Causes heart attack

The heart is a muscle, and like any other muscle, it needs oxygen to stay alive. When all or part of the heart muscle dies due to lack of oxygen, it is called a heart attack or myocardial infarction. Each year more than 1.5 million Americans suffer heart attacks, and about one out of three of them dies.

Many heart attacks are caused by blood clots. When blood flows through an artery of the heart that has been narrowed by atherosclerosis, it slows down and tends to clot. When the clot becomes big enough, it cuts off the blood supply to the portion of the heart muscle below the clot, and that part of the heart muscle begins to die.

Heart attack can also occur when the heartbeat becomes irregular. In severe cases this condition, known as arrhythmia, can prevent sufficient blood from reaching the heart muscle.

Causes heart attack

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