• Our group has developed nonimaging and dedicated Doppler techniques for measuring blood velocity in the large and small peripheral arteries of anesthetized mice. (nih.gov)
  • The magnitudes and waveforms of blood velocities from both cardiac and peripheral sites are similar in mice and humans, such that much of what is learned using Doppler technology in mice may be translated back to humans. (nih.gov)
  • Transcranial Doppler (TCD) is a noninvasive, less expensive and harmless hemodynamic study of main intracranial arteries. (biomedcentral.com)
  • Transcranial Doppler (TCD) is a noninvasive, less expensive, safe, and harmless technique being commonly used studying main intracranial arteries especially in cerebrovascular occlusive disease. (biomedcentral.com)
  • Asymptomatic and hemodynamic extracranial internal carotid stenosis were excluded by continue wave Doppler study and suprathrochlear artery response to facial and superficial temporal arteries compression. (biomedcentral.com)
  • To assess the reproducibility of, and determine normative data for, flow volume measurements from the right common carotid artery (CCA) and its relation to left ventricular output (LVO) in stable term and preterm babies using Doppler ultrasound. (bmj.com)
  • Doppler ultrasound has traditionally been used to measure blood flow velocity in the cerebral artery in the newborn. (bmj.com)
  • 3 Technological advances in ultrasound now allow more accurate assessment of vessel diameter 4 and computation of volumetric flow using Doppler ultrasound. (bmj.com)
  • 5, 6 In the newborn, superior vena cava (SVC) flow has been assessed by Doppler ultrasound. (bmj.com)
  • 7 We have assessed the validity of volumetric measurements using a near focus transducer on a Doppler ultrasound phantom and determined the intraobserver and interobserver reproducibility of right common carotid artery (CCA) flow in newborn infants. (bmj.com)
  • We also aimed to assess if there was a relation between right CCA flow, left ventricular output (LVO), and traditionally assessed Doppler measurements of anterior cerebral artery blood flow velocity (ACABFV). (bmj.com)
  • DESIGN Quantitative coronary angiography and Doppler flow velocity measurements were used to determine the effects of the nitric oxide synthase inhibitor N G -monomethyl- L -arginine (L-NMMA) on magnesium induced dilation of the epicardial and resistance coronary arteries. (bmj.com)
  • Transcranial Doppler sonography is used for evaluation of cerebral blood flow changes. (hindawi.com)
  • This dataset contains 37 diabetic participants and 49 controls (aged 55 to 75 years) with continuous measurements of cerebral blood flow using transcranial Doppler and MRI, heart rate, blood pressure, and respiratory parameters, balance, walking, laboratory and retinopathy measures. (physionet.org)
  • Medical history, MRI questionnaire and pre-tests (vital signs, anthropometric measurements, transcranial Doppler (TCD) window, autonomic test and blood draw) were performed. (physionet.org)
  • Patients underwent bilateral insonation of middle cerebral arteries with standard 2-Hz probes over the temporal windows with transcranial Doppler. (karger.com)
  • using tissue Doppler velocities. (frontiersin.org)
  • Normal spectral Doppler waveform of umbilical artery and vein in a near-term fetus. (medscape.com)
  • Spectral Doppler waveform of umbilical artery in intrauterine growth retardation (IUGR) demonstrates loss of diastolic flow. (medscape.com)
  • For those found to have growth restriction, the ACR notes that duplex Doppler velocimetry of the umbilical artery and a biophysical profile are usually appropropriate. (medscape.com)
  • [ 14 ] Doppler velocimetry measures hemodynamic flow of major fetal vessels, allowing comparison of the flow indices and patterns of normal and IUGR cases. (medscape.com)
  • The most frequently studied vessel in Doppler velocimetry is the umbilical artery because of its accessibility and association with fetal outcome. (medscape.com)
  • If the estimated fetal weight is below the 10th percentile for gestational age, they suggest that further evaluation be considered, such as amniotic fluid assessment and Doppler blood flow studies of the umbilical artery. (medscape.com)
  • Melchiorre et al found that there is a significant relationship between first-trimester uterine artery Doppler resistance indices (RI) and the subsequent delivery of neonates who are small for gestational age (SGA) or have intrauterine growth restriction. (medscape.com)
