arrhythmia. transvenous anything that passes through a vein (catheter or
pacemaker lead) tricuspid regurgitation tricuspid valve leaks and blood is pro¬pelled backwards from the right ventricle into the right atrium
and into the neck veins.
U
unstable angina severe angina usually occurring at rest.
V
valvular pertaining to the heart valves.
valvular disorders disease of heart valves, particularly mitral
stenosis, mitral regurgitation, aortic stenosis, and aortic
regurgitation.
valvular heart disease pertaining to diseases of the heart and the heart valves.
vasculitis inflammation of the walls of a blood vessel.
vasoconstriction narrowing, decrease in the diameter of veins or arteries.
vasodilatory dilatation of the lumen of arteries or veins; this increases blood flow.
venodilatation dilation of veins, as may occur during hot weather, hot baths, and by some drugs such as ACE inhibitors and nitroglycerin.
ventricle one of the two lower chambers of the heart.
ventricular cavity the chamber of the ventricle.
ventricular dysfunction poor contractility of the ventricle usually causing a decrease in ejection fraction.
ventricular fibrillation the heart muscle does not contract but quivers; therefore, there is no heartbeat (cardiac arrest) and no blood is pumped out of the heart; death occurs within minutes if the abnormal heart rhythm is not corrected. Note that in atrial fibrillation, the atrium fibrillates but the ventricles contract normally although faster than normal; this condition is usually not life-threatening and is easily controlled with the commonly known heart drug digoxin.

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