在硬膜外麻醉下行胃癌根治术 ,术中常见恶心呕吐。传统做法是在腹膜切开探查腹膜以前静注半量至全量哌异合剂[1] 或芬氟合剂等辅助药物 ,使患者入睡 ,不感牵引内脏之不适。但其效果并不很理想。笔者预防性使用恩丹西酮收到了满意的效果。资料与方法一般资料　 6 9例ＡＳＡⅠ～ Under epidural anesthesia underwent radical gastrectomy, nausea and vomiting common. Traditional practice is to semi-peritoneal exploration of the peritoneum before the intravenous injection of semi-total amount of piperazepam [1] or Fen fluoride mixture and other auxiliary drugs, so that patients fall asleep, do not feel distracted visceral discomfort. But its effect is not very satisfactory. The author of ondansetron preventive use received satisfactory results. Materials and Methods General Information 69 cases of ASA Ⅰ ~