  • They found, however, that the sensitivity of first-trimester uterine artery Doppler is greater for SGA with preeclampsia than it is for IUGR alone and noted that this difference could be the result of different underlying placental abnormalities that are detected variably on first-trimester uterine artery Doppler evaluation. (medscape.com)
  • [ 2 ] Features of FMD that can be identified with Doppler ultrasound include beading, turbulent blood flow and abnormally high speed (velocity) blood flow, and tortuosity or S-shaped arteries. (medscape.com)
  • In 25 of these subjects, stimulated coronary blood flow was calculated from flow velocity, measured using intracoronary Doppler and coronary luminal diameter before and after intracoronary adenosine, ACh (acetylcholine) and ISDN (isosorbide dinitrate) infusions. (portlandpress.com)
  • Doppler study showed a high resistance to flow in both common carotid arteries and low bilateral MCA flow with low systolic and diastolic velocities. (hindawi.com)
  • Transcranial doppler sonography: a new noninvasive method for measuring toxicant-induced alterations in cerebral blood flow. (cdc.gov)
  • The use of transcranial doppler (TCD) sonography as a screening procedure to detect changes in cerebral blood flow after exposure to a toxicant was evaluated using an animal model. (cdc.gov)
  • Preliminary report of 48-hours Atosiban administration in spontaneous preterm labor - Doppler blood flow assessment of placental and fetal circulation. (nel.edu)
  • Conventional Doppler techniques assess the velocity of blood flow by measuring high-frequency, low-amplitude signals from small, fast-moving blood cells. (loinc.org)
  • Blood pressure inside the heart and lungs may also measured using Doppler echocardiography or right-sided cardiac catheterization. (antiessays.com)
  • Colour Doppler imaging was used to assess the peak systolic and end-diastolic blood velocities as well as resistivity index in the ophthalmic, central retinal and posterior ciliary arteries. (bmj.com)
  • Co-registered 3D rendered ultrasound (greyscale) and color Doppler (red and blue) coronal image of a mouse brain during ligation of the right common carotid artery. (visualsonics.com)
  • Doppler ultrasonography shows the direction and velocity of blood flow and thus can detect turbulent flow due to narrowing or blockage of blood vessels. (msdmanuals.com)
  • Color Doppler ultrasonography shows the different directions of blood flow in different colors. (msdmanuals.com)
  • Doppler ultrasonography and color Doppler ultrasonography are commonly used to help diagnose disorders affecting the heart and the arteries and veins in the trunk, legs, and arms. (msdmanuals.com)
  • Spectral Doppler ultrasonographic waveform of the right hepatic artery in a 60-year-old man, 8 years after orthotopic liver transplantation. (medscape.com)
  • 1. Introduction repetition frequency, fprf, which yields a sinusoidal signal with a frequency of In medical ultrasound systems, spectral Doppler is a 2vz powerful tool for non-invasive estimation of velocities in fp f c c , 1 blood vessels (see, e.g., [1] and the references therein). (lu.se)
  • Change from baseline in luminal arterial diameter was most substantial when measured at 30 seconds following release of occlusion, whereas blood flow velocity changes were maximal when measured at 15 seconds following release. (avma.org)
  • The FMD responses in dogs were most substantial when performed at the brachial artery with blood flow velocity and luminal arterial diameter changes from baseline measured at 15 and 30 seconds, respectively, following release of a 3-minute occlusion period. (avma.org)
  • Flow mediated dilation after 5-minute cuff occlusion and post-deflation shear rate were assessed. (actapress.com)
  • Fibromuscular dysplasia (FMD) is a noninflammatory, nonatherosclerotic arterial disease of the medium-sized arteries throughout the body, which could lead to arterial stenosis, occlusion, aneurysm, and dissection. (medscape.com)
  • We report two cases where an anti-gravity suit (also named MAST: Medical Antishock Trousers [ 1 , 2 ]) was applied with a low gradient of pressure during the acute phase of symptomatic carotid occlusion to amplify the blood volume shift towards the craniothoracic territory [ 3 , 4 ], improving cerebral haemodynamic conditions and neurological symptoms. (hindawi.com)
