Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway.
Coronary artery disease. The most common underlying cause of heart attack is atherosclerosis, a condition in which a fatty substance called plaque builds up on the inside walls of blood vessels. When this occurs in the coronary arteries, it's known as coronary artery disease (CAD).
Heart-related causes. Examples of heart-related causes of chest pain include: 1  Heart attack. 2  A heart attack is a result of a blood clot that's blocking blood flow to your heart muscle. 3  Angina. 4  Thick plaques can gradually build up on the inner walls of the arteries that carry blood to your heart.