Glossary of Terms

This glossary of terms has been compiled for your reference. Select the first letter of the word you’re searching for to begin.

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Pertaining to blood vessels.


A group of drugs that cause the muscle in the walls of the blood vessels (especially the arterioles) to relax, allowing the vessels to dilate.


One of a series of vessels that carries blood from various parts of the body back to the heart.


One of the two lower chambers of the heart.

Ventricular Fibrillation

A condition in which the ventricles contract in an extremely fast, chaotic fashion so no blood is pumped from the heart.

Ventricular Septal Defect (VSD)

A congenital heart defect in which an opening exists between the heart’s two lower chambers.

Ventricular Tachycardia

A condition in which an area of the ventricle muscle develops pacemaker activity, resulting in a very fast, abnormal heartbeat.


Small veins, the blood vessels that carry blood back to the heart and lungs.