high intravenous fluid therapy prevents post-tonsillectomy nausea and vomiting

background: post-operative nausea and vomiting (ponv) following surgical operations requiring general anesthesia are common and distressing. the incidence of ponv may be as high as 70% during the first 24 hrs of tonsillectomy.   objective: this study determines the effects of intraoperative well-hydration on postoperative nausea and vomiting.   methods: 90 asa i patients with age of 6-12 years  scheduled for tonsillectomy under general anesthesia randomly assigned to receive either routine iv fluid plus intraoperative well-hydration plus 4 ml/kg/h ringer ’ s solution (well hydrated group; n=45) and routine iv fluid requirements (control group; n=45). all study preparations were administered in a double-blinded fashion.   results: during the first postoperative day, the incidence of nausea and vomiting were significantly lower in the well-hydrated group as compared with control (p<0.05). there was no significant differences between males and females regarding the incidence of nausea and vomiting (p>0.05).   conclusion: the present study showed that well-hydration reduces the incidence of post tonsillectomy nausea and vomiting, and high iv fluid therapy is a simple, effective, safe and well-tolerated technique for prevention of postoperative nausea and vomiting.