ENHO and myocardial infarction: However, there have been contradictory reports from animal studies that examined the association between adropin expression and isoproterenolinduced myocardial infarction, which indicated that the gradual increase in serum adropin levels could serve as an alternative to troponin I measurement for diagnosing EPACS,19 and human studies, showing that single-timing serum adropin levels were lower in EPACS patients than in stable angina pectoris (SAP) patients or controls.20