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Term Definition

see Implantable cardioverter defibrillator

Implantable cardioverter defibrillator (ICD)

A battery-powered device implanted in the chest to monitor and, if necessary, correct episodes of serious abnormal heart rhythms that can cause sudden death

In-stent restenosis

Narrowing of artery walls due to the buildup of scar tissue around the stent. See Restenosis.


Tissue death caused by oxygen deprivation.

Inferior vena cava

A large vein that returns blood from the legs and abdomen to the heart.


any drug that affects the strength of the heart muscle's contractions; sometimes used to treat advanced heart failure; the most commonly used inotrope is digitalis


A hormone that regulates blood sugar (glucose) levels in the blood by converting excess glucose to glycogen.

Insulin resistance

When the body does not respond properly to insulin and is unable to regulate blood sugar. Insulin resistance is associated with type 2 diabetes.

Insulin resistance syndrome

See Metabolic Syndrome.

Intermittent claudication

See Claudication.

Interventional cardiologist

A cardiologist who specializes in interventional technologies such as cardiac catheterization and angioplasty.


The inner layer of the arterial wall.

Intracerebral hemorrhage

bleeding within the brain

Intravenous (IV)

Within a vein, a common mode of delivering medication.

Invasive test

A test or procedure that penetrates the body or punctures the skin.

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