  • The MR Angiography (MRA) showed a proximal left internal carotid artery (ICA) occlusion, a tight stenosis on the distal right ICA, no signal in the right siphon and right MCA, while there was a weak signal in the left MCA (Figure 4 ). (hindawi.com)
  • Approximately 40-50% of patients with GCA have ophthalmologic complications, including visual loss secondary to A-AION, central retinal artery occlusion, homonymous hemianopsia or cortical blindness (uni- or bilateral occipital infarction) [ 6 ]. (intechopen.com)
  • Peripheral arterial disease, specifically lower limb peripheral arterial disease, can be defined as atheromatous narrowing or occlusion of an artery or arteries in the lower limb. (intechopen.com)
  • The principle of endovascular embolization is occlusion of the pathological blood vessels of the underlying vascular malformation using a microcatheter, which is selectively positioned within or proximal to the pathology, by injection of an occlusive substance into these vessels. (springer.com)
  • Magnetic resonance angiogram of the recipient celiac axis depicts complete occlusion of the hepatic artery. (medscape.com)
  • Renal artery stenosis (RAS) is a major cause of RVHT and accounts for 1-10% of the 50 million cases of hypertension in the United States. (medscape.com)
  • Stenosis, or stiffening, of the carotid arteries occurs when fatty deposits, or plaques, adhere to the walls of the arteries that supply blood to the brain. (southnassau.org)
  • Low cerebral blood flow can affect cognition in patients with high-grade asymptomatic internal carotid artery stenosis. (karger.com)
  • Such information would be critical in treatment decisions about whether to intervene in patients with high-grade carotid artery stenosis who are at risk for cognitive decline. (karger.com)
  • Patients with ≥80% unilateral internal carotid artery stenosis with no history of stroke were recruited from inpatient and outpatient practices at a single, large, comprehensive stroke center. (karger.com)
  • Forty-two patients with unilateral high-grade internal carotid artery stenosis without stroke were enrolled (26 males, age = 74 ± 9 years, education = 16 ± 3 years). (karger.com)
  • In high-grade, asymptomatic carotid artery stenosis, cognitive impairment correlated linearly with lower flow in the hemisphere fed by the occluded internal carotid artery, but only below a threshold of MFV = 45 cm/s. (karger.com)
  • Patients with an anterior communicating artery (AcoA) and a posterior communicating artery (PcoA) that supply the hemisphere distal to a severe ICA stenosis have a risk of transient ischemic attack (TIA) and stroke that is lower than that of patients without such collaterals ( 1 ). (ajnr.org)
  • CT angiography (CTA) imaging with maximum intensity projection (MIP) and quantitative measurement of stenosis is an accurate noninvasive technique for diagnosing fibromuscular dysplasia/stenosis of the visceral arteries, regardless of the etiology. (medscape.com)
  • The clinical manifestations reflect the arteries involved and most commonly include hypertension caused by renal-artery stenosis (RAS) or strokes from carotid artery disease. (medscape.com)
  • Furthermore, it is generally also necessary to of stenosis in the blood vessels [11] . (lu.se)
  • Brachial artery diameters and blood velocities were obtained by means of high-resolution ultrasound machine. (actapress.com)
  • GLP-1 and insulin increased brachial artery diameter and blood flow, but this effect was not additive. (medscape.com)
  • Peak systolic, end diastolic and mean velocities of nine main intracranial arteries were determined using TCD. (biomedcentral.com)
  • The average of the maximum velocity (MV), peak systolic velocity (PV), end diastolic velocity (EDV) and pulsatility index (PI) were automatically calculated and recorded. (biomedcentral.com)
  • The following parameters were recorded at baseline, after intravenous infusion of 500 mL of fluid load (colloid), 15 minutes and 150 minutes during LBPP application and 10 minutes after gravity suit deflation: right arm mobility, blood pressure, heart rate, systolic and diastolic velocities recorded on both MCAs and resistance index (RI) recorded on both common carotids arteries (CCAs). (hindawi.com)
  • During LBPP application and up to 48 hours later, there was a 50% increase in systolic and diastolic MCA velocities (Figure 1 ). (hindawi.com)
  • Note the left side improvement in systolic and diastolic blood flow velocity induced by LBPP, which was sustained for at least 2 days. (hindawi.com)
