TNNI3 and myocardial infarction: Administration of adrenaline led to significant increases (P<0.05) in serum cardiac troponin I (CnTn1) levels (Figure 1a), lactate dehydrogenase (Figure 1b), and muscle creatinine-kinase (CKMB) enzymes (Figure 1c) in MI only group (confirming myocardial injury) relative to the control and Vit C only groups.