Objective To investigate the effects of volume expansion before induction of anaesthesia on postoperative nausea and vomiting(PONV) in patients undergoing laparoscopic operations.
目的研究麻醉诱导前扩容对腹腔镜手术后恶心呕吐（PONV）发生率的影响。
The mechanism of postoperative nausea and vomiting(PONV)is not clear. Pharmacotherapy is not good enough for PONV, and acupuncture has some effect on PONV though mechanism was not clear also.
术后恶心呕吐的发病机制不明，药物治疗效果欠佳，非药物治疗如针灸治疗有一定的疗效，但其作用机制尚不明确。
Objective: to systematically evaluate the efficacy of tropisetron for postoperative nausea and vomiting (PONV).
目的：系统评价托烷司琼预防全麻术后恶心呕吐(PONV)的有效性。
Objective: to systematically evaluate the efficacy of tropisetron for postoperative nausea and vomiting (PONV).
目的：系统评价托烷司琼预防全麻术后恶心呕吐(PONV)的有效性。
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