  • 2. False Systolic pressure is the lowest pressure against the walls of the blood vessels. (antiessays.com)
  • We measured Critical Flicker Fusion Frequency (CFFF), blood oxygen saturation, Psychology Experiment Building (PEBL) including three tests (Modified Math Processing Task, Perceptual Vigilance Task, and Time Estimation Task), as well as Cerebral Blood Flow index (CBFi), mean cerebral artery Systolic and diastolic velocities, Cerebral Pulsatility index (CPi), and heart Rate. (daneurope.org)
  • Typical values of PWV in the aorta range from approximately 5 m/s to >15 m/s.[citation needed] Measurement of aortic PWV provides some of the strongest evidence concerning the prognostic significance of large artery stiffening. (wikipedia.org)
  • The aorta is the largest artery in the body. (southnassau.org)
  • This is almost invariably due to giant cell arteritis (GCA), which is a primary vasculitis that affects extracranial medium (especially external carotid artery-ECA-branches) and sometimes large arteries (aorta and its major branches)-large-vessel GCA [ 3 , 4 ]. (intechopen.com)
  • Aorta+Iliac artery.bilateral' to conform with the LOINC/RadLex unified model. (loinc.org)
  • The ductus arteriosus is a small fetal structure that connects two large arteries (aorta and pulmonary) but becomes pathological when it is maintained after birth. (bvsalud.org)
  • Ductus arteriosus is a small arteriosus structure which communicates two big arteries with different resistances (aorta and pulmonar), normally present in the infant in which becomes pathological when kept after birth 1 . (bvsalud.org)
  • Inflammation plays a major role in arteriosclerosis development, and consequently it is a major contributor in large arteries stiffening. (wikipedia.org)
  • MAIN OUTCOME MEASURES Diameter of the proximal and distal segments of the epicardial coronary arteries and coronary blood flow. (bmj.com)
  • Transoral carotid ultrasonography gives us additional information to conventional carotid ultrasonography about the vascular pathology of the distal portion of the extracranial internal carotid artery and a transpulmonary contrast medium, which has made it easy to assess intracranial vascular structures, is now available. (go.jp)
  • This 52-year-old man presented with pain in the left upper quadrant and was found to have a 3.2-cm aneurysm of the distal splenic artery. (medscape.com)
  • Carotid-femoral pulse wave velocity (PWV) was evaluated by Applanation tonometry (SphygmoCor) and the aortic pressure waveform was used to calculate the Augmentation index (Aix). (nih.gov)
  • Aims: Carotid-femoral pulse wave velocity (PWV), a direct measure of aortic stiffness, has become increasingly important for total cardiovascular (CV) risk estimation. (kcl.ac.uk)
  • To compare the carotid stiffness and flow parameters by ultrafast ultrasound imaging (UF), in bicuspid aortic valve (BAV) patients to first-degree relatives (controls). (frontiersin.org)
  • The involvement of common carotid arteries in the aortic remodeling process in case of BAV remains controversial. (frontiersin.org)
  • When undertaking diagnostic and treatment procedures for stroke patients, it is essential to evaluate vascular lesions at the extracranial and intracranial cerebral arteries and aortic arch and to look for underlying heart diseases. (go.jp)
  • In conclusion, we recommend all stroke neurologists (strokologists) to become familiar with neurosonology for exploring the heart, aortic arch, extracranial and intracranial arteries and peripheral leg veins. (go.jp)
  • Stent placement to prevent coil protruding into the parent artery has been successfully applied to intracranial aneurysm treatment. (ajnr.org)
  • a) Patterns of intracranial MCA blood flow velocities with time in both the right and left sides, before, during, and after (10 minutes and 48 hours) LBPP application. (hindawi.com)
  • Identification of the intracranial collaterals assists in identifying patients with severe occlusive disease of the internal carotid arteries who are at lower risk of transient ischemic attacks (TIAs) and stroke. (ajnr.org)
  • The prognostic value of functioning intracranial collaterals in patients with occlusive disease of the carotid artery is the subject of ongoing studies ( 2 ). (ajnr.org)
  • Knowledge of the collateral ability of the circle of Willis is important for neurosurgeons, vascular surgeons, and interventional radiologists when a procedure in the intracranial or extracranial cerebral arteries is to be attempted. (ajnr.org)
