Fig. 1

Patient inclusion flow chart. From 3.951 patients operated on in the inclusion period, 288 presented with preoperative LVEF ≤35%. Of these, 84 patients received prophylactic LS and 204 did not. After propensity score matching, 246 patients remained in the analysis with 82 patients in the LS group and 164 patients in the control group. Abbreviations: CABG: Coronary artery bypass grafting surgery, LS: Levosimendan, LVEF: Left-ventricular ejection fraction