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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Implantable Cardioverter Defibrillator

A device used in patients at risk for recurrent, sustained ventricular tachycardia or fibrillation. Leads positioned inside the heart or on its surface are used to deliver electrical shocks, sense the cardiac rhythm and pace the heart, as needed. The leads are tunneled to a pulse generator implanted in a pouch beneath the skin of the chest or abdomen.

Inferior Vena Cava

A major vein that carries blood from the lower body (legs and abdomen) to the heart.

Intermittent Claudication

Cramping or fatigue in the legs and buttocks during activity that subsides when a person stands still. It’s a common, early symptom of peripheral artery disease.


Reduced blood flow to an organ, usually due to a constricted or blocked artery.

Ischemic Heart Disease (Coronary Artery Disease, Coronary Heart Disease)

This term is applied to heart ailments caused by narrowed coronary arteries and characterized by a reduced blood supply to the heart.

Ischemic Stroke

The death of or injury to brain cells caused when a blood clot or other particle blocks a cerebral artery. Cerebral thrombosis and cerebral embolism are ischemic strokes.