title: Early and mid-term impacts of cardiopulmonary bypass on coronary artery bypass grafting in patients with poor left ventricular dysfunction: a propensity score analysis.
abstract: BACKGROUND
  Cardiopulmonary bypass may exacerbate myocardial damage in compromised left ventricles. Early and mid-term outcomes of off-pump coronary artery bypass grafting (OPCAB) vs on-pump coronary artery bypass grafting (On-pump CABG) were compared in patients with poor left ventricular dysfunction, using an analysis of a propensity score matching.
  
  
  RESULTS
  Between December 2000 and November 2005, 1,473 patients underwent isolated coronary artery bypass grafting in our institute and 153 patients who had a left ventricular ejection fraction (LVEF) lower than 35% were enrolled. The OPCAB group contained 100 patients and the On-pump CABG group contained 53 patients. Preoperative risk factors were compared and 50 patients in each group were matched. The mean follow-up time was 35.5+/-17.3 months. Three deaths (3.0%) occurred in the matched cohort, with no significant difference between 2 groups. The operation time, ventilation time, intensive care unit admission time and occurrence of respiratory failure were significantly lower in the OPCAB group. The mean LVEF of the 2 groups improved significantly. The overall 6-year actuarial survival rates of the OPCAB and On-pump CABG group were 88.2% and 72.4% (p=0.2), respectively, and there were no significant differences in 6-year rates of freedom from major adverse cardiac and cerebrovascular events (p=0.97).
  
  
  CONCLUSIONS
  Coronary artery bypass grafting in patients with poor left ventricular dysfunction improved myocardial function. Postoperative respiratory failure was significantly related to the cardiopulmonary bypass for surgical myocardial revascularization. Off-pump and On-pump surgical revascularization resulted in equivalent mid-term outcomes.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Yonsei Cardiovascular Center, Yonsei University College of Medicine, Seodaemun-Gu, Seoul, Korea.
authors.forename: Young-Nam
authors.initials: YN
authors.lastname: Youn
authors.forename: Byung-Chul
authors.initials: BC
authors.lastname: Chang
authors.forename: You-Sun
authors.initials: YS
authors.lastname: Hong
authors.forename: Young-Lan
authors.initials: YL
authors.lastname: Kwak
authors.forename: Kyung-Jong
authors.initials: KJ
authors.lastname: Yoo
mesh_terms: D000368:Aged; D002315:Cardiopulmonary Bypass; D001026:Coronary Artery Bypass; D003422:Critical Care; D018572:Disease-Free Survival; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D012131:Respiratory Insufficiency / Q000209:etiology / Q000401:mortality; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate; D013997:Time Factors; D018487:Ventricular Dysfunction, Left / Q000150:complications / Q000401:mortality / Q000601:surgery*