DPP4 and myocardial infarction: This was mainly pronounced in patients with conserved left ventricular (LV) function (LV ejection fraction (LVEF) >50%), in whom prior myocardial infarction significantly reduced pre-operative DPP4 activity levels by 29% (±14%) towards the lower level observed in patients with severely reduced LV function (LVEF < 30%) (Suppl.