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M

Term Definition
Mini-stroke

see "TIA"

Mitral regurgitation (insufficiency)

Failure of the mitral valve to close properly, permitting some blood to flow backwards into the left atrium rather than moving forward into the left ventricle.

Mitral valve

One of four heart valves, it maintains the one-way flow of blood from the left atrium to the left ventricle by opening and shutting as the heart muscle expands and contracts. Also called the bicuspid valve.

Mitral valve prolapse

A congenital abnormality in which the flaps of tissue that make up the mitral valve are larger than normal.

Monounsaturated fats

Fatty acids found in foods such as olive oil and nuts. When monounsaturated fats are substituted for saturated fats, cholesterol levels improve.

MR venography

an alternative to the standard venography test to diagnose deep vein thrombosis and vein disease; this test uses a magnetic resonance imaging (MRI) scanner and an injected dye to produce images of the veins and blood flow through them

Mucocutaneous lymph node syndrome

See Kawasaki disease.

Multigated acquisition (MUGA scan)

A radioisotope test used to measure heart functioning and performance.

Multivessel disease

Disease of the blood vessels in which more than one vessel (usually arteries) is blocked or impaired in some way.

Murmur

See Heart murmur.

Myocardial infarction

Commonly known as heart attack. The death of heart tissue from a blockage in a coronary artery.

Myocarditis

An inflammation of the heart muscle.

Myocardium

The heart muscle.

Myopathy

Muscle weakness.

Myxomatous degeneration

A metabolic process in which valve tissue loses its elasticity and becomes redundant.

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