As highlighted in recent guidelines, the diagnosis of PMI after CABG should adhere to the criteria of the Fourth Universal Definition of Myocardial Infarction, which requires a postoperative increase in cardiac troponin I (cTnI) or troponin T (cTnT) exceeding 10 times the 99th percentile URL within 48 h, along with corroborating clinical, electrocardiographic, angiographic, or imaging evidence. Here, TNNI3 is linked to myocardial infarction.