title: Effects of on- and off-pump coronary artery surgery on graft patency, survival, and health-related quality of life: long-term follow-up of 2 randomized controlled trials.
abstract: OBJECTIVE
  Off-pump coronary artery bypass grafting reduces postoperative morbidity and uses fewer resources than conventional surgical intervention with cardiopulmonary bypass. However, only 15% to 20% of coronary artery bypass grafting operations use off-pump coronary artery bypass. One reason for not using off-pump coronary artery bypass might be the surgeon's concern about the long-term patency of grafts performed with this technique. Therefore our objective was to compare long-term outcomes in patients randomized to off-pump coronary artery bypass or coronary artery bypass grafting with cardiopulmonary bypass.
  
  
  METHODS
  Participants in 2 randomized trials comparing off-pump coronary artery bypass and coronary artery bypass grafting with cardiopulmonary bypass were followed up for 6 to 8 years after surgical intervention to assess graft patency, major adverse cardiac-related events, and health-related quality of life. Patency was assessed by using multidetector computed tomographic coronary angiographic analysis with a 16-slice scanner. Two blinded observers classified proximal, body, and distal segments of each graft as occluded or not. Major adverse cardiac-related events and health-related quality of life were obtained from questionnaires given to participants and family practitioners.
  
  
  RESULTS
  Patency was studied in 199 and health-related quality of life was studied in 299 of 349 survivors. There was no evidence of attrition bias. The likelihood of graft occlusion was no different between off-pump coronary artery bypass (10.6%) and coronary artery bypass grafting with cardiopulmonary bypass (11.0%) groups (odds ratio, 1.00; 95% confidence interval, 0.55-1.81; P > .99). Graft occlusion was more likely at the distal than the proximal anastomosis (odds ratio, 1.11; 95% confidence interval, 1.02-1.20). There were also no differences between the off-pump coronary artery bypass and coronary artery bypass grafting with cardiopulmonary bypass groups in the hazard of death (hazard ratio, 1.24; 95% confidence interval, 0.72-2.15) or major adverse cardiac-related events or death (hazard ratio, 0.84; 95% confidence interval, 0.58-1.24), or mean health-related quality of life across a range of domains and instruments.
  
  
  CONCLUSIONS
  Long-term health outcomes with off-pump coronary artery bypass are similar to those with coronary artery bypass grafting with cardiopulmonary bypass when both operations are performed by experienced surgeons.
authors.affiliation: Bristol Heart Institute, University of Bristol, Bristol Royal Infirmary, Bristol, United Kingdom.
authors.forename: Gianni D
authors.initials: GD
authors.lastname: Angelini
authors.forename: Lucy
authors.initials: L
authors.lastname: Culliford
authors.forename: David K
authors.initials: DK
authors.lastname: Smith
authors.forename: Mark C K
authors.initials: MC
authors.lastname: Hamilton
authors.forename: Gavin J
authors.initials: GJ
authors.lastname: Murphy
authors.forename: Raimondo
authors.initials: R
authors.lastname: Ascione
authors.forename: Andreas
authors.initials: A
authors.lastname: Baumbach
authors.forename: Barnaby C
authors.initials: BC
authors.lastname: Reeves
mesh_terms: D000368:Aged; D017023:Coronary Angiography / Q000379:methods; D001026:Coronary Artery Bypass / Q000401:mortality; D047549:Coronary Artery Bypass, Off-Pump / Q000401:mortality; D005260:Female; D005500:Follow-Up Studies; D006083:Graft Occlusion, Vascular / Q000453:epidemiology*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D014654:Vascular Patency