Depending on the symptoms and risk, treatment may be with medication, percutaneous coronary intervention (PCI) or coronary artery bypass surgery (CABG). Myocardial infarction (MI) or acute myocardial infarction (AMI), commonly known as a heart attack is caused by interruption of blood supply to parts of the heart, causing some heart cells to die. This is most commonly due to blockage of a coronary artery associated with an atherosclerotic plaque, which is an unstable collection of lipids and white blood cells in the wall of an artery. AMBS