Autonomic Nervous System
Autonomic Nervous System Diseases
Heart Septal Defects, Atrial
Pure Autonomic Failure
Ultrasonography, Doppler, Transcranial
Headache Disorders, Primary
Foramen Ovale, Patent
Maximal Voluntary Ventilation
Central Venous Pressure
Contrast transcranial Doppler ultrasound in the detection of right-to-left shunts. Reproducibility, comparison of 2 agents, and distribution of microemboli. (1/358)BACKGROUND AND PURPOSE: Cardiac right-to-left shunts can be identified by transcranial Doppler ultrasound (TCD) with the use of different contrast agents and by transesophageal echocardiography (TEE). Systematic data are available on neither the reproducibility of contrast TCD, the comparison of different contrast agents, nor the comparison of simultaneous bilateral to unilateral recordings. Furthermore, we assessed the side distribution of thus provoked artificial cardiac emboli. METHODS: Fifty-four patients were investigated by TEE and by bilateral TCD of the middle cerebral artery. The following protocol was performed twice: injection of 9 mL of agitated saline without Valsalva maneuver, injection of 9 mL of agitated saline with Valsalva maneuver, injection of 5 mL of a commercial galactose-based contrast agent without Valsalva maneuver, and injection of 5 mL of the galactose-based contrast agent with Valsalva maneuver. RESULTS: In 18 patients, a right-to-left shunt was demonstrated by TEE and contrast TCD (shunt positive). Twenty-nine patients were negative in both investigations, 1 was positive on TEE and negative on TCD, and 6 patients were only positive on TCD. Both bilateral and repeated recordings increased the sensitivity of contrast TCD. There was a symmetrical distribution of microembolic signals in the right and left middle cerebral artery. CONCLUSIONS: TCD performed twice and with the use of saline or a galactose-based contrast agent is a sensitive method in the identification of cardiac right-to-left shunts also identified by TEE. The cardiac microemboli in this study did not show any side preference for one of the middle cerebral arteries. (+info)
Physiological reflux and venous diameter change in the proximal lower limb veins during a standardised Valsalva manoeuvre. (2/358)OBJECTIVES: the aim of this study was to provide normal values for venous diameter at rest, and venous diameter and physiologic venous reflux during a standardised Valsalva manoeuvre. The impact of the patient's sex, body mass index (BMI), and family history was investigated. MATERIAL AND METHODS: eighty legs of 40 healthy volunteers were investigated in a supine position. The median age was 28 years (range 20-66 years). The common femoral vein (CFV), the proximal superficial femoral vein (SFV) and the proximal long saphenous vein (LSV) were investigated by duplex sonography. The following parameters were assessed: resting diameter (VDrest) and maximum diameter (VDmax) as well as reflux time (tr) during the Valsalva manoeuvre. The Valsalva manoeuvre was elicited by a forceful expiration into a tube system. The standard values used were a pressure of 30 mmHg, established within 0.5 seconds (s) and maintained over a time period of at least 3 s. RESULTS: mean VDrest and VDmax were 8.3+/-2.2 and 11.1+/-2.8 mm in the CFV, 5.9+/-1. 3 and 7.2+/-1.6 mm in the SFV and 3.5+/-0.9 and 4.3+/-1.4 mm in the LSV. Mean values for tr were 0.61+/-0.63 s in the CFV, 0.25+/-0.26 s in the SFV and 0.28+/-0.40 s in the LSV. A BMI >22.5 kg/m2 was associated with statistically significant larger values for VDrest and tr. If adjusted for BMI, tr in the SFV and the LSV did not differ by sex. For healthy subjects with first-degree relatives suffering from varicose veins (n=19), mean VDrest in the SFV as well as VD in the LSV was significantly larger (p=0.02, 0.05, respectively). Coefficients of variation for repeated measurements (VDrest, VDmax, tr) in the same segment varied between 3.3% and 16. 4% for the three investigated sites. CONCLUSIONS: normal values for VDrest and VDmax as well as reflux time during a standardised Valsalva manouevre were assessed in the proximal lower limb veins. The influences of BMI, sex and family history were investigated. The described standardised Valsalva manoeuvre led to highly reproducible results and can be recommended for further research projects or as a routine procedure for the assessment of venous reflux. (+info)
