TNNT2 and ST Elevation Myocardial Infarction: In this study, by monitoring the peak levels of hs-cTnT, CKMB and NT-proBNP, we found that the higher the MIRI manifestation grade of STEMI patients, the higher was the biomarker level of myocardial injury and the lower was the grade of STEMI patients who also had myocardial injury.