°C, 2 min and 40 s of RF delivery) at the level of the septal aspect of the superior vena cava determined a shortening of the basal sinus cycle length (from 975 ms to 730 ms). Vagal stimulation by manual CSM did not cause any pause. (termedia.pl)
  • The carotid sinus nerve (CSN) is important for regulation of blood pressure (BP) and heart rate. (springermedizin.at)
  • The effects of CEA on the mechanical properties of the carotid sinus and carotid sinus nerve activity in atherosclerotic patients. (springermedizin.at)
  • To elucidate the mechanism by which stimulation of the carotid sinus nerves prolongs the R-R interval, the effects of activating an implanted carotid sinus nerve stimulator were studied in eight patients at varying levels of background autonomic activity and with varying types of efferent autonomic blockade. (ahajournals.org)
  • The sinus nerve or sympathetic trunk was stimulated unilaterally in one group of adult cats or Syrian hamsters while in another group the sinus nerve or sympathetic trunk was cut unilaterally and the animals were given reserpine. (rupress.org)
  • In a third group, atropine was administered prior to sinus nerve stimulation. (rupress.org)
  • After sinus nerve stimulation alone, the density of the granules in the glomus cells was decreased, but changes were not noted in the granules following sympathetic nerve stimulation. (rupress.org)
  • Sinus nerve stimulation after atropine administration resulted in no change in granule density. (rupress.org)
  • Sinus nerve transection followed by reserpine treatment resulted in a greater decrease in granule density on the unoperated than on the operated side. (rupress.org)
  • These results suggest that the sinus nerve must be intact for reserpine to exert an effect and that the sinus nerve may contain efferent fibers which modulate amine secretion. (rupress.org)
  • Carotid sinus nerve denervation (CSD) has recently been shown to relieve hypertension and reduce sympathetic activity in other rat models of hypertension. (ox.ac.uk)
  • We have previously shown that carotid sinus nerve denervation (CSD) reduces arterial blood pressure (ABP) in SHR. (ox.ac.uk)
  • Abolishment of CB activity was performed through the resection of CB sensitive nerve, the carotid sinus nerve (CSN. (ul.pt)
  • The significance of a sympathetic efferent nerve supply, vasoconstrictor to the carotid body and hence facilitatory to carotid chemoreceptors, is well understood. (elsevier.com)
  • The significance of a second efferent pathway, whose impulses, passing down the sinus nerve, are inhibitory to the chemoreceptors, is less certain. (elsevier.com)
  • Activity in these sinus nerve efferents is increased by injection of pressor agents, by hypoxia, by hypercapnia, by application of alkaline solutions to the ventral medulla, and by severe hypocapnia. (elsevier.com)
  • Sinus nerve efferents can also be activated reflexly by stimulating ipsilateral carotid chemoreceptors. (elsevier.com)
  • Stimulation of nociceptive endings in the heart has reciprocal effects on sinus nerve efferents and sympathetic efferents to the carotid body, inhibiting the former and stimulating the latter. (elsevier.com)
  • Recent results are cited which indicate that the responses of sinus nerve efferents to changes in blood pressure are more variable than is generally believed, and that the conventional explanation of the relationship between sinus efferent activity and arterial pressure needs to be revised. (elsevier.com)
  • The carotid sinus is a small bundle of nerve endings situated next to the carotid arteries in the neck. (medicalnotes.info)
  • In New Zealand white rabbits, cholera-toxin HRP was injected into the carotid sinus nerve just proximal to the carotid sinus. (edu.au)
  • In anesthetized rats, increases in phrenic nerve (PN) amplitude and frequency during brief periods of hypoxia or electrical stimulation of the carotid sinus nerve (CSN) are followed by an increase in expiratory duration. (unthsc.edu)
  • Ilyinsky, O & Mifflin, S 2005, ' Chronic hypoxia abolishes expiratory prolongation following carotid sinus nerve stimulation in the anesthetized rat ', Respiratory Physiology and Neurobiology , vol. 146, no. 2-3, pp. 269-277. (unthsc.edu)
  • 5 . The system according to claim 4 , wherein said nerve is a carotid sinus nerve branch of a glossopharyngeal nerve. (google.es)
  • Sec. 870.3850 Carotid sinus nerve stimulator. (fda.gov)
  • A carotid sinus nerve stimulator is an implantable device used to decrease arterial pressure by stimulating Hering's nerve at the carotid sinus. (fda.gov)
