Selected pre- and intraoperative clinical data.

aCategorical variables are presented as the number (%) and continuous variables as the mean ± standard deviation;bthe term “smoking” comprises active smokers and the individuals who had given up smoking within one year before surgery;call severely stenotic or occluded native coronary arteries were bypassed.Abbreviations: BMI = body mass index; CAD = coronary artery disease; CCAB = conventional coronary artery bypass (in the extracorporeal circulation); LITA = left internal thoracic artery; LVEF = left ventricular ejection fraction (by echocardiography); OPCAB = off-pump coronary artery bypass; PCI = percutaneous coronary intervention; RA = radial artery; RITA = right internal thoracic artery.