There are studies in adults with inconclusive results related to supplemental fluid therapy and decrease of postoperative nausea and vomiting. But, in recent years a study in children showed favorable results in strabismus surgery. The foundation of this study consist in that hypovolemia may possibly cause a decrease in perfusion causing intestinal hypoxia, which in turn increase the incidence of nausea and vomiting. The objective of this study is to observe the effect of supplemental fluid therapy on postoperative vomiting on otorhinolaryngological surgery.