Methodological parameters influence the detection of right-to-left shunts by contrast transcranial Doppler ultrasonography. (3/358)BACKGROUND AND PURPOSE: Contrast transcranial Doppler ultrasonography is a new method to detect intracardiac right-to-left shunts, such as the patent foramen ovale. However, the methodology of the procedure varies considerably among investigators. This study was undertaken to assess the influence of methodological parameters on the results of the contrast transcranial Doppler examination in the detection of right-to-left shunts. METHODS: A total of 72 patients (mean age, 58.2+/-14.7 years) had a contrast transcranial Doppler ultrasonography examination. To study the influence of methodological factors, patients with evidence of a right-to-left shunt underwent repeated examinations with modified procedures. Parameters under investigation were the timing of the Valsalva maneuver, the dose of the contrast medium, and the patient's posture during the examination. RESULTS: The median contrast signal count was 58.5 and 48.0 (P<0.001) and the median latency of the first intracranially detected contrast signal was 12.5 and 8.5 seconds (P=0.05) when the Valsalva maneuver was performed 5 and 0 seconds after the start of the injection, respectively. Reducing the contrast medium dose from 10 to 5, 2.5, and 1.2 mL resulted in a decline of the median signal count from 54.5 to 28.5, 20.5, and 12.0 (P<0.01), respectively, while the latency of the first contrast signal increased from 13.3 to 14.0, 14.6, and 15.0 seconds (P<0.05). The sitting position also produced a lower signal count than the supine position (P<0.02). CONCLUSIONS: This study demonstrates that several essential methodological parameters influence the results of the contrast transcranial Doppler ultrasonography examination. Therefore, it is necessary to standardize the procedure to permit comparable quantitative assessments of the shunt volume. The findings of the present study suggest that 10 mL of contrast medium be injected with the patient in the supine position and that the Valsalva maneuver be performed 5 seconds after the start of the injection. (+info)
Ultrasonographic diagnosis and color flow Doppler sonography of internal jugular venous ectasia in children. (4/358)We investigated the diagnostic utility of ultrasonography in the diagnosis of internal jugular venous ectasia. Eight children (six boys, two girls) were recruited into this prospective study. Sonography of internal jugular venous ectasia in these patients revealed fusiform dilation of the internal jugular vein, and the possibility of thrombus and external compression could be ruled out. Marked variation in size of ectatic jugular veins during respiration was demonstrated under real-time sonography. The mean anteroposterior diameter of these dilated internal jugular veins was 0.79+/-0.18 mm (mean+/-standard deviation), which increased to 1.58+/-0.27 mm with Valsalva maneuver. Our study showed that the anteroposterior diameters of the internal jugular veins in cases of ectasia were greater than those of contralateral jugular veins in same patients as well as those in normal children, and they showed greater increase after Valsalva maneuver. Under color Doppler flow studies, turbulent vascular flows were demonstrated in these patients with jugular venous ectasia. No progression of venous ectasia was found in any of our patients during a 6 month follow-up period. We conclude that internal jugular venous ectasia in children is a benign condition, which usually does not require surgical intervention. Ultrasonography is a good diagnostic modality for the diagnosis of internal jugular venous ectasia. Color Doppler ultrasonography demonstrate the turbulent flow in jugular venous ectasia. (+info)
Acute manipulations of plasma volume alter arterial pressure responses during Valsalva maneuvers. (5/358)The effects of changes in blood volume on arterial pressure patterns during the Valsalva maneuver are incompletely understood. In the present study we measured beat-to-beat arterial pressure and heart rate responses to supine Valsalva maneuvers during normovolemia, hypovolemia induced with intravenous furosemide, and hypervolemia induced with ingestion of isotonic saline. Valsalva responses were analyzed according to the four phases as previously described (W. F. Hamilton, R. A. Woodbury, and H. T. Harper, Jr. JAMA 107: 853-856, 1936; W. F. Hamilton, R. A. Woodbury, and H. T. Harper, Jr. Am. J. Physiol. 