Perioperative hyperoxia versus normoxia during cardiopulmonary bypass in adult cardiac surgery: a systematic review and meta-analysis of randomized controlled trials
Abstract
Background: While hyperoxia has conventionally been the standard during cardiopulmonary bypass (CPB) to prevent hypoxemia, recent concerns regarding oxygen-induced oxidative stress have sparked debate over whether a normoxic strategy provides a safer clinical alternative.
Methods: A comprehensive search of PubMed, Web of Science, CENTRAL, and Scopus was conducted to identify randomized controlled trials (RCTs) through December 2025. Primary outcomes included short-term and long-term mortality, and acute kidney injury (AKI). Secondary outcomes included assessment of clinical complications and healthcare resource utilization. Risk ratios (RR) and mean differences (MD) were pooled using a random-effects model.
Results: Twelve RCTs involving 2,732 patients were included. The analysis found no significant difference between hyperoxia and normoxia in short-term mortality (RR: 1.23, 95% CI [0.60, 2.54]; p = 0.57), long-term mortality (RR: 1.10, 95% CI [0.84, 1.43]; p = 0.48), or the incidence of AKI (RR: 0.94, 95% CI [0.82, 1.07]; p = 0.32). Similarly, no significant differences were observed in secondary clinical outcomes, including myocardial infarction, stroke, arrhythmia, or surgical site infections. Hospital resource utilization was comparable, with no significant differences in mechanical ventilation duration (p = 0.06), ICU stay (p = 0.32), or length of hospital stay (p = 0.08).
Conclusion: This meta-analysis detected no statistically significant differences between…
How strong is the evidence?
Evidence Hub reads this as a meta-analysis, done in people. Its evidence level is 1 of 5 (Highest · pooled evidence). Pooled evidence from several studies sits at the top of the evidence pyramid. Reported size: 2,732 participants or records.
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