  • Any other carotid sinus nerve stimulator shall have an approved PMA or a declared completed PDP in effect before being placed in commercial distribution. (fda.gov)
  • According to the reports of CT scan images, existence of bulging as a result of optic nerve and uncovered nerve were 5.7% and 4.3% in the right sinus, 6% and 5.4% in the left sinus, and 12% and 3.2% in both sinuses, respectively. (kowsarpub.com)
  • These results demonstrate that the digitalis preparations studied can directly activate the carotid sinus baroreceptor mechanism and that this activation is a major determinant of their cardiovascular effects. (aspetjournals.org)
  • 1. Carotid baroreceptor manipulation (neckchamber technique) and passive head-up tilting were used in ten patients with renovascular hypertension and in five subjects with essential hypertension under diuretic treatment to study reflex control of renin secretion" at high basal-renin production rates. (clinsci.org)
  • 2. Reflex effects of carotid baroreceptor manipulation on renin secretion were only minor. (clinsci.org)
  • Hypotension and hypertension as consequences of baroreceptor dysfunction following carotid endarterectomy. (springermedizin.at)
  • It is concluded that the prolongation of the R-R interval produced by stimulation of the carotid sinus nerves is secondary to augmented parasympathetic activity, and the attenuation of this response during erect exercise appears to be due to a centrally mediated reduction in the responsiveness of the parasympathetic nervous system to baroreceptor stimuli. (ahajournals.org)
  • Low-pressure-sensitive baroreceptor fibers recorded from rabbit carotid sinus nerves. (semanticscholar.org)
  • Carotid sinus baroreceptor reflex control and epinephrine. (elsevier.com)
  • To quantify the importance of the carotid sinus baroreceptor reflex and the interaction with epinephrine infusion on total pulmonary vascular capacity and resistance, I have simultaneously measured total pulmonary vascular compliance, changes in pulmonary blood volumes, and changes in resistances in seven sodium pentobarbital-anesthetized dogs. (elsevier.com)
  • Furthermore, aortic baroreceptor neurons show a lower pressure threshold than that of carotid baroreceptor neurons. (frontiersin.org)
  • Secondly, uniaxial stretching of baroreceptor neurons, that mimics the forces exerted on blood vessels, elicited a larger increase in intracellular Ca 2+ rise in aortic baroreceptor neurons than in carotid baroreceptor neurons. (frontiersin.org)
  • Therefore, in contrast to earlier experimental observations, the compensatory ability of the baroreceptor areas outside the carotid sinus seems to be of limited importance in the regulation of BP in humans. (ru.nl)
  • Moreover, alteration of the carotid sinus pressure resulting from neck palpation or electric stimulation may cause carotid baroreflex (Filippone & Bisognano, 2007). (thefreedictionary.com)
  • Electric carotid baroreflex activation has been used to treat patients with resistant hypertension. (ahajournals.org)
  • 1 , 2 The rationale for supporting this approach is that electric activation of the carotid baroreflex leads to activation of the cardiac parasympathetic drive and inhibition of sympathetic activity to the heart and peripheral vessels. (ahajournals.org)
  • The hypothesis that rapid resetting of one carotid sinus baroreflex might influence responses from the other side was also tested. (mcw.edu)
  • METHODS AND RESULTS: We studied 4 women (age 41 to 63 years) who were referred for evaluation of arterial baroreflex function because of clinical suspicion of carotid sinus denervation attributable to bilateral carotid body tumor resection. (ru.nl)
  • The purpose of this study was to determine the effect of cholecystokinin octapeptide ( CCK-8 ) on carotid sinus baroreflex in 36 anesthetized male rats by isolated carotid sinus perfusion in vivo. (bvsalud.org)
  • Among the functional parameters of carotid sinus baroreflex , the changes in RD, PS and TP were dose -dependent. (bvsalud.org)
  • An implantable device (20) uses the carotid baroreflex in order to control systemic blood pressure. (google.es)
  • What is a Carotid Cavernous Fistula? (upmc.com)
  • Carotid cavernous fistula treatments vary depending on the type of CCF. (upmc.com)
  • coccygeal sinus a sinus or fistula just over or close to the tip of the coccyx. (thefreedictionary.com)
  • Re: Prediction of traumatic carotid-cavernous sinus fistula. (lww.com)
