Miniaturized cardiopulmonary bypass improves short-term outcome in cardiac surgery: A meta-analysis of randomized controlled studies

Objective

To investigate whether the use of miniaturized cardiopulmonary bypass translates into decreased morbidity and mortality in patients having cardiac surgery.

Methods

We independently conducted a systematic review and meta-analysis of data pooled from existing trials listed in PubMed and conference proceedings. Sixteen studies were identified, including 1619 patients having cardiac surgery. Inclusion criteria were random allocation to treatment and comparison of a miniaturized cardiopulmonary bypass system versus conventional cardiac surgery. Exclusion criteria were duplicate publications, nonhuman experimental studies, and no outcome data. The end points were the rate of neurologic and myocardial damage and the number of patients transfused.

Results

Miniaturized cardiopulmonary bypass was associated with significant reductions of neurologic damage (4/548 [0.7%] vs 19/555 [3.4%], odds ratio = 0.30 [0.12–0.73], P = .008), reduction in peak cardiac troponin (weighted mean difference = –0.15 ng/dL [−0.18, −0.11], P < .001), and in the number of transfused patients (55/552 [9.9%] vs 101/563 [17.9%], odds ratio = 0.42 [0.28–0.63], P < .001). No difference in mortality was noted (8/758 [1.0%] vs 14/771 [1.8%], odds ratio = 0.60 [0.26–1.39]).

Conclusions

Miniaturized cardiopulmonary bypass has beneficial effects resulting in decreased transfusion rate and cardiac and neurologic damage.

CTSNet classification: 1, 24

Abbreviations and Acronyms: CABG, coronary artery bypass grafting, CPB, cardiopulmonary bypass, OR, odds ratio, QUOROM, The Cochrane Collaboration and the Quality of Reporting of Meta-Analyses, WMD, weighted mean differences