  • However, it is not clear whether opacification of intracranial collaterals on conventional angiograms or MR angiograms proves that they can act as functional collaterals when carotid arteries become stenotic or occluded. (ajnr.org)
  • More recently it has been used to measure CBF by evaluating extracranial cerebral arteries in adults and children. (bmj.com)
  • With these methods one can measure cardiac filling and ejection velocities, velocity pulse arrival times for determining pulse wave velocity, peripheral blood velocity and vessel wall motion waveforms, jet velocities for the calculation of the pressure drop across stenoses, and left main coronary velocity for the estimation of coronary flow reserve. (nih.gov)
  • In term and preterm infants, right CCA flow was about 20 ml/kg/min, accounting for 11% of cardiac output. (bmj.com)
  • In stable, spontaneously breathing babies, both cardiac output and carotid flow increased with gestation and body weight. (bmj.com)
  • Although CBF, SVC flow, and cardiac output has been measured in newborn babies, it is not known what proportion of cardiac output is cephalic flow. (bmj.com)
  • 7. A procedure in which a catheter is passed into a vein or artery and is guided into the heart: cardiac catheterization. (antiessays.com)
  • Objective To examine whether GLP-1 and insulin act additively on skeletal and cardiac microvasculature and conduit artery. (medscape.com)
  • Signal Processing 91 (2011) 1275-1283 reduces the temporal resolution and makes it difficult to simultaneously, for instance, allowing the medical doctor see details in the rapid acceleration phases of the cardiac to compare the blood velocities before and after a region cycle [2] . (lu.se)
  • Arterial dysplasias (AD) are an uncommon angiopathy associated with heterogeneous histologic changes that may affect the carotid circulation and the visceral and peripheral arteries. (medscape.com)
  • Peripheral Artery Disease, commonly referred to as PAD, is a chronic condition. (southnassau.org)
  • Fibromuscular dysplasia is an uncommon angiopathy of uncertain etiology associated with heterogeneous histologic changes that may affect the carotid and vertebral circulation, visceral arteries, and peripheral arteries. (medscape.com)
  • The speed of travel of this pulse wave (pulse wave velocity (PWV)) is related to the stiffness of the arteries. (wikipedia.org)
  • The relationship between arterial stiffness and pulse wave velocity was first predicted by Thomas Young in his Croonian Lecture of 1808 but is generally described by the Moens-Korteweg equation or the Bramwell-Hill equation. (wikipedia.org)
  • Devices are on the market that measure arterial stiffness parameters (augmentation index, pulse wave velocity). (wikipedia.org)
  • The increase in pulse pressure may result in increased damage to blood vessels in target organs such as the brain or kidneys. (wikipedia.org)
  • A high frame rate (2,000 frames/s) was used to measure the pulse wave velocity (PWV). (frontiersin.org)
  • This new imaging modality gives access to local parameters of arterial stiffness, such as the pulse wave velocity (PWV) and the arterial wall distensibility. (frontiersin.org)
  • His resting pulse rate was 92 / min, blood pressure was 128/74 mmHg and respiratory rate was 24 / min. (ispub.com)
  • The diagnosis of GCA requires age more than 50 years at disease onset, new headache in the temporal area, temporal artery tenderness, and/or reduced pulse, jaw claudication, systemic symptoms, erythrocyte sedimentation rate (ESR) exceeding 50 mm/hr, and typical histologic findings (granulomatous involvement) in temporal artery biopsy (TAB) [ 5 ]. (intechopen.com)
  • and pulse wave velocity (PWV) were measured. (medscape.com)
  • Taking out a single sample from each pulse the PSD as a function of time, a so-called sono- or emission produces a signal sampled at the pulse spectrogram, visualizes changes in the blood velocity distribution over time. (lu.se)
  • Thus the main function of vascular smooth muscle tone is to regulate the caliber of the blood vessels in the body. (onteenstoday.com)
  • We and others have identified functional MR in human vascular smooth muscle cells (SMCs), suggesting that vascular MR might directly regulate blood pressure. (onteenstoday.com)
  • The vascular endothelium modulates contractile responses to 5-HT and ET-1 in human subcutaneous resistance arteries but this effect is lost in patients with NPG, indicating a selective defect in agonist mediated release of endothelium derived vasodilators. (bmj.com)
