The patients in the Pethidine Hydrochloride group were intramuscular injected with 50 mg Pethidine Hydrochloride with 4 hours or above intervals;

• 盐酸哌替啶肌注镇痛组患者在术后疼痛并要求镇痛时肌注盐酸哌替啶50mg,每次间隔4h以上;