Propensity score analysis of early and late outcome after redo off-pump and on-pump coronary artery bypass grafting

Background: The purpose of this study was to compare early and late results of redo-CABG with (redo-ONCAB) and without (redo-OPCAB) cardiopulmonary bypass. Methods: From April 2001 to September 2006 redo-CABG was performed in 110 patients (redo-ONCAB = 50 and redoOPCAB = 60). Applying the propensity score, 43 OPCAB patients were matched with 43 ONCAB patients. The mean EuroScore was 5 4.7 and 5 3.4forredo-ONCABandredo-OPCAB,respectively(p = 0.5).Thenumberofdiseasedcoronaryarterieswas3 0.5and2 0.8inredo-ONCAB andredo-OPCAB,respectively(p < 0.01).Results:TwelvepatientsunderwentOPCABthroughanteriorthoracotomywhiletherestofthepatients (n = 74) underwent median sternotomy. Mean number of grafts performed was 3 0.8 in redo-ONCAB and 2 0.6 in redo-OPCAB (p < 0.05). The need for postoperative insertion of intra-aortic balloon pump (IABP) was higher (p = 0.02) in redo-ONCAB (n = 9, 21%) than redo-OPCAB (n =1 , 2%). The duration of postoperative ventilation was 55 98.7 h for redo-ONCAB and 10 12.8 h for redo-OPCAB (p = 0.008). No differences were found in the incidence of other postoperative complications. The 30-day mortality rate was 6.9% for redo-ONCAB (n = 3) and 2.3% redo-OPCAB (n =1 ;p = NS). Meanfollow-up forredo-ONCABwas 30 21.3months(range0.1—63months)andthatof redo-OPCABwas37 19.2months(0.1— 62.5 months). Actuarial survival at 5 years was 87 5.5% for redo-ONCAB and 95 3.2% for redo-OPCAB (p = 0.17). Event-free survival was 71 8.0% for redo-ONCAB and 78 7.2% for redo-OPCAB (p = 0.32). Conclusion: OPCAB is an acceptable strategy in selected patients requiring redo-CABG. Employing a strategy of OPCAB for those patients with 2 or fewer lesions and ONCAB for those with more diffuse disease, redo-OPCAB and redo-ONCAB have similar early and late outcomes. # 2007 European Association for Cardio-Thoracic Surgery. Published by Elsevier B.V. All rights reserved.