  • Summary: We report the endovascular treatment of a dural carotid cavernous fistula in a 67-year-old woman in whom superior petrosal sinus catheterization was performed to access the venous site of the fistula. (ajnr.org)
  • The site of the fistula was identified at the posterosuperior margin of the right cavernous sinus (CS). (ajnr.org)
  • Carotid cavernous sinus fistula closure following angiography. (thejns.org)
  • 1637 - 1639 , 1973 Bennett DR, Van Dyk HJL, Davis DO: Carotid cavernous sinus fistula closure following angiography. (thejns.org)
  • Bennett DR, Van Dyk HJL, Davis DO: Carotid cavernous sinus fistula closure following angiography. (thejns.org)
  • External carotid-cavernous fistula in an infant. (thejns.org)
  • 351 - 356 , 1981 Biglan AW, Pang D, Shuckett EP, et al: External carotid-cavernous fistula in an infant. (thejns.org)
  • We describe a novel clinical application of OCTA in a patient with dural carotid-cavernous sinus fistula (CCF), which was complicated by increased intra-ocular pressure (IOP). (biomedcentral.com)
  • A carotid-cavernous fistula developed in a 62-year-old woman during an attempt at embolization of a skull base meningioma. (elsevier.com)
  • Horton, J. A. / Iatrogenic carotid-cavernous fistula occurring after embolization of a cavernous sinus meningioma . (elsevier.com)
  • 2) The bulge usually runs obliquely from inferior to superior in the lateral wall of the sphenoid sinus (Figure, B). In extreme cases, the carotid bulge is prominent, and the bulges in both carotid arteries almost make contact in the midline (Figure, D). (2) The bulges can occupy most of the sphenoid sinus. (thefreelibrary.com)
  • Sinus node coronary arteries studied with angiography. (springer.com)
  • Much of this literature has been devoted particularly to the patency of the common and internal carotid arteries, and to the technic of arteriography, which has allowed adequate investigation of these vessels. (annals.org)
  • Another means of studying the cerebral circulation-manual compression of the carotid arteries-has received somewhat less comment. (annals.org)
  • Light microscopic examination showed that the carotid rete branches were medium-sized, muscular arteries. (iastate.edu)
  • There are 2 carotid arteries, one on each side of the neck, which provide the main blood supply to the brain and scalp. (medicalnotes.info)
  • Calcification of atheromatous plaque of the carotid arteries is a common condition seen in Pans and CBCTs in about 5% of adults over 40 years but can reach 60% in patients with chronic renal disease. (metrowestorthoperio.com)
  • The common carotid bifurcation in the neck and the internal carotid arteries of the cavernous sinus are frequently affected. (metrowestorthoperio.com)
  • Blood flows up to the brain through the vertebral arteries and through the internal carotid arteries. (wikipedia.org)
  • The left and right internal carotid arteries arise from the left and right common carotid arteries. (wikipedia.org)
  • An acquired or spontaneous abnormality in which there is communication between cavernous sinus , a venous structure, and the carotid arteries . (lookfordiagnosis.com)
  • Materials and methods:the study included 412 patients operated on carotid arteries to the Chelyabinsk regional clinical hospital from 2010 to 2017. (ascvts2018.org)
  • This maneuver should not be tried in older people who may have blockages in the neck arteries that carry blood to the brain (the carotid arteries). (secondscount.org)
  • The anterior cerebral arteries, terminal branches of the internal carotid arteries, are just visible at the top of the image entering the interhemispheric fissure. (neurosurgicalatlas.com)
  • A likely explanation for the irregularity is that the P-P interval is prolonged by an increase in parasympathetic tone and a decrease in sympathetic tone resulting reflexly from stimulation of the carotid sinus by systolic ejection. (thefreedictionary.com)
  • Stimulation of the carotid sinus via a slap or a strike, to induce (usually temporary, but sometimes lethal) loss of consciousness is a theatrical self-defense technique, and is often taught in martial arts such as karate. (wikipedia.org)
  • Electric stimulation of the carotid sinus has been used recently in clinical trials to treat hypertensive patients resistant to pharmacological therapy. (ahajournals.org)
  • 3 More recently, electric stimulation of the carotid sinus has emerged as a therapeutic tool in the management of heart failure as well. (ahajournals.org)
