Key result
High positive end-expiratory pressure (HPEEP) significantly increased PaO2 by a mean difference of 29.38 mmHg compared to low PEEP during laparoscopic surgery in non-obese patients.
Why the study?
Higher positive end-expiratory pressure (PEEP) during laparoscopic surgery may increase oxygenation and respiratory compliance, prompting a comparison of different intraoperative PEEP strategies in non-obese patients.
Does high or individualized PEEP improve oxygenation and respiratory compliance compared to low or moderate PEEP in non-obese patients undergoing laparoscopic surgery?
Meta-Analysis (n=1,554)
Does high or individualized PEEP improve oxygenation and respiratory compliance compared to low or moderate PEEP in non-obese patients undergoing laparoscopic surgery?
High and individualized PEEP strategies during laparoscopic surgery in non-obese patients improve oxygenation and respiratory compliance without clinically significant hemodynamic changes.
Supports high/individualized PEEP in non-obese laparoscopic surgery for oxygenation gains; extends meta-analytic evidence confirming compliance benefits without hemodynamic effects.
Background. Higher positive end-expiratory pressure (PEEP) during laparoscopic surgery may increase oxygenation and respiratory compliance. This meta-analysis aimed to compare the impact of different intraoperative PEEP strategies on arterial oxygenation, compliance, and hemodynamics during laparoscopic surgery in non-obese patients. Methods. We searched RCTs in PubMed, Cochrane Library, Web of Science, and Google Scholar from January 2012 to January 2022 comparing the different intraoperative PEEP (Low PEEP (LPEEP): 0 mbar; Moderate PEEP (MPEEP): 5–8 mbar; high PEEP (HPEEP): >8 mbar; individualized PEEP - iPEEP) on arterial oxygenation, respiratory compliance (Cdyn), mean arterial pressure (MAP), and heart rate (HR). We calculated mean differences (MD) with 95% confidence intervals (CI), and predictive intervals (PI) using random-effects models. The Cochrane Bias Risk Assessment Tool was applied. Results. 21 RCTs (n = 1554) met the inclusion criteria. HPEEP vs LPEEP increased PaO2 (+ 29.38 [16.20; 42.56] mmHg, p < 0.0001) or PaO2/FiO2 (+ 36.7 [+ 2.23; +71.70] mmHg, p = 0.04). HPEEP vs MPEEP increased PaO2 (+ 22.00 [+ 1.11; +42.88] mmHg, p = 0.04) or PaO2/FiO2 (+ 42.7 [+ 2.74; +82.67] mmHg, p = 0.04). iPEEP vs MPEEP increased PaO2/FiO2 (+ 115.2 [+ 87.21; +143.20] mmHg, p < 0.001). MPEEP vs LPEP, and HPEEP vs MPEEP increased PaO2 or PaO2/FiO2 significantly with different heterogeneity. HPEEP vs LPEEP increased Cdyn (+ 7.87 [+ 1.49; +14.25] ml/mbar, p = 0.02). MPEEP vs LPEEP, and HPEEP vs MPEEP didn’t impact Cdyn (p = 0.14 and 0.38, respectively). iPEEP vs LPEEP decreased driving pressure (-4.13 [-2.63; -5.63] mbar, p < 0.001). No significant differences in MAP or HR were found between any subgroups. Conclusion. HPEEP and iPEEP during PNP in non-obese patients may improve oxygenation, increase Cdyn without clinically significant changes in MAP and HR. MPEEP could be insufficient to increase respiratory compliance and improve oxygenation. LPEEP could lead to hypoxemia and decreased respiratory compliance. PROSPERO REGISTRATION: CRD42022362379; registered October 09, 2022
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Arinova et al. (2023) conducted a meta-analysis in Laparoscopic surgery in non-obese patients (n=1,554). High positive end-expiratory pressure (HPEEP) vs. Low positive end-expiratory pressure (LPEEP) was evaluated on Arterial partial pressure of oxygen (PaO2) (MD 29.38, 95% CI 16.20-42.56, p=<0.0001). High positive end-expiratory pressure (HPEEP) significantly increased PaO2 by a mean difference of 29.38 mmHg compared to low PEEP during laparoscopic surgery in non-obese patients.
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