141: 42-50, 1944). Phase I is the initial onset of straining, which elicits a rise in arterial pressure; phase II is the period of straining, during which venous return is impeded and pressure falls (early) and then partially recovers (late); phase III is the initial release of straining; and phase IV consists of a rapid "overshoot" of arterial pressure after the release. During hypervolemia, early phase II arterial pressure decreases were significantly less than those during hypovolemia, thus making the response more "square." Systolic pressure hypervolemic vs. hypovolemic falls were -7.4 +/- 2.1 vs. -30.7 +/- 7 mmHg (P = 0.005). Diastolic pressure hypervolemic vs. hypovolemic falls were -2.4 +/- 1.6 vs. -15.2 +/- 2.6 mmHg (P = 0.05). A significant direct correlation was found between plasma volume and phase II systolic pressure falls, and a significant inverse correlation was found between plasma volume and phase III-IV systolic pressure overshoots. Heart rate responses to systolic pressure falls during phase II were significantly less during hypovolemia than during hypervolemia (0.7 +/- 0.2 vs. 2.82 +/- 0.2 beats. min-1. mmHg-1; P = 0.05) but were not different during phase III-IV overshoots. We conclude that acute changes in intravascular volume from hypovolemia to hypervolemia affect cardiovascular responses, particularly arterial pressure changes, to the Valsalva maneuver and should be considered in both clinical and research applications of this maneuver. (+info)
Older subjects show no age-related decrease in cardiac baroreceptor sensitivity. (6/358)OBJECTIVE: To examine the relationship between age, blood pressure and cardiac baroreceptor sensitivity derived from spectral analysis, the Valsalva manoeuvre and impulse response function. METHODS: We studied 70 healthy normotensive volunteers who were free from disease and not taking medication with cardiovascular or autonomic effects. We measured beat-to-beat arterial blood pressure and used standard surface electrocardiography to record pulse interval under standardized conditions with subjects resting supine as well as during three Valsalva manoeuvres. We performed single, multiple and stepwise regression of patient characteristics against cardiac baroreceptor sensitivity results. RESULTS: There is a non-linear decline in cardiac baroreceptor sensitivity with advancing age, increasing systolic blood pressure and heart rate values (except for the Valsalva-derived result), but little further decline after the fourth decade. Only age significantly influenced values derived using the Valsalva manoeuvre and impulse response analysis. Using spectral analysis, age, systolic and diastolic blood pressure and heart rate influenced cardiac baroreceptor sensitivity, age contributing to 50% of the variability. Age also influenced the relationship between pulse interval and blood pressure, possibly indicating more non-baroreceptor-mediated changes with advancing age. CONCLUSIONS: Although age is the dominant factor influencing cardiac baroreceptor sensitivity in this normotensive population, there is little change in mean values after 40 years of age. The differences in the relationship between pulse interval and blood pressure with advancing age have implications for the calculation of cardiac baroreceptor sensitivity using spectral analysis. (+info)
Contrast transcranial Doppler ultrasound in the detection of right-to-left shunts: comparison of different procedures and different contrast agents. (7/358)BACKGROUND AND PURPOSE: Cardiac right-to-left shunts can be identified by transesophageal echocardiography (TEE) and by transcranial Doppler ultrasound (TCD) with the use of different contrast agents and different provocation procedures. Currently, data on an appropriate time window for the appearance of contrast bubbles in the TCD recording after the injection of the contrast medium and the comparison of different provocation maneuvers to increase right-to-left shunting are insufficient. METHODS: Forty-six patients were investigated by both TEE and bilateral TCD of the middle cerebral artery. The following protocol with 6 injection modes was applied in a randomized way: (1) injection of 10 mL of agitated saline without Valsalva maneuver, (2) injection of 10 mL of agitated saline with Valsalva maneuver, (3) injection of 10 mL of a commercial galactose-based contrast agent (Echovist) without Valsalva maneuver, (4) injection of 10 mL of Echovist with Valsalva maneuver, (5) injection of 10 mL of Echovist with standardized Valsalva maneuver, and (6) injection of 10 mL of Echovist with coughing. RESULTS: In 20 patients, a right-to-left shunt was demonstrated by TEE and contrast TCD (shunt-positive). Sixteen patients were negative in both investigations, no patient was positive on TEE and negative on TCD, and 10 patients were only positive on at least 1 TCD investigation but negative during TEE. The amount of microbubbles detected in the various tests decreased in the following order: Echovist and Valsalva maneuver, Echovist with coughing, Echovist and standardized Valsalva maneuver, saline with Valsalva maneuver, Echovist, and saline. With a time window of 20 to 25 seconds for the bubbles to appear in the TCD recording and with a sequence of first Echovist and Valsalva maneuver and then Echovist with coughing, all shunts were reliably identified with a specificity of 65% compared with TEE as the traditional gold standard. The time of first microbubble appearance was not helpful to distinguish between shunts detected on TEE and other shunts. CONCLUSIONS: TCD performed twice with 2 provocation maneuvers using Echovist is a sensitive method to identify cardiac right-to-left shunts also identified by TEE. (+info)
