On-pump versus off-pump coronary-artery bypass surgery: a meta-analysis

Area of Science:

• Cardiovascular Surgery
• Medical Technology Assessment
• Evidence-Based Medicine

Background:

• Controversies exist regarding the comparative benefits of off-pump coronary artery bypass grafting (OPCABG) versus on-pump coronary artery bypass grafting (ONCABG).
• A comprehensive comparison is needed to clarify the advantages and disadvantages of each surgical technique.
• Previous studies have yielded conflicting results, necessitating a robust meta-analysis.

Purpose of the Study:

• To compare the efficacy and safety of OPCABG versus ONCABG in patients undergoing coronary artery bypass surgery.
• To evaluate differences in mortality and morbidity between the two surgical techniques through a meta-analysis of randomized controlled trials.
• To provide a clearer perspective on the optimal surgical approach for coronary artery bypass grafting.

Main Methods:

• A systematic review and meta-analysis of published randomized controlled trials (RCTs) were conducted.
• Literature search performed in PubMed, Embase, B-on, and Science Direct (March 2009 - January 2010).
• Nine RCTs involving 75,086 patients were included, excluding high-risk patients and those with long-term follow-up.

Main Results:

• OPCABG was associated with an 18% reduction in cardiovascular mortality (OR: 0.82, 95%CI: 0.70-0.98, p=0.03).
• OPCABG demonstrated a significant 27% reduction in postoperative stroke risk (OR: 0.73, 95%CI: 0.63-0.85, p=0.0001).
• No significant differences were observed between OPCABG and ONCABG regarding kidney complications or sepsis.

Conclusions:

• Off-pump coronary artery bypass grafting significantly reduces the risk of major cardiovascular events, including mortality and stroke, compared to on-pump procedures.
• OPCABG appears to be a safer alternative for coronary artery bypass surgery when considering major adverse cardiovascular outcomes.
• The findings support OPCABG as a beneficial surgical technique, particularly for reducing postoperative stroke incidence.