This document defines myocardial infarction as the death of heart muscle cells due to inadequate blood flow. Common causes include atherosclerosis and blood clots. Signs and symptoms include chest pain, shortness of breath, arrhythmias, nausea, sweating, and fatigue. Diagnostic tests include electrocardiograms and blood tests to detect elevated markers. Treatment involves medications to relieve symptoms, break up clots, and prevent complications like aspirin, nitrates, thrombolytics, and beta blockers. Surgical procedures like bypass surgery or angioplasty may also be used in severe cases.