Intraoperative supplemental oxygen has been given for most parturients undergoing cesarean section under spinal anesthesia. However, evidences supporting the practice is not clear nowadays, especially for healthy parturients who are monitored continuously with pulse oximeter. Furthermore, hyperoxia may produce free radicles which could harm fetus and newborns. Changing practice is not that easy. This study has been conducted to prove that supplemental oxygen is not necessary for healthy parturients during cesarean section.
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proportion of maternal desaturation
Timeframe: intraoperative period