title: Worse long-term survival after off-pump than on-pump coronary artery bypass grafting.
abstract: OBJECTIVE
  To determine whether off-pump coronary artery bypass grafting (CABG) is associated with worse long-term survival compared with on-pump CABG. We performed a meta-analysis of adjusted observational studies and randomized controlled trials.
  
  
  METHODS
  MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials were searched through March 2014. Eligible studies were randomized controlled trials and adjusted observational studies (in which appropriate statistical methods adjusting for confounders had been used) of off-pump versus on-pump CABG that had reported long-term (≥5-year) all-cause mortality as an outcome.
  
  
  RESULTS
  Of 478 potentially relevant studies screened initially, 5 randomized trials and 17 observational studies, enrolling a total of 104,306 patients, were identified and included. A pooled analysis of all 22 studies demonstrated a statistically significant 7% increase in long-term all-cause mortality with off-pump relative to on-pump CABG (hazard ratio, 1.07; 95% confidence interval, 1.03-1.11; P=.0003). Although a pooled analysis of 5 randomized trials (1486 patients) demonstrated a statistically nonsignificant 14% increase in mortality with off-pump relative to on-pump CABG (hazard ratio, 1.14; 95% confidence interval, 0.84-1.56; P=.39), another pooled analysis of 17 observational studies (102,820 patients) demonstrated a statistically significant 7% increase in mortality with off-pump relative to on-pump CABG (hazard ratio, 1.07; 95% confidence interval, 1.03-1.11; P=.0004).
  
  
  CONCLUSIONS
  A meta-analysis of 22 studies, enrolling a total of >100,000 patients, showed that off-pump CABG is likely associated with worse long-term (≥5-year) survival compared with on-pump CABG.
authors.affiliation: Department of Cardiovascular Surgery, Shizuoka Medical Center, Shizuoka, Japan. Electronic address: kfgth973@ybb.ne.jp.
authors.forename: Hisato
authors.initials: H
authors.lastname: Takagi
authors.affiliation: Department of Cardiovascular Surgery, Shizuoka Medical Center, Shizuoka, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Umemoto
mesh_terms: D002315:Cardiopulmonary Bypass / Q000009:adverse effects / Q000401:mortality*; D016009:Chi-Square Distribution; D001026:Coronary Artery Bypass / Q000009:adverse effects / Q000401:mortality*; D047549:Coronary Artery Bypass, Off-Pump / Q000009:adverse effects / Q000401:mortality*; D006801:Humans; D015999:Multivariate Analysis; D064887:Observational Studies as Topic; D016017:Odds Ratio; D016016:Proportional Hazards Models; D016032:Randomized Controlled Trials as Topic; D018570:Risk Assessment; D012307:Risk Factors; D016896:Treatment Outcome