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).
Recover Heart Attack with Repairing Cardiac Tissue by Heart Patch, Showing Hope. The most common causes of heart failure are hypertension (high blood pressure) and coronary artery disease. Uncontrolled high blood pressure, or hypertension, can cause a heart attack but it is also a major cause of heart failure even in the absence of an attack. In fact, about 75 percent of cases of heart failure start with hypertension. A heart attack is an injury to the heart muscle caused by a loss of blood supply. It usually occurs when a blood clot blocks the flow of blood through a coronary artery â a blood vessel that feeds blood to a part of the heart muscle.