TNNI3 and myocardial infarction: Cardiac troponin I (cTnI) has been found to have excellent sensitivity and specificity as an indicator of myocardial necrosis [17], the median levels of cTnI in our study were 0, 0.005 (0, 0.02), 0.003 (0, 0.014) and 0.08 (0.06, 1.1) μg/L from Control subjects, SCAD, UA to MI patients, respectively.