  • During electric stimulation of the carotid sinus in patients with resistant hypertension 1 , 2 or with heart failure, 4 - 6 the anatomic position of the carotid body may allow undesirable activation of the carotid chemoreceptors, a possibility raised by Zucker et al 7 and based on studies in dogs with heart failure. (ahajournals.org)
  • Carotid sinus hypersensitivity (CSH) is an exaggerated fall in blood pressure (BP) or heart rate (HR) in response to stimulation of the carotid sinus. (ahajournals.org)
  • With moderate treadmill exercise, stimulation of the carotid sinus nerves prolonged the R-R interval by only 40 ± 30 msec prior to blocking drugs, 62 ± 19 msec after propranolol, and 40 ± 30 msec after propranolol and atropine. (ahajournals.org)
  • This means that any physical stimulation of the carotid sinus can cause a sudden drop in blood pressure, resulting in fainting. (skybrary.aero)
  • The aim of our study was to investigate whether dissection of the carotid bifurcation during eversion carotid endarterectomy (eCEA) causes a histologically proven compromise of the CSN and how the postoperative BP was affected thereby. (springermedizin.at)
  • In all patients, histological specimens of the periadventitial tissue within the carotid bifurcation were taken during eCEA. (springermedizin.at)
  • Nerval structures of the CSN within the carotid bifurcation were detected by immunohistochemistry. (springermedizin.at)
  • Dural carotid cavernous fistulas (DCCFs) are a rare cause of eye redness. (ajnr.org)
  • An anatomical-angiographic classification for carotid-cavernous sinus fistulas is introduced and a series of 14 patients with spontaneous carotid-cavernous sinus fistulas is reviewed to illustrate the usefulness of such a classification for patient evaluation and treatment. (thejns.org)
  • The anatomy, clinical manifestations, angiographic evaluation, indications for therapy, and therapeutic options for spontaneous carotid-cavernous sinus fistulas are discussed. (thejns.org)
  • Carotid-cavernous sinus fistulas (CCF) result from abnormal connections between the carotid arterial system and the cavernous sinus, leading to ophthalmic complications due to arterialization of the ocular venous system [ 7 ]. (biomedcentral.com)
  • Traumatic carotid-cavernous fistulas (CCFs) present the clinician with diagnostic and surgical challenges. (epistemeparkour.com)
  • Several cranial nerves course through this sinus. (thefreedictionary.com)
  • No depression in these parameters occurred when these drugs were administered to animals with sectioned carotid sinus nerves. (aspetjournals.org)
  • No depression in contractile force was noted when this agent was administered to animals with sectioned carotid thnus nerves. (aspetjournals.org)
  • The most popular of the angiosurgeons today is eversion technique, however, the standard implementation is inevitable trauma of the carotid sinus nerves, which in turn has a negative impact on the autonomic regulation of vascular tone and arterial hemodynamics with a tendency to hypertension. (ascvts2018.org)
  • Objective: In our work we propose to use a modification of eversion CEA is associated with preservation of the nerves of the carotid sinus and to evaluate its effectiveness by comparing the immediate results with a control group of patients with standard scheme surgery. (ascvts2018.org)
  • The first group included 237 patients with standard methods of the eversion technique - the intersection of the nerves of the carotid sinus. (ascvts2018.org)
  • Interaction of right and left carotid sinus baroreflexes in the dog. (mcw.edu)
  • The right and left carotid sinus regions were isolated and perfused at controlled pressures. (mcw.edu)
  • Pressure in the right and left carotid sinuses were independently varied, and the resulting steady-state reflex changes in arterial pressure, heart rate, respiratory frequency, tidal volume, and total ventilation were measured. (mcw.edu)
  • Right carotid sinus gain was found to be 0.628 +/- 0.058 at a left carotid sinus pressure of 50 mmHg and 0.148 +/- 0.027 when left carotid sinus pressure was 200 mmHg. (mcw.edu)
  • Similar results were found for left carotid sinus gain. (mcw.edu)
  • An additional inhibitory summation between the right and left carotid sinuses was found such that simultaneous excitation of both receptors resulted in a smaller reflex response than did the sum of individual responses. (mcw.edu)
  • Diseases of the Sinuses: Diagnosis and Management. (thefreelibrary.com)
  • Indications for electrophysiologic testing in the diagnosis and assessment of sinus node dysfunction. (springer.com)
  • petrosal sinus, inferior a venous channel arising from the cavernous sinus and draining into the internal jugular vein. (thefreedictionary.com)
