Empagliflozin in Acute Myocardial Infarction in Patients with and Without Type 2 Diabetes: A Pre-Specified Analysis of the EMPACT-MI Trial

AIMS: In the EMPACT-MI trial, empagliflozin reduced heart failure (HF) hospitalizations but not mortality in acute myocardial infarction (MI). Contemporary reports of clinical event rates with and without type 2 diabetes mellitus (T2DM) in acute MI trials are sparse. The treatment effect of empagliflozin in those with and without T2DM in acute MI is unknown. METHODS AND RESULTS: A total of 6522 patients with acute MI with newly reduced left ventricular ejection fraction (LVEF) to <45%, congestion, or both, were randomized to empagliflozin 10 mg or placebo. The primary endpoint was time to first HF hospitalization or all-cause death. Rates of endpoints with and without T2DM and the efficacy and safety of empagliflozin according to T2DM status were assessed. Overall, 32% had T2DM; 14% had pre-diabetes; 16% were normoglycaemic; 38% had unknown glycaemic status. Patients with T2DM, compared to those without T2DM, were at higher risk of time to first HF hospitalization or all-cause death (hazard ratio [HR] 1.44; 95% confidence interval [CI] 1.06-1.95) and all-cause death (HR 1.70; 95% CI 1.13-2.56). T2DM did not confer a higher risk of first HF hospitalization (HR 1.22, 95% CI 0.82-1.83). Empagliflozin reduced first and total HF hospitalizations, but not all-cause mortality, regardless of presence or absence of T2DM. The safety profile of empagliflozin was the same with and without T2DM. CONCLUSION: Patients with acute MI, LVEF <45% and/or congestion who had T2DM were at a higher risk of mortality than those without T2DM. Empagliflozin reduced first and total HF hospitalizations regardless of the presence or absence of T2DM.