4Koivuranta M,Laara E,Snare L,et al.A survey of postoperative nausea and vomiting[J].Anaesthesia,1997,52:443.
5Shende D,Das K.Comparative effects of intavenous ketorolac and pethidine on perioperative[J].Anaesthesiol Scand,1999,43(3):265.
6Clevers GJ,Smout AJPM,Schee VD,et al.Change in electrical activity in patients with several postoperative nausea and vomiting[J].Journal of Gastrointestinal Motility,1992,4:61.