Vaginal preparation with different antiseptic solutions before cesarean section for preventing postoperative infections: A systematic review and network meta-analysis

Aims: We aimed to investigate the effect of various vaginal wash solutions on reducing risks of post-cesarean endometritis, wound infections, fever, and hospital stay duration.

Methods: Scopus, Web of Science, PubMed, and Cochrane Library were searched for randomized clinical trials that compared different vaginal wash solutions to each other or to "no vaginal cleaning"; without restriction on the age of parturients or site where trials were conducted. We analyzed this frequentist network meta-analysis using the netmeta package in R software version 4.1.2; synthesized data as mean difference or risk ratio with their 95% confidence intervals.

Results: Our network meta-analysis included 29 RCTs with a total sample size of 9311 women undergoing CS. Regarding post-cesarean endometritis, we found that povidone-iodine had the highest significant risk reduction compared to "no vaginal cleaning" (RR = 0.08, 95% CI [0.01, 0.69]). While regarding post-cesarean reduction of wound infection, fever, and hospital stay duration, we found that chlorhexidine 4% (RR = 0.17, 95% CI [0.05, 0.65]), saline 0.9% (RR = 0.12, 95% CI [0.03; 0.48]), and saline 0.9% (MD = -1.29, 95% CI [-2.18; -0.39]), respectively, had the highest significant risk reduction compared to "no vaginal cleaning."

Conclusion: Vaginal wash solutions were associated with a significant reduction of post-cesarean endometritis, wound infection, fever, and hospital stay duration. Since povidone-iodine had the highest significant reduction of post-cesarean endometritis, we recommend setting povidone-iodine as the standard practice as pre cesarean vaginal wash solution; consistent practice guidelines of Enhanced Recovery After Surgery (ERAS).