Postoperative nausea and vomiting (PONV) is one of the most common complications in the patients undergoing strabismus surgery. The aim of current study was comparing supplemental 80% and 40% oxygen on reducing postoperative nausea and vomiting in the pediatrics undergoing strabismus surgery. Materials and Methods: In this clinical trial study, 100 pediatric patients scheduled for strabismus surgery under general anesthesia were allocated randomly into two parallel supplemental 80% and 40%

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... n groups during surgery. PONV in patients was compared until 24hrs after operation. Results: In the first 6hrs postoperatively, PONV in the supplemental 40% and 80% oxygen groups were 48.8% and 30.6% respectively, also were 20.8% and 12.2% in the 6 to 24hrs postoperatively. Therefore, there were no significant differences between both groups in regarding of PONV in 6hrs and 6 to 24hrs postoperatively (p values were 0.18 and 0.25, respectively). Conclusion: According to our results, there is no any difference between 40% and 80% oxygen postoperatively in the pediatrics undergoing strabismus surgery.