  • particularly in the internal jugular nodes.Carotid Space: This is another major highway through which tumors can race vertically up and down from the skull base down to the aortic arch. (scribd.com)
  • A , Arterial-phase right internal carotid arteriogram shows the DCCF at the right posterosuperior aspect of the CS ( solid arrow ) fed by dural branches of the carotid siphon. (ajnr.org)
  • At the extreme range of the movements, the geometrical compliance of the carotid sinus is limited and significant stress concentrations appear just distal to the sinus with peak stresses at the internal wall on the posterior side of the vessel following maximum head rotation and on the anteromedial portion of the vessel wall following rotation and hyperextension. (uzh.ch)
  • cavernous sinus an irregularly shaped venous channel between the layers of dura mater of the brain, one on either side of the body of the sphenoid bone and communicating across the midline. (thefreedictionary.com)
  • Several structures can bulge into the sphenoid sinus. (thefreelibrary.com)
  • Depending on the degree of pneumatization of the sphenoid sinus, these bulges can be either barely noticeable or quite obvious. (thefreelibrary.com)
  • 1.) Yanagisawa E. Endoscopic view of sphenoid sinus cavity. (thefreelibrary.com)
  • Sphenoid septal attachment to the ICA protuberance within the sphenoid sinus was found to be one of the anatomical risk factors for ICA injury during transsphenoidal surgery. (termedia.pl)
  • Out of 100 sphenoid sinuses, 49 (49%) had at least one septum inserted at the ICA prominence. (termedia.pl)
  • Blind instrumentation of sphenoid sinus could result in an injury to the carotid. (sinusvideos.com)
  • Extension of a CCF into the sphenoid sinus presents additional management difficulties. (epistemeparkour.com)
  • Sphenoid sinus is surrounded by many vital vascular and nervous structures. (kowsarpub.com)
  • In more than 20% of patients with chronic sinusitis, involvement of sphenoid sinus has been observed. (kowsarpub.com)
  • Besides, sphenoid sinus is an appropriate route to access anterior and middle cranial fossa in surgery. (kowsarpub.com)
  • Therefore, it is important to have an adequate knowledge about the contents of sphenoid sinus and its proximity for nasal endoscopy, sinus surgeries and neurosurgeries. (kowsarpub.com)
  • In this prospective study, computerized tomographic images of sphenoid sinus of patients referred to Imam Khomeini and Apadana hospitals were studied. (kowsarpub.com)
  • Among 468 coronal and axial CT scan images of sphenoid sinus, 365 (78%) showed post-sellar pneumatization and 103 (22%) pre-sellar pneumatization. (kowsarpub.com)
  • Due to variability of sphenoid sinus pneumatization and the separator blade of the two sinus cavities, careful attention is required during sinus surgery to avoid damage to neural and vascular structures in its proximity. (kowsarpub.com)
  • Sphenoid sinus is the most unaccessible paranasal sinus. (kowsarpub.com)
  • cervical sinus a temporary depression in the neck of the embryo containing the branchial arches. (thefreedictionary.com)
  • coronary sinus the dilated terminal portion of the great cardiac vein, receiving blood from other veins draining the heart muscle and emptying into the right atrium. (thefreedictionary.com)
  • The others are of cardiac origin, orthostatic hypotension, carotid sinus hypersensitivity, neurological and endocrinological causes and psychiatric disorders. (frontiersin.org)
  • Carotid sinus hypersensitivity is most commonly found in men, at an older age, 2 as well as in the presence of arterial hypertension, diabetes mellitus, ischemic heart disease, 3 and carotid stenosis. (ajnr.org)
  • Sympathetic denervation of the carotid sinus region had no effect. (mcw.edu)
  • Experiments show that electric stimulation of efferent sympathetic pathways to the carotid sinus leads to blood pressure fall and decrease of the carotid sinus hypertensive reflex. (semanticscholar.org)
  • Transection of the sympathetic components to the carotid body followed by reserpine injections resulted in a decrease in granule density in the glomus cells on both the operated and unoperated sides. (rupress.org)
  • Results: In the group of patients who used the sinus-saving modification in the 1st day after operation was lower hemodynamic parameters: systolic, diastolic, pulse blood pressure and heart rate compared with the control group and a more significant decrease in sympathetic pressor impact on the rhythm. (ascvts2018.org)
