Acute myocardial infarction is called a heart attack. It is a life-threatening condition that occurs when blood flow to the heart is abruptly cut off, causing tissue damage. This happens when a blockage occurs in one or more coronary arteries. A blockage happens due to a buildup of plaque. A plaque is a substance mostly made of fat, cholesterol, and cellular waste products. The symptoms of myocardial infarction are fatigue, chest discomfort, malaise epigastric, indigestion or of fullness and gas etc.