ROOBY Trial conducted by Hattler B et al [Off-Pump Coronary Artery Bypass Surgery Is Associated With Worse Arterial and Saphenous Vein Graft Patency and Less Effective Revascularization. Results From the Veterans Affairs Randomized On/Off Bypass (ROOBY) Trial. Circulation. 2012; 125: 2827-2835] randomized on pump bypass surgery versus off pump bypass surgery. Over two thousand and two hundred subjects were randomized between 2002 and 2007. All results were classified using FitzGibbon classification into: A=widely patent, B=flow limited and O=occluded. The definition of effective revascularization was to have FitzGibbon A quality graft to major diseased artery in all the territories with significant disease and the absence of new post anastamotic lesions. Lower FitzGibbon A patency rates were noted with off pump coronary artery bypass grafting (CABG) than on pump CABG for arterial grafts (85.8 percent versus 91.4 percent; P=0.003) and SVG (saphenous vein grafts) (72.7 percent versus 80.4 percent; P