Types of Myocardial Infarction - Brundage Group
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Types of Myocardial Infarction
Type I: Spontaneous myocardial infarction o Due to atherosclerotic plaque rupture, ulceration, fissuring, erosion or dissection with resulting intraluminal thrombus leading to decreased myocardial blood flow or distal platelet emboli with ensuing myocyte necrosis.
Type 2: Myocardial infarction secondary to an oxygen supply-demand mismatch o A condition other than CAD contributes to an imbalance between myocardial oxygen supply and/or demand, e.g. coronary artery spasm, anemia, respiratory failure, hypotension, sepsis, etc.
Type 3: Myocardial infarction resulting in death when biomarkers values are unavailable o Ex: a patient passes in the ED before lab work can be drawn
Type 4a: Myocardial infarction related to percutaneous coronary intervention (PCI) o Acute post-PCI troponin elevation > 5 times the 99th percentile of upper reference limit (URL) plus one of the following: Symptoms suggestive of myocardial ischemia New ischemic ECG changes or new LBBB Angiographic loss of patency of a major coronary artery Imaging demonstration of new loss of viable myocardium or new wall motion abnormality
Type 4b: Myocardial infarction related to stent thrombosis Type 5: Myocardial infarction related to coronary artery bypass grafting (CABG)
o Acute post-CABG troponin elevation > 10 times the 99th percentile URL plus one of the following: New Q waves or new LBBB Angiographic documented new graft or new native coronary artery occlusion Imaging demonstration of new loss of viable myocardium or new wall motion abnormality
*Third Universal Definition of Myocardial Infarction, Published August 2012
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