[0] Definition [Heart Attack] The medical term for a heart attack is myocardial infarction: a blockage of the coronary arteries leading to a decrease in blood flow. When this happens, the heart muscles die or become permanently damaged. [Sudden Cardiac Arrest (SCA)] 
SCA is a chaotic electrical condition of the heart resulting in the loss of blood flow to the brain and body. The most common form of SCA is ventricular fibrillation.