  • frontal sinus one of the paired paranasal sinuses in the frontal bone, each communicating with the middle nasal meatus on the same side. (thefreedictionary.com)
  • maxillary sinus one of the paired paranasal sinuses in the body of the maxilla on either side, opening into the middle nasal meatus on the same side. (thefreedictionary.com)
  • Sinus paranasal (Paranasal sinuses). (thefreedictionary.com)
  • Anatomical Considerations: In addition to understanding basic anatomical structures such as the tongue, the tonsilar fossa, the epiglottis, the paranasal sinuses, the nasal cavity, and the larynx, one must also be aware of certain anatomical spaces which are delineated by fascial planes. (scribd.com)
  • Endoscopic Surgery of the Paranasal Sinuses and Anterior Skull Base. (thefreelibrary.com)
  • Long-term effects of carotid sinus denervation on arterial blood pressure in humans. (ru.nl)
  • The results (monitoring for heart rate and blood pressure) were classified as normal, doubtful, or hypersensitive carotid sinus. (ahajournals.org)
  • Some people can develop a hypersensitive carotid sinus. (skybrary.aero)
  • To determine the frequency, age distribution and clinical presentation of carotid sinus hypersensitivity (CSH) among 373 patients (age range 15-92 years) referred to two autonomic referral centres during a 10-year period. (bmj.com)
  • The carotid sinus has chemical and pressure receptors that provide information to the brain on blood flow and blood pressure. (medicalnotes.info)
  • The central nervous system, without any information about the contractile state of the muscles, interprets any information coming from the carotid sinus receptors only as an abrupt increase in blood pressure and reacts by a dramatic decrease in heart rate and/or blood pressure. (ahajournals.org)
  • The area near the jawline (called the carotid sinus ) has receptors that help maintain normal blood pressure. (secondscount.org)
  • Central venous cannulation--Stimulation of carotid sinus reflexes due to pressure from fingers during jugular vein cannulation and excess insertion of the central venous catheter into the right atrium may also lead to arrhythmias. (thefreedictionary.com)
  • Raiciulescu N, Bittman E, Voinescu S. [Influence of the mesencephalic reticular formation on carotid sinus baroceptor reflexes]. (umassmed.edu)
  • Mayer wave activity in vasodepressor carotid sinus hypersensitivity. (semanticscholar.org)
  • Carotid sinus stimulation may either cause a vasodepressor reaction or a predominant vasovagal reaction, or both. (livesstar.com)
  • It is hypothesized that, in conscious rats, combined activation of carotid baro- and chemoreceptors afferences attenuates the reflex hypotension. (ahajournals.org)
  • Denervation of carotid baro- and chemoreceptors in humans. (springermedizin.at)
  • Carotid bodies (CB) are peripheral chemoreceptors whose main stimulus is hypoxia, and it was proposed that they can act as glucose sensors implicated in energy homeostasis control. (ul.pt)
  • But, 5('-)-N was found in large quantities in the endothelial cells and the tunica adventitia of both the branches of the carotid rete and the cavernous sinus, though it was absent in the tunica media of the carotid rete branches. (iastate.edu)
  • Hypotension that result from carotid sinus stimulation leads to a transient brain hypoperfusion leading to loss of consciousness. (explainmedicine.com)
  • cerebral sinus one of the ventricles of the brain. (thefreedictionary.com)
  • At cerebral venography, the most distal aspect of the right SPS was identified at the point where it merged with the right transverse sinus ( Fig 2 ). (ajnr.org)
  • B , Right external carotid arteriogram shows that the DCCF is draining into the right superficial middle cerebral vein (a rrowheads ), the right SOV ( solid arrow ), and the right trigeminal vein ( open arrow ). (ajnr.org)
  • Cerebral infarction due to carotid occlusion and carbon monoxide exposure. (semanticscholar.org)
  • The neurons which innervate the carotid sinus centrally project to the solitary nucleus in the medulla of the brainstem. (wikipedia.org)
  • Control by the superior cervical ganglion of the state of contraction and pulsatile expansion of the carotid sinus arterial wall. (semanticscholar.org)
  • article{Kezdi1954ControlBT, title={Control by the superior cervical ganglion of the state of contraction and pulsatile expansion of the carotid sinus arterial wall. (semanticscholar.org)
  • The relationship of postoperative hypertension to complications following carotid endarterectomy. (springermedizin.at)
