Between May 1996 and January 2014, 15 436 patients underwent isolated coronary surgery. From these, we selected the study population as shown in Fig. 1. First, 349 patients were identified to have undergone any redo coronary surgery, with any primary cardiac procedure (isolated CABG, valve only or CABG plus valve/other). Of these, 143 (40.97%) received redo-OPCAB and represented the study group. The remaining 206 patients (59.03%) received redo-CABG and formed the control group. Next, we selected a subgroup of 273 of 349 redo patients with isolated coronary surgery only being the primary procedure. Of these, 100 patients (36.6%) underwent redo-OPCAB and 173 patients (63.4%) underwent redo-CABG.