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Ventricular Function, Right
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D016278 |
[The hemodynamic and electrophysiological action of the right HEART VENTRICLE.
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Ventricular Myosins
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D024723 |
[A form of ventricular myosin that contains two beta-myosin heavy chains. It has a lower ATPase activity and contracts at a slower rate than myosins containing alpha-myosin heavy chains.
, A form of ventricular myosin that contains one alpha-myosin heavy chain and one beta-myosin heavy chain. It has an ATPase activity and contraction rate that is intermediate between ventricular alpha-myosin and ventricular beta-myosin.
, A form of ventricular myosin that contains two alpha-myosin heavy chains. It has a higher ATPase activity and contracts at a faster rate than myosins containing beta-myosin heavy chains.
, Isoforms of MYOSIN TYPE II, specifically found in the ventricular muscle of the HEART. Defects in the genes encoding ventricular myosins result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.
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Ventricular Outflow Obstruction
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D014694 |
[Occlusion of the outflow tract in either the LEFT VENTRICLE or the RIGHT VENTRICLE of the heart. This may result from CONGENITAL HEART DEFECTS, predisposing heart diseases, complications of surgery, or HEART NEOPLASMS.
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Ventricular Premature Complexes
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D018879 |
[A type of cardiac arrhythmia with premature contractions of the HEART VENTRICLES. It is characterized by the premature QRS complex on ECG that is of abnormal shape and great duration (generally >129 msec). It is the most common form of all cardiac arrhythmias. Premature ventricular complexes have no clinical significance except in concurrence with heart diseases.
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Ventricular Pressure
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D017725 |
[The pressure within a CARDIAC VENTRICLE. Ventricular pressure waveforms can be measured in the beating heart by catheterization or estimated using imaging techniques (e.g., DOPPLER ECHOCARDIOGRAPHY). The information is useful in evaluating the function of the MYOCARDIUM; CARDIAC VALVES; and PERICARDIUM, particularly with simultaneous measurement of other (e.g., aortic or atrial) pressures.
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Ventricular Remodeling
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D020257 |
[The geometric and structural changes that the HEART VENTRICLES undergo, usually following MYOCARDIAL INFARCTION. It comprises expansion of the infarct and dilatation of the healthy ventricle segments. While most prevalent in the left ventricle, it can also occur in the right ventricle.
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Ventricular Septal Rupture
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D018658 |
[Presence of a hole or holes in the ventricular septum.
, Laceration or tearing of the VENTRICULAR SEPTUM, usually caused by MYOCARDIAL INFARCTION.
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Ventricular Septum
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D054088 |
[The muscular structure separating the right and the left lower chambers (HEART VENTRICLES) of the heart. The ventricular septum consists of a very small membranous portion just beneath the AORTIC VALVE, and a large thick muscular portion consisting of three sections including the inlet septum, the trabecular septum, and the outlet septum.
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Ventriculography, First-Pass
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D015646 |
[Radionuclide ventriculography where a bolus of radionuclide is injected and data are recorded from one pass through the heart ventricle. Left and right ventricular function can be analyzed independently during this technique. First-pass ventriculography is preferred over GATED BLOOD-POOL IMAGING for assessing right ventricular function.
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Ventriculoperitoneal Shunt
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D017287 |
[Surgical creation of a communication between a cerebral ventricle and the peritoneum by means of a plastic tube to permit drainage of cerebrospinal fluid for relief of hydrocephalus. (From Dorland, 28th ed)
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Ventriculostomy
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D014696 |
[Surgical creation of an opening in a cerebral ventricle.
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Ventromedial Hypothalamic Nucleus
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D014697 |
[A nucleus of the middle hypothalamus, the largest cell group of the tuberal region with small-to-medium size cells.
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Venturicidins
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D014698 |
[Toxic substances isolated from various strains of Streptomyces. They are 20-membered macrolides that inhibit oxidative phosphorylation and mitochondrial ATPases. Venturicidins A and B are glycosides. Used mainly as tools in the study of mitochondrial function.
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Venules
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D014699 |
[The minute vessels that collect blood from the capillary plexuses and join together to form veins.
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Venus
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D018536 |
[The second planet in order from the sun. It has no known natural satellites. It is one of the four inner or terrestrial planets of the solar system.
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Verapamil
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D014700 |
[A calcium channel blocker that is a class IV anti-arrhythmia agent.
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Veratridine
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D014701 |
[A benzoate-cevane found in VERATRUM and Schoenocaulon. It activates SODIUM CHANNELS to stay open longer than normal.
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Veratrine
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D014702 |
[A voltage-gated sodium channel activator.
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Veratrum
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D014703 |
[A plant genus of the family Melanthiaceae with roots that contain VERATRUM ALKALOIDS used as emetics, parasiticides, antihypertensives. The common name "black hellebore" is used for both Veratrum nigrum and HELLEBORUS NIGER.
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Veratrum Alkaloids
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D014704 |
[Alkaloids with powerful hypotensive effects isolated from American or European Hellebore (Veratrum viride Ait. Liliaceae and Veratrum album L. Liliaceae). They increase cholinergic and decrease adrenergic tone with appropriate side effects and at higher doses depress respiration and produce cardiac arrhythmias; only the ester alkaloids have been used as hypotensive agents in specific instances. They have been generally replaced by drugs with fewer adverse effects.
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