The effect of pregnancy on the lower-limb venous system of women with varicose veins. (8/358)OBJECTIVES: to assess the effect of pregnancy on the lower-limb venous system of women with varicose veins. Design a longitudinal prospective study of 11 pregnant women, with varicose vein disease. METHODS: eleven pregnant women with varicose veins were recruited as part of a larger study. Veins were assessed in both lower limbs using colour-flow duplex scanning at a 75 degrees head-up tilt. The diameter and velocity and duration of reflux were measured in each vein at 12, 20, 26, 34, 38 weeks gestation and 6 weeks postpartum. RESULTS: eleven women had reflux and varicose veins demonstrated at first scan. All veins dilated with increasing gestation. This was maximal in the superficial system, reaching significance (p+info)
Autonomic Nervous System Diseases (ANSDs) refer to a group of disorders that affect the autonomic nervous system (ANS), which is responsible for regulating involuntary bodily functions such as heart rate, blood pressure, digestion, and breathing. The ANS is divided into two branches: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). ANSDs can affect either or both branches of the ANS, leading to a range of symptoms and complications. Some common ANSDs include: 1. Multiple System Atrophy (MSA): a progressive disorder that affects the ANS, causing symptoms such as tremors, stiffness, and difficulty swallowing. 2. Parkinson's Disease: a neurodegenerative disorder that affects the ANS, leading to symptoms such as tremors, stiffness, and difficulty with balance and coordination. 3. Autonomic Failure: a group of disorders that affect the ANS, causing symptoms such as low blood pressure, dizziness, and fainting. 4. Postural Tachycardia Syndrome (POTS): a disorder that affects the ANS, causing symptoms such as rapid heart rate, dizziness, and fainting when standing up. 5. Orthostatic Hypotension: a disorder that affects the ANS, causing symptoms such as dizziness, fainting, and low blood pressure when standing up. Treatment for ANSDs depends on the specific disorder and its severity. In some cases, medications may be used to manage symptoms, while in other cases, lifestyle changes or surgery may be necessary.
Heart septal defects, atrial, also known as atrial septal defects (ASDs), are a type of heart defect that occurs when there is a hole in the wall (septum) that separates the two upper chambers of the heart, the atria. This hole allows blood to flow from one atrium to the other, which can cause a variety of symptoms and complications. ASDs can be present at birth (congenital) or can develop later in life (acquired). They are more common in females than males and are often associated with other heart defects. Symptoms of ASDs may include shortness of breath, fatigue, chest pain, and a heart murmur. In some cases, ASDs may not cause any symptoms and may be discovered incidentally during a routine physical examination or imaging test. Treatment for ASDs depends on the size and location of the defect, as well as the presence of any associated heart problems. Small ASDs may not require treatment and may close on their own over time. Larger ASDs may require surgery or other medical interventions to repair the defect and improve heart function.
Embolism, paradoxical refers to a type of blood clot that forms in a vein and travels through the bloodstream to the lungs, where it can cause a blockage in the pulmonary arteries. This type of embolism is called paradoxical because it occurs in the opposite direction of normal blood flow, which is from the veins to the heart and then to the lungs. Paradoxical embolism is typically caused by a hole or abnormal connection between the veins and the heart, such as a patent foramen ovale (PFO), which is a common congenital heart defect. Other risk factors for paradoxical embolism include deep vein thrombosis (DVT), which is a blood clot in a deep vein, and certain medical conditions such as cancer, pregnancy, and heart failure. Symptoms of paradoxical embolism may include shortness of breath, chest pain, coughing up blood, and rapid heartbeat. Treatment typically involves anticoagulant therapy to prevent further clots from forming and surgery to repair the abnormal connection between the veins and the heart if present.
