Long-Term Graft Patency After Off-Pump and On-Pump Coronary Artery Bypass: A CORONARY Trial Cohort

Background. Randomized controlled trials have compared the early and midterm prognosis of on-pump coronary artery bypass grafting (CABG) and off-pump CABG. However the results are controversial, and there is limited information on graft patency and long-term outcomes.Methods. Between May 2007 and October 2011, 349 patients were randomized to off-pump or on-pump CABG as part of the CORONARY trial at Fuwai Hospital. The primary outcome was coronary bypass graft patency, which was assessed at a mean of 6.7 +/- 1.7 years after surgery by multidetector computed tomography. A secondary endpoint was a composite outcome of death, nonfatal myocardial infarction, repeat coronary revascularization, or stroke; mean follow-up was 6.5 +/- 1.7 years. Graft patency was compared between the off-pump and on-pump CABG treatment arms in 206 patients with follow-up computed tomography.Results. During the follow-up period 107 patients were in the off-pump CABG group and 99 in the on-pump group. These patients underwent a total of 723 grafts, and the overall rate of graft patency did not differ significantly between the off-pump and on-pump groups (87.4% vs 88.9%, P = .527). The patency rate of the posterior descending branch was lower than average. Higher incidences of mortality, nonfatal myocardial infarction, and repeat revascularization were found in the off-pump patients; however it did not reach significance.Conclusions. There were no statistical differences in graft patency rates in off-pump versus on-pump CABG patients during long-term follow-up. The on-pump CABG group appeared to have a better long-term prognosis even with no statistical differences for the limited study population. (C) 2020 by The Society of Thoracic Surgeons