Clinical classification of different types of myocardial infarction

Type 1: spontaneous myocardial infarction related to ischaemia due to a primary coronary event such as plaque erosion and/or rupture fissuring, or dissection

Type 2: myocardial infarction secondary to ischaemia due to either decreased supply or increased demand e.g. coronary artery spasm, coronary embolism, anaemia, arrhythmias, hypertension or hypotension

Type 3: sudden unexpected cardiac death, including cardiac arrest, often with symptoms suggestive of ischaemia, accompanied by presumably new ST elevation, or new LBBB, or evidence of fresh thrombus in a coronary artery by angiography and/or at autopsy, but death occurring before blood samples could be obtained, or at a time before the appearance of cardiac markers in the blood

Type 4a: myocardial infarction associated with PCI

Type 4b: myocardial infarction associated with stent thrombosis either at angiography or at autopsy

Type 5: myocardial infarction associated with CABG

References:

1. Alpert JS et al. Myocardial infarction redefined: a consensus document of The Joint European Society of Cardiology/American College of Cardiology Committee for the redefinition of myocardial infarction. J Am Coll Cardiol. 2000;36(3):959-969
2. Chapman A et al. Assessment and classification of patients with myocardial injury and infarction in clinical practice. Heart. Volume 103, Issue 1 2016