Pure autonomic failure (PAF) is a rare disorder characterized by the gradual loss of function of the autonomic nervous system, which controls involuntary bodily functions such as heart rate, blood pressure, digestion, and sweating. In PAF, the autonomic nervous system fails to function properly, leading to symptoms such as dizziness, fainting, fatigue, and difficulty regulating body temperature. The disorder is typically diagnosed based on a combination of symptoms, physical examination, and tests that measure autonomic function. PAF is a progressive disorder, meaning that the symptoms typically worsen over time. There is currently no cure for PAF, but treatment can help manage symptoms and prevent complications. Treatment may include medications to regulate blood pressure and heart rate, physical therapy to improve balance and prevent falls, and lifestyle changes such as a healthy diet and regular exercise.
Hypotension, orthostatic refers to a drop in blood pressure that occurs when a person stands up from a seated or lying position. This type of hypotension is also known as postural hypotension or orthostatic hypotension. When a person stands up, the blood has to work against gravity to pump blood to the brain and other parts of the body. If the blood vessels in the legs and feet do not constrict properly, as they should when a person stands up, the blood may not be able to flow to the brain quickly enough, leading to a drop in blood pressure. Symptoms of orthostatic hypotension may include dizziness, lightheadedness, fainting, and blurred vision. It is more common in older adults, particularly those who are taking certain medications, such as alpha blockers or diuretics, or who have certain medical conditions, such as Parkinson's disease or diabetes. Treatment for orthostatic hypotension may include lifestyle changes, such as drinking plenty of fluids and avoiding standing up too quickly, as well as medications to help constrict blood vessels and increase blood pressure. In severe cases, medical intervention may be necessary to prevent serious complications.
Primary headache disorders are a group of conditions characterized by recurrent headaches that are not caused by an underlying medical condition or neurological disorder. These disorders are classified into three main categories: migraine, tension-type headache, and cluster headache. Migraine is a severe, recurring headache that is often accompanied by other symptoms such as nausea, vomiting, sensitivity to light and sound, and visual disturbances. Tension-type headache is a common type of headache that is characterized by a dull, aching pain that is usually located on both sides of the head. Cluster headache is a rare but severe type of headache that is characterized by intense, one-sided pain around the eye, often accompanied by tearing, nasal congestion, and redness of the eye. Primary headache disorders are typically treated with medications such as analgesics, anti-inflammatory drugs, and triptans, as well as lifestyle changes such as stress management, regular exercise, and maintaining a healthy diet. In some cases, alternative therapies such as acupuncture, biofeedback, and relaxation techniques may also be helpful in managing symptoms.
Foramen ovale, patent refers to a condition in which the foramen ovale, a small opening in the heart's septum that normally closes shortly after birth, remains open in an adult. This can be a normal variation in some individuals, but in other cases, it may be associated with certain medical conditions such as atrial septal defect (ASD), pulmonary hypertension, or venous thromboembolism. A patent foramen ovale can sometimes cause blood to flow from the right side of the heart to the left side, which can lead to symptoms such as shortness of breath, fatigue, and dizziness. Treatment options for a patent foramen ovale may include medication, catheter-based procedures, or surgery, depending on the severity of the condition and the presence of any associated symptoms.
Pneumocephalus is a medical condition in which air or gas enters the cranial cavity, causing the brain to be surrounded by air. This can occur due to a variety of causes, including head trauma, surgery, or spontaneous rupture of a blood vessel in the brain. Symptoms of pneumocephalus may include headache, nausea, vomiting, double vision, and hearing loss. Treatment typically involves the removal of the air or gas from the cranial cavity, either through a surgical procedure or by using a procedure called a decompressive craniectomy.
Butylscopolammonium Bromide is a quaternary ammonium compound that is commonly used as an antiseptic and disinfectant in the medical field. It is a white, crystalline powder that is soluble in water and has a bitter taste. Butylscopolammonium Bromide is effective against a wide range of microorganisms, including bacteria, viruses, and fungi. It is often used in hospitals and clinics to disinfect surfaces, equipment, and medical instruments. It is also used in personal care products such as hand sanitizers, soaps, and shampoos. However, Butylscopolammonium Bromide can be toxic if ingested or inhaled in large quantities. It can cause skin irritation, eye irritation, and respiratory problems. Therefore, it is important to use it according to the instructions and to avoid contact with the skin and eyes.
