This document discusses myocardial infarction (MI), also known as a heart attack. An MI occurs when a coronary artery becomes blocked, depriving the heart muscle of oxygen-rich blood. This can cause damage or death of heart muscle. Major risk factors for an MI include atherosclerosis, high blood pressure, high cholesterol, smoking, and diabetes. An MI is diagnosed through electrocardiograms (EKGs), which can show changes in the heart's electrical activity, and blood tests. Treatment focuses on opening blocked arteries through medications or procedures, preventing abnormal heart rhythms, and giving oxygen. Making lifestyle changes can help prevent MIs by lowering risk factors like quitting smoking, eating healthy, and managing stress.