Off-Pump vs. On-Pump CABG: Beating-Heart vs. Traditional Bypass Surgery

Coronary Artery Bypass Grafting (CABG) Approaches

Off-Pump CABG (OPCAB) — "Beating Heart"

• Heart continues beating; no cardiopulmonary bypass (CPB) machine.
• Mechanical stabilizers immobilize target vessel segment.
• Potential benefits: less systemic inflammation, reduced transfusion, lower stroke risk (no aortic manipulation), faster recovery, shorter ICU/hospital stay.
• Challenges: Technically demanding; limited to accessible vessels; hemodynamic instability during positioning.

On-Pump CABG (ONCAB) — "Traditional"

• CPB machine oxygenates and circulates blood; heart arrested (cardioplegia).
• Still, bloodless field; all vessels accessible.
• Gold standard for complex/multivessel disease, poor targets, reoperations.
• Risks: CPB-related inflammation, hemodilution, microemboli, AKI, neurocognitive decline.

Evidence & Selection

• RCTs (ROOBY, CORONARY, DOCTORS) show similar 1–5 year mortality/graft patency.
• OPCAB may reduce stroke, AKI, transfusion in selected patients.
• Surgeon expertise and volume are critical determinants of outcome for either approach.
• Hybrid: OPCAB + PCI (stent) for diffuse disease.

Decision individualized: anatomy, comorbidities, surgeon experience, institutional outcomes.