Uterine prolapse is a medical condition in which the uterus, the muscular organ that contains and nourishes a developing fetus, drops down into the vagina or even outside of the body. This can occur due to weakened or damaged muscles and ligaments that support the uterus, which can be caused by childbirth, aging, menopause, or chronic coughing or constipation. Symptoms of uterine prolapse may include a feeling of heaviness in the pelvis, a bulge or lump in the vagina, difficulty emptying the bladder or bowels, and pain during intercourse or when coughing or sneezing. In severe cases, the uterus may protrude so much that it is visible outside of the body. Treatment for uterine prolapse may include lifestyle changes, such as weight loss or quitting smoking, as well as physical therapy to strengthen the muscles and ligaments that support the uterus. In more severe cases, surgery may be necessary to repair or remove the damaged tissues and restore the uterus to its proper position.
Hypovolemia is a medical condition characterized by a decrease in the volume of blood circulating in the body. This can occur due to various reasons, including blood loss, dehydration, or certain medical conditions that affect the body's ability to retain fluids. Symptoms of hypovolemia may include dizziness, lightheadedness, weakness, rapid heartbeat, low blood pressure, and cold, clammy skin. In severe cases, hypovolemia can lead to shock, which is a life-threatening condition that requires immediate medical attention. Treatment for hypovolemia depends on the underlying cause. In cases of blood loss, such as from trauma or surgery, blood transfusions may be necessary to restore blood volume. In cases of dehydration, fluids and electrolytes may be administered intravenously to replace lost fluids and minerals. In some cases, medications may be prescribed to help the body retain fluids or increase blood volume.
An aortic aneurysm is a bulge or dilation in the wall of the aorta, which is the largest artery in the body. It occurs when the wall of the aorta becomes weakened and begins to balloon outwards. Aneurysms can occur in any part of the aorta, but the most common location is in the abdominal aorta, just below the kidneys. Aneurysms can be caused by a variety of factors, including high blood pressure, atherosclerosis (hardening of the arteries), smoking, and genetic conditions such as Marfan syndrome or Ehlers-Danlos syndrome. They can also be caused by injury or infection. Aortic aneurysms can be asymptomatic, meaning that they do not cause any noticeable symptoms. However, if the aneurysm becomes large enough, it can cause pain in the abdomen or back, and in severe cases, it can rupture, leading to life-threatening internal bleeding. Treatment for aortic aneurysms depends on the size and location of the aneurysm, as well as the patient's overall health. Small aneurysms may be monitored with regular imaging tests, while larger aneurysms may require surgery to repair or replace the affected section of the aorta. In some cases, endovascular repair, a minimally invasive procedure, may be used to treat aneurysms.
Varicocele is a medical condition in which the veins in the scrotum become enlarged and twisted, usually due to a blockage or weakness in the valves that control blood flow. This can lead to a buildup of blood in the veins, causing them to become engorged and twisted. Varicocele is most commonly seen in men, and it is often associated with infertility. It is typically diagnosed through a physical examination and imaging tests such as ultrasound. Treatment options for varicocele may include medication, surgery, or other procedures to improve blood flow and reduce swelling.