  • 9 Impaired systemic vascular function has been demonstrated in patients with NPG in whom blood flow in the fingers is reduced 10, 11 (both under basal conditions and following cold provocation) and endothelium dependent vasodilatation in the forearm is impaired. (bmj.com)
  • 12 The relatively small number of studies to have assessed vascular reactivity and blood flow in the systemic circulation of these patients, however, prevents identification of the mechanisms underlying these abnormalities. (bmj.com)
  • The mechanisms of vascular dysfunction have been investigated in a number of conditions, including hypertension 13 and diabetes, 14 using subcutaneous arteries isolated from biopsies of gluteal fat. (bmj.com)
  • This approach has the advantage of studying vascular dysfunction directly in arteries from patients (rather than animal models) and uses resistance arteries which contribute significantly to maintenance of blood pressure. (bmj.com)
  • The complex brain interstitial system is the communication and exchange network between the vascular system (blood circulation system) and nerve messaging networks. (caringmedical.com)
  • The diagnostic and prognostic information available from captopril renography and the increasing availability of magnetic resonance angiography (MRA) have reduced the use of renal arteriography as a diagnostic tool, except in evaluating kidneys with intrarenal branch-artery stenoses and those with complex vascular anatomy, including multiple accessory arteries. (medscape.com)
  • In arteries, the tunica media, which contains smooth muscle cells and elastic tissue, is thicker than that of veins so it can modulate vessel caliber and thus control and maintain blood pressure. (onteenstoday.com)
  • Methods: Contractile and relaxant function was assessed in arteries dissected from gluteal fat biopsies (11 NPG, 12 control) using small vessel myography. (bmj.com)
  • The contrast-to-background ratio and vector correlation were lower downstream in the imaged blood vessel, independent of the location of the stent. (utwente.nl)
  • Blood velocity estimation vessel regions while retaining an adequate updating rate of the B-mode images. (lu.se)
  • The Windkessel effect buffers the pulsatile ejection of blood from the heart converting it into a more steady, even outflow. (wikipedia.org)
  • All patients had angiographically normal epicardial coronary arteries, normal left ventricular function (contrast ventriculographic ejection fraction ⩾ 50%) and a normal coronary flow reserve. (bmj.com)
  • 4-7 In the setting of coronary artery disease, several studies have shown the efficacy of magnesium infusion in patients with acute myocardial infarction, 4 vasospastic angina, 5 and unstable angina. (bmj.com)
  • Active supplement had no effect on basal coronary artery tone or stimulated coronary vasoreactivity or blood flow compared with placebo. (portlandpress.com)
  • Cardiovascular disease is known as the leading cause of death, including coronary artery disease and stroke. (wku.edu)
  • Krasnicki et al evaluated the relationship between ocular blood flow parameters and diabetic retinopathy and coronary artery disease in diabetic patients. (bmj.com)
  • Stress Testing Stressing the heart (by exercise or by use of stimulant drugs to make the heart beat faster and more forcibly) can help identify coronary artery disease. (msdmanuals.com)
  • In coronary artery disease, blood flow. (msdmanuals.com)
  • Giovanni Borelli (1608-1679), which is seen by many as the father of bioengineering, studied the contraction of the heart and its interaction with the arteries, where he understood the capacitive effect of the elastic arteries on smoothing the flow of blood (now known as the Windkessel effect to be later discussed). (scirp.org)
  • This study aimed to determine whether the function of systemic resistance arteries was altered in patients with NPG. (bmj.com)
  • [ 14 ] Recent evidence confirms that GLP-1 exerts a potent vasodilatory effect on the conduit and resistance arteries as well as terminal arterioles to significantly increase total muscle blood flow and muscle microvascular perfusion in rats and in healthy humans. (medscape.com)
  • [ 2 ] Disease manifestations depend on the arterial bed involved: most often, the extracranial carotid or vertebral arteries are associated with headache (generally migraine-type), pulsatile tinnitus , neck pain, or dizziness, whereas the renal arteries are often associated with hypertension. (medscape.com)