  • Conclusions: the practical application of the sinus-saving modification of eversion carotid endarterectomy allows to reduce the risk of postoperative hemodynamic complications associated with the instability of arterial hypertension. (ascvts2018.org)
  • CVRx said that the FDA clearance constitutes its first commercial approval in the United States, and is based on a determination by the FDA that neo legacy is safe and can be used in US patients who were defined as responders to the Rheos Carotid Sinus Lead System. (thefreedictionary.com)
  • Carotid sinus hypersensitivity [17] is more common in patients with fractured necks of femur (36%)--both cognitively impaired and cognitively normal than in patients admitted acutely for reasons other than falls (17%) or frail day-hospital attendees (13%) [18, 19]. (thefreedictionary.com)
  • Pacemakers cut the rate of fails in only the subgroup of patients who had cardioinhibitory carotid sinus hypersensitivity that induced sudden changes in heart rate and blood pressure, and they did not decrease the risk of falling in any patient group. (thefreedictionary.com)
  • 4 It follows that patients undergoing CA may have high rates of carotid hypersensitivity. (ajnr.org)
  • Patients with multiple septa and those having an incomplete septum were at higher risk of at least one of them being inserted at the ICA prominence within the sinus. (termedia.pl)
  • Fatal myocardial infarction following carotid endarterectomy: three hundred thirty-five patients followed 6-11 years after operation. (springermedizin.at)
  • 6 The present study was undertaken to determine (1) the prevalence of asymptomatic carotid sinus hypersensitivity in patients admitted in a cardiology department, (2) the prevalence of sternocleidomastoid muscle denervation in the same population, and most importantly, (3) the concordance between these two findings. (ahajournals.org)
  • The study group was recruited prospectively from patients admitted in the cardiology department and who were older than 50 years of age and in sinus rhythm. (ahajournals.org)
  • The second group consisted of 175 patients who were applied sinus-saving modification. (ascvts2018.org)
  • The complex was sectioned with the cryostat and several laboratory procedures were performed to detect the presence of alkaline phosphatase (A.P.), 5('-)-nucleotidase (5('-)-N) and adenosine triphosphatase (ATP-ase) enzymes;Gross study revealed that the carotid rete was supplied with blood by one caudal rete branch, and two to four rostral rete branches were thought to be normal. (iastate.edu)
  • circular sinus the venous channel encircling the pituitary gland, formed by the two cavernous sinuses and the anterior and posterior intercavernous sinuses. (thefreedictionary.com)
  • occipital sinus a venous sinus between the layers of dura mater, passing upward along the midline of the cerebellum. (thefreedictionary.com)
  • To our knowledge, this retrograde venous route via the superior petrosal sinus has not been previously described. (ajnr.org)
  • We report a case of a DCCF that was treated by embolization after venous retrograde access to the superior petrous sinus (SPS) was achieved. (ajnr.org)
  • Venous-phase lateral left common carotid arteriogram. (ajnr.org)
  • Unlike cardioinhibition, which results from an increase in vagal stimulation of the sinus node or AV node or both, vasodepression results from a decrease in sympathetically mediated arteriolar and/or venous vasoconstriction (Figure 1). (medscape.com)
  • These may cause mechanical dysruption to the carotid sinus region and cause carotid baroraceptor hypersentivity. (explainmedicine.com)
  • The pituitary gland rests within the sella turcica and is enclosed by dura mater containing intercavernous sinuses. (neurosurgicalatlas.com)
  • After 20 min, a new CSM showed suprahisian atrioventricular block with normal HV (RR max of 2608 ms) (Figure 1 B). Inferior right CNA (35 W, 43°C, 1 min and 30 s of RF delivery) posterior to the coronary sinus ostium was performed, in a region previously reported to be involved in AV conduction neuromodulation (located between the inferior vena cava and the right/left atrium) [1-3]. (termedia.pl)
  • The petrous carotid terminates in the lacerum segment shortly after turning superiorly out of the carotid canal. (neurosurgicalatlas.com)
  • CONCLUSIONS: Acute carotid sinus denervation, as a result of bilateral carotid body tumor resection, has a long-term effect on the level, variability, and rapid reflex control of arterial BP. (ru.nl)