What is the condition caused by death of heart muscle cells?

The condition caused by death of heart muscle cells is called myocardial infarction, commonly known as a heart attack. It occurs when blood flow decreases or stops to a part of the heart, causing damage and death to the heart muscle. The most common cause of a heart attack is a blood clot that blocks one of the coronary arteries, the blood vessels that supply oxygen-rich blood to your heart muscle.