Survival and Mid-Term Outcomes of On Pump vs. Off Pump Coronary Artery Bypass Grafting: A Propensity Score-Matched Analysis in A First Peruvian Registry.

Introduction: The efficacy and outcomes of on-pump and off-pump coronary artery bypass grafting (CABG) remain uncertain, especially in Latin America. Our study aims to explore survival and shortand mid-term outcomes in the first reported Peruvian registry of patients treated with both techniques.

Methods: This is an observational, analytical, and longitudinal study using a propensity score-matched (PSM) analysis in a single-center retrospective registry of 2280 patients during 2000-2019; 846 patients were analyzed after PSM (on-pump = 423 vs. off-pump = 423). Baseline variables, comorbidities, and major outcomes were studied in the short term (≤ 30 days) and in midterm (30 days-36 months) with major adverse cardiac and cerebrovascular events. The matched groups were compared by descriptive, multivariate, and Kaplan-Meier survival analyses.

Results: Before PSM, previous myocardial infarction < 7 days (27.03%) and ejection fraction ≥ 50% (45.72%) were higher in off-pump CABG (P<0.05). After PSM, pre-surgery percutaneous coronary intervention (27.18% vs. 26.71%, P=0.049) and Society of Thoracic Surgeons risk score (1.98% vs. 1.90%, P=0.047) were higher in off-pump CABG. In the short term, there was higher mortality (2.12% vs. 0.47%, P=0.048), blood transfusion > 500 ml (57.91% vs. 7.56%, P=0.049), reintervention (7.32% vs. 2.12%, P=0.045), hospital stay (nine vs. four days, P=0.048), arrhythmia (9.92% vs. 4.96%, P=0.049), and renal failure (20.09% vs. 5.91%, P=0.009) in on-pump CABG. Long-term mortality (4.25% vs. 1.65%, P=0.044), myocardial infarction (17.02% vs. 7.32%, P=0.046), and repeat revascularization (17.49% vs. 8.26%, P=0.045) predominated in on-pump CABG. There was a higher 36-month adjusted survival for off-pump over on-pump CABG (97.88% vs. 93.63%, P=0.046).

Conclusion: This first reported Peruvian registry of patients treated with CABG has demonstrated that off-pump CABG is associated with lower shortand mid-term morbidity and mortality rates and better-adjusted survival rates compared to on-pump CABG; however, further multicenter studies in Latin America are needed to elucidate its benefits over classic on-pump CABG.