Objective To evaluate the different prophylactic effects of azasetron in defferent infusion modes on postoperative nausea and vomiting(PONV) during patient controlled intravenous analgesia(PCIA).

• 目的探讨阿扎司琼不同给药方式对术后静脉自控镇痛恶心呕吐(PONV)的预防效果。