The most common diagnostic criterion for myocardial infarction, or heart failure, is based on the results of an electrocardiogram, or EKG, according to the Cleveland Clinic. An alternate universal diagnostic criterion is myocardial necrosis or tissue death. The latter criterion is organized into sub-categories by clinical signs and symptoms as well as the direct cause of the coronary event.Continue Reading
Myocardial infarction occurs when the blood supply to the heart is reduced below a critical threshold needed for normal operating function and homeostasis. If this situation persists for an extended time, the result is irreversible cell damage and death.
There are five sub-types of myocardial infarction based on the clinical scenario, according to the Cleveland Clinic. Type 1 is spontaneous heart failure due to a primary coronary event, such as a rupture in the plaque that has accumulated inside a blood vessel or diminished blood supply through a blocked vessel. Type 2 is a secondary ischemia or shortage of blood from a mismatch between supply and demand. Type 3 is sudden cardiac death. Type 4a is associated with percutaneous coronary intervention, which was formerly known as angioplasty with stent. Type 4b refers to thrombosis, or a blood clot that is dislodged by the stent. Type 5 is a myocardial event associated with coronary bypass surgery.Learn more about Cardiac Health