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Definition of of a heart attack?

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a sudden and sometimes fatal occurrence of coronary thrombosis, typically resulting in the death of part of a heart muscle.

User Josh Werts
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The death of heart muscle due to the loss of blood supply. The loss of blood supply is usually caused by a complete blockage of a coronary artery, one of the arteries that supplies blood to the heart muscle. Death of the heart muscle, in turn, causes chest pain and electrical instability of the heart muscle tissue.

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