  • MRA provides accurate information about the number of renal arteries, the size of the kidneys, and the presence of anatomic variants. (medscape.com)
  • CONCLUSIONS Magnesium dilates both the epicardial and resistance coronary arteries in humans. (bmj.com)
  • Objective -To develop and assess the reproducibility of a protocol to noninvasively test endothelial function in dogs on the basis of the flow-mediated vasodilation (FMD) procedure used in humans. (avma.org)
  • Introduction: Flow mediated-dilation (FMD) is a non- invasive test of endothelial function based on shear stress- dependent nitric oxide secretion causing vasodilation. (actapress.com)
  • This finding is present when areas of artery narrowing due to fibrous tissue and webs alternate with areas of artery enlargement or dilation. (medscape.com)
  • An aneurysm is a bulging of the artery caused by the weakening of the walls of the artery. (southnassau.org)
  • This technique refers to a procedure where the stent is placed partially into the aneurysm and into the afferent artery, and then the portion of the stent protruding into the aneurysm fundus provides neck support for the subsequent successful coiling. (ajnr.org)
  • The most common finding is the string-of-beads appearance, caused by areas of relative stenoses or webs alternating with small fusiform or saccular aneurysms of the artery. (medscape.com)
  • Although FMD is a pathologic diagnosis, a characteristic angiographic change is the string-of-beads appearance (see the images below) caused by areas of relative stenoses or webs alternating with small fusiform or saccular aneurysms of the artery. (medscape.com)
  • Renovascular hypertension (RVHT) denotes nonessential hypertension in which a causal relationship exists between anatomically evident arterial occlusive disease and elevated blood pressure (see the images below). (medscape.com)
  • The circle of Willis, located at the base of the brain, provides the main route for collateral blood flow in severe occlusive disease of the internal carotid artery (ICA). (ajnr.org)
  • OBJECTIVE To determine how magnesium affects human coronary arteries and whether endothelium derived nitric oxide (EDNO) is involved in the coronary arterial response to magnesium. (bmj.com)
  • Endothelium forms the inner cellular lining of blood vessels and plays an important role in many physiological functions including the control of vasomotor tone. (hindawi.com)
  • The endothelium forms the inner cellular lining of blood vessels. (hindawi.com)
  • Cerebral endothelium is probably one of the most specific types since it is the crucial element of the well-known blood-brain barrier. (hindawi.com)
  • Endothelium dependent and independent relaxation was not impaired in arteries from patients. (bmj.com)
  • PATIENTS 17 patients with angiographically normal coronary arteries. (bmj.com)
  • On average, ocular blood flow (OBF) is reduced in glaucoma patients in various tissues of the eye. (molvis.org)
  • In the present study, we therefore investigated the effects of short-term isoflavone-intact soya protein ingestion on basal coronary arterial tone and stimulated vasoreactivity and blood flow in patients with CHD (coronary heart disease) or risk factors for CHD. (portlandpress.com)
  • p=0.03) were enhanced in arteries from patients with NPG. (bmj.com)
  • p=0.02) in control arteries but not in those from patients. (bmj.com)
  • Functional abnormalities, including reduced blood flow velocity and increased resistance in a number of ocular arteries, have been demonstrated within the ophthalmic circulation of patients with NPG. (bmj.com)
  • The aim of this study was to investigate the feasibility of 2-D blood flow quantification using high-frame-rate, contrast-enhanced ultrasound (HFR-CEUS) and particle image velocimetry (PIV), or echoPIV, in patients with aortoiliac stents. (utwente.nl)
  • Il s'agit d'une étude transversale, monocentrique et descriptive, durant 12 mois, incluant les patients âgés d'au moins 18 ans admis en réanimation polyvalente pour un sepsis ou choc septique. (bvsalud.org)
  • In the past few decades the immense development of neuroradiological methods enabled better imaging of cerebral blood vessels. (hindawi.com)
  • Blood flow through the body is regulated by the size of blood vessels, by the action of smooth muscle, by one-way valves, and by the fluid pressure of the blood itself. (onteenstoday.com)
