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Heart attack

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Term Definition
Heart attack

Heart attack (myocardial infarction or coronary thrombosis) is when part of the heart muscle dies because it has been starved of oxygen. Usually, this happens when a blood clot forms in one of the coronary arteries (blood vessels to the heart muscle), which blocks the blood supply. Occasionally, a blockage is caused by a spasm (sudden narrowing) of a coronary artery.

Definition from NHS Direct: Heart attack

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