Acute myocardial infarction
An acute myocardial infarction (AMI) is a heart attack. The term "myocardial infarction" focuses on the heart muscle (the myocardium) and the changes that occur in it due to sudden (acute) deprivation of circulating blood. The main change is death (necrosis) of myocardial tissue. The interruption of blood is usually caused by arteriosclerosis with narrowing of the coronary arteries, the culminating event being a thrombosis (clot). The word "infarction" comes from the Latin "infarcire" meaning "to plug up or cram." It refers to the clogging of the artery. (The clogging frequently is initiated by cholesterol piling up on the inner wall of the blood vessels that distribute blood to the heart muscle.)

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(AMI) myocardial infarction occurring during the period when circulation to a region of the heart is obstructed and necrosis is occurring; it is usually characterized by severe pain, frequently associated with pallor, perspiration, nausea, dyspnea, and dizziness; electrographic abnormalities may include Q wave, ST segment, and T wave alterations.

Medical dictionary. 2011.

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