- Myocardial infarction, commonly referred to as heart attack, is the most serious outcome of coronary heart disease, the narrowing of the arteries that supply blood to the heart muscle.
- Forty-five percent of all heart attacks occur in people younger than 65.
- Most people who have a heart attack wait two hours or more after their symptoms begin before they seek medical help, a delay that can result in death or permanent heart damage.
A myocardial infarction (MI) is damage to the heart muscle, or myocardium, that results from a lack of blood flow to the heart. The word acute is used to describe a heart attack because symptoms and damage occur suddenly. People who suffer heart attacks require immediate medical attention.