title: On-pump versus off-pump coronary-artery bypass surgery.
abstract: BACKGROUND
  Coronary-artery bypass grafting (CABG) has traditionally been performed with the use of cardiopulmonary bypass (on-pump CABG). CABG without cardiopulmonary bypass (off-pump CABG) might reduce the number of complications related to the heart-lung machine.
  
  
  METHODS
  We randomly assigned 2203 patients scheduled for urgent or elective CABG to either on-pump or off-pump procedures. The primary short-term end point was a composite of death or complications (reoperation, new mechanical support, cardiac arrest, coma, stroke, or renal failure) before discharge or within 30 days after surgery. The primary long-term end point was a composite of death from any cause, a repeat revascularization procedure, or a nonfatal myocardial infarction within 1 year after surgery. Secondary end points included the completeness of revascularization, graft patency at 1 year, neuropsychological outcomes, and the use of major resources.
  
  
  RESULTS
  There was no significant difference between off-pump and on-pump CABG in the rate of the 30-day composite outcome (7.0% and 5.6%, respectively; P=0.19). The rate of the 1-year composite outcome was higher for off-pump than for on-pump CABG (9.9% vs. 7.4%, P=0.04). The proportion of patients with fewer grafts completed than originally planned was higher with off-pump CABG than with on-pump CABG (17.8% vs. 11.1%, P<0.001). Follow-up angiograms in 1371 patients who underwent 4093 grafts revealed that the overall rate of graft patency was lower in the off-pump group than in the on-pump group (82.6% vs. 87.8%, P<0.01). There were no treatment-based differences in neuropsychological outcomes or short-term use of major resources.
  
  
  CONCLUSIONS
  At 1 year of follow-up, patients in the off-pump group had worse composite outcomes and poorer graft patency than did patients in the on-pump group. No significant differences between the techniques were found in neuropsychological outcomes or use of major resources. (ClinicalTrials.gov number, NCT00032630.).
authors.affiliation: Northport Veterans Affairs (VA) Medical Center, Northport, NY, USA.
authors.forename: A Laurie
authors.initials: AL
authors.lastname: Shroyer
authors.forename: Frederick L
authors.initials: FL
authors.lastname: Grover
authors.forename: Brack
authors.initials: B
authors.lastname: Hattler
authors.forename: Joseph F
authors.initials: JF
authors.lastname: Collins
authors.forename: Gerald O
authors.initials: GO
authors.lastname: McDonald
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Kozora
authors.forename: John C
authors.initials: JC
authors.lastname: Lucke
authors.forename: Janet H
authors.initials: JH
authors.lastname: Baltz
authors.forename: Dimitri
authors.initials: D
authors.lastname: Novitzky
mesh_terms: D001026:Coronary Artery Bypass / Q000401:mortality; D047549:Coronary Artery Bypass, Off-Pump / Q000401:mortality; D003327:Coronary Disease / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006083:Graft Occlusion, Vascular / Q000453:epidemiology; D006295:Health Resources / Q000706:statistics & numerical data; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008569:Memory Disorders / Q000175:diagnosis / Q000453:epidemiology; D008875:Middle Aged; D009483:Neuropsychological Tests; D011183:Postoperative Complications / Q000453:epidemiology; D016037:Single-Blind Method; D016896:Treatment Outcome