| Summary: | ABSTRACT Introduction: Postoperative nausea and vomiting (PONV) is the most common and unpleasant postoperative complication. There is much controversy on preoperative fluid therapy. The aim of this study was to examine the effect of crystalloid fluid (Ringer solution) versus colloid (Haemaccel solution) on the incidence of postoperative nausea and vomiting in patients receiving spinal anesthesia. Methods: In this double-blinded clinical trial, 46 patients were selected according to the inclusion and exclusion criteria. Patients were randomly allocated to one of two groups. The crystalloid group received Ringer solution at a volume of 7 ml/kg and colloid group received 7ml/kg of 3% Modified Gelatin (Haemaccel) as a preoperative intravenous bolus. We used a Verbal Rating Scale (VRS) for assessing the nausea and vomiting occurrence. Data were analyzed using SPSS software ver.13 and x2 test and independent t-test. Results: The result showed that the incidence of PONV was less frequent in both Ringer and Haemaccel groups, but the incidence of vomiting and the intensity of nausea was not significantly different in any time point after anesthesia. Conclusion: We conclude that preoperative fluid administration decreases the incidence of PONV, and both Crystalloids (Ringer) and colloids (haemaccel) solution were found to be equivalent in prevention of PONV. Therefore using of either Ringer or haemaccel solution is recommended for prevention of PONV.
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