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Heart Attack : What is the disease?

Myocardial or Cardiac infarction or Heart attack may be defined as infarction (death) of an area of the heart muscle, usually as a result of occlusion or blockage of a coronary artery (vessel supplying the heart with oxygen rich blood). Infarction occurs as a result of a sudden insufficiency of blood supply either due to some obstruction, pressure, clot or the artery twisting upon itself which in turn produces an area of necrosis (death of cells, tissue, or part of the organ). Death of the heart muscle often causes chest pain and electrical instability of the heart muscle tissue resulting in a malfunction or sudden death.

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