Toilet-related injuries and deaths
List of eponyms (L-Z)
Middle ear barotrauma
Visual impairment due to intracranial pressure
Quantium Medical Cardiac Output
Death during consensual sex
Inferior vena cava
Paroxysmal supraventricular tachycardia
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- You have a history of PSVT and an episode does not go away with the Valsalva maneuver or by coughing. (medlineplus.gov)
- and locking it in with a valsalva maneuver is typically part of this process. (lifehacker.com)
- One of the methods, the Valsalva Maneuver, involves plugging the nose while applying slight blowing pressure while holding one's breath. (macksearplugs.com)
- To see how well it works, the team randomized 10 women and 38 men about equally to four removal techniques: the standard expire Valsalva, the standard inspire Valsalva, and two balloon maneuvers - blowing the balloon up after a deep breath and blowing it up with residual lung volume after an initial exhalation. (mdedge.com)
- MATERIALS AND METHODS: A cardiac-gated fast cine-PC sequence with ≤15-second acquisition time was used to assess CSF flow in 8 healthy participants at the foramen magnum at rest, during, and immediately after a controlled Valsalva maneuver. (elsevierpure.com)
- RESULTS: Both methods showed 1) a decrease from baseline in V̄ CSF and A pp during Valsalva and 2) an increase in V̄ CSF and A immediately after Valsalva compared with values measured both at rest and during Valsalva. (elsevierpure.com)
- Whereas fast cine-PC produced a single CSF flow waveform that is an average over many cardiac cycles, pencil-beam imaging depicted waveforms for each heartbeat and was able to capture many dynamic features of CSF flow, including transients synchronized with the Valsalva maneuver. (elsevierpure.com)
- CONCLUSIONS: Both fast cine-PC and pencil-beam imaging demonstrated expected changes in CSF flow with Valsalva maneuver in healthy participants. (elsevierpure.com)
- Incontinence may occur or worsen with maneuvers that increase intra-abdominal pressure. (msdmanuals.com)
- Valsalva-CT shows very high specificity and high accuracy for the diagnosis of inguinal hernia . (bvsalud.org)
- The balloon method is being used there now in nontrauma patients, as well, but the standard maneuvers are also being used until the balloon technique shows statistically significant benefits, he said. (mdedge.com)
- The Valsalva maneuver (VL) is a well-documented assessment of autonomic function, and is characterized by 5 distinct blood pressure phases (Phases I, IIa, IIb, III, and IV). (wku.edu)
- The real-time capability of pencil-beam imaging may be necessary to detect Valsalva-related transient CSF flow obstruction in patients with pathologic conditions such as Chiari I malformation. (elsevierpure.com)
- Les patients ont été répartis aléatoirement en deux groupes, le premier bénéficiant d'une intervention basée sur le yoga contrairement au second. (who.int)
- Un effet positif important a donc été observé lorsqu'une thérapie yogique a été appliquée en tant que traitement adjuvant chez des patients atteints d'une maladie coronarienne. (who.int)
- To apply the concept to individual patients, computed tomography of the abdomen at rest and during the Valsalva maneuver was used. (researchgate.net)
- Instead of standard inhale or exhale Valsalva maneuvers, they have their patients blow up a party balloon as the tube is pulled. (mdedge.com)
- First, it's easy to explain and for patients to understand and do - not much more instruction is required than "blow up the balloon" - and, secondly, the inflating balloon is a visual check to make sure patients are doing the maneuver correctly. (mdedge.com)
- Incontinence may occur or worsen with maneuvers that increase intra-abdominal pressure. (msdmanuals.com)
- Valsalva's maneuver. (hekint.org)
- Factors that can lead to the development of SPM include alterations in breathing patterns such as bronchial asthma, marijuana smoking, cocaine inhalation, and barotrauma occurring with Valsalva's maneuver. (who.int)
- Valsalva's maneuver in vasodepressive syncope]. (bvsalud.org)
- When clinically advisable, appropriate vagal maneuvers (e.g. (nih.gov)
- Performance of the Valsalva maneuver in patients with pulmonary hypertension should be routinely performed to identify changes in symptoms, as well as the need to adjust therapy. (medscape.com)
- 16. Factitious pheochromocytoma: novel mimickry by Valsalva maneuver and clues to diagnosis. (nih.gov)
- Hallpike (Nylen-Bárány) maneuver consists of having the patient lie back in bed from a sitting position 3 times in succession. (medscape.com)
- Source It is a paradox that the discovery of the Valsalva maneuver did not relate to cardiovascular physiology but to the treatment of discharges from the ear. (hekint.org)
- This article reported a rare case of a ruptured RAM due to the Valsalva maneuver in an elderly female with constipation and offered a review of the relevant literature. (nih.gov)
- Participants performed various exercises to intentionally raise their blood pressure, such as completing hand grip exercises, peddling on a stationary bike, or performing the Valsalva maneuver (when one attempts to forcefully exhale when their mouth is closed and their nose is pinched shut). (nih.gov)