  • Which blood vessels have smooth muscle and can be controlled by the nervous system? (onteenstoday.com)
  • Smooth muscle is present in the blood vessels. (onteenstoday.com)
  • The area between the blood vessels (capillaries) and the brain's neural cells. (caringmedical.com)
  • Ultrasonography is also used in the diagnosis of disorders affecting blood vessels in other parts of the body. (msdmanuals.com)
  • Because these procedures can show the direction and rate of blood flow in the chambers and blood vessels of the heart, they enable doctors to evaluate the structure and function of these parts. (msdmanuals.com)
  • Carotid duplex ultrasound: An ultrasound that measures the velocity of blood flow in the carotid arteries. (southnassau.org)
  • Ultrasound remains the ultimate method for real time functional cerebral blood flow imaging. (hindawi.com)
  • This narrative review describes the main applications of de la ultrasonografía en ultrasound in anesthesia, ultrasound-guided techniques, and current trends in the perioperative anesthetic management of anestesia the surgical patient. (bvsalud.org)
  • Received 11 February 2010 for blood velocity estimation using medical ultrasound scanners. (lu.se)
  • The data for the estimation is created by focusing the z is the blood velocity along the ultrasound direction, c=1540 m/s is the speed of propagation, and f ultrasound transducer array along a single direction and c the emitted ultrasound (center) frequency (typically sampling data at the depth of interest. (lu.se)
  • A Deep Venous Thrombosis (DVT) is a blood clot that forms in the deep veins in the body. (southnassau.org)
  • Does smooth muscle controls blood flow through arteries and veins and controls blood pressure? (onteenstoday.com)
  • While most people understand that there are arteries (vertebral and carotid) that supply the brain with blood, oxygen, and nutrients, few are aware that there is an intricate network of lymphatic cells and veins to drain the brain. (caringmedical.com)
  • My article is about problems of compression and slow or interrupted drainage or outflow of the blood from the brain via the internal jugular veins that may cause some neurologic-type symptoms. (caringmedical.com)
  • The simultaneous occurrence of a peak in the concentration of blood deltamethrin and a peak in the mean cerebral blood flow further supports the relationship between the exposure to deltamethrin and the increase in cerebral blood flow. (cdc.gov)
  • Abnormal connections between an artery and a vein or between heart chambers can also be detected. (msdmanuals.com)
  • It is possible to perform reproducible measurements of flow volume in the CCA of newborn infants. (bmj.com)
  • A-5: Digital subtraction angiogram obtained during balloon angioplasty of a stenotic artery. (medscape.com)
  • First visit, subjects were laid down on a medical bed, in which resting pressure, maximal/minimal artery diameter, and blood flow velocity of the carotid artery were obtained. (wku.edu)
  • Giant cell arteritis is inflammation of the walls of the arteries, most commonly in the arteries in the head. (southnassau.org)
  • The wall shear stress (WSS) was measured based on the same acquisitions, by analyzing blood flow velocities close to the carotid walls. (frontiersin.org)
  • Conventional flush aortogram in a 47-year-old woman with difficult-to-control hypertension shows the characteristic string-of-beads sign of the right renal artery due to medial fibroplasia. (medscape.com)
  • Although cerebrovascular impairments are believed to contribute to concussion symptoms, little information exists regarding brain vasomotor control in adolescent concussion, particularly autoregulatory control that forms a fundamental response mechanism during changes in blood pressure. (uwo.ca)
  • Dynamic rate of regulation was calculated as the rate of change in cerebrovascular resistance relative to the change in arterial blood pressure. (uwo.ca)
  • it most commonly manifests as hypertension caused by RAS or as strokes caused by carotid artery disease. (medscape.com)
  • The disease typically affects the renal and extracranial carotid arteries, but it has also been noted in most medium-sized arteries throughout the body, most commonly the mesenteric, external iliac, and brachial arteries. (medscape.com)
  • Contrast-enhanced axial CT images show several narrowings of the common and proper hepatic arteries with intervening aneurysmal dilatation. (medscape.com)