CTNS and myocardial infarction: According to the fourth definition of myocardial infarction, the three diagnostic pillars for acute myocardial infarction (AMI) include typical symptoms, typical ECG changes, and a fall or rise in cardiac enzymes—preferably cardiac troponin (cTn) with one of the cTns being above the 99th percentile of the upper reference limit (URL) [1].