Aims and background: Nausea and vomiting is one of the most common and most annoying post-operative complications, therefore, the aim of this study was to investigate the effect of oxygen therapy with Venturi mask and CPAP mask on nausea and vomiting after cesarean section. Materials and methods: This quasi-experimental study was performed on two groups (control-intervention) on 90 candidates for elective cesarean section in Ahvaz Razi Hospital.  Patients were divided into two groups: intervention (45) and control group (45). Patients in the intervention group received 100% oxygen concentration with CPAP mask and patients in the control group with concentration of 30% by Venturi mask during and up to 6 hours after the operation. Nausea rate was assessed based on the VAS criteria and the frequency of vomiting. Data were analyzed by SPSS19 software using t-test and chi-square test. Findings: The results showed that there was a significant difference between the severity of nausea and vomiting in both intervention and control groups at all postoperative times (p>0.05). The mean of severity of nausea and vomiting in the control group was more than the intervention group.It indicates the effectiveness of Cpap mask against Venturi mask on the severity of nausea and vomiting after cesarean section. Conclusion: Using oxygen at a concentration of 100% with a Cpap mask, compared to a venturi mask with a 30% delivery oxygen concentration, is able to reduce nausea and vomiting after cesarean section surgery.

Keywords: Oxygen, Venturi Mask, CPAP Mask, Postoperative Nausea and Vomiting, Cesarean section

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