该研究旨在明确在经阴道子宫切除术之前预先给予长效局部麻醉药能否改善术后疼痛。　　作者采用随机、双盲、安慰剂对照的临床试验设计。同意参与本研究的患者随机接受加 1∶2 0 0 0 0 0肾上腺素的 0 .5 %布比卡因2 0ml或加 1∶2 0 0 0 0 0肾上腺素的生理盐水 2 0ml宫颈阴道结 The aim of this study was to determine if premedication of long-acting local anesthetics before vaginal hysterectomy can improve postoperative pain. The authors used a randomized, double-blind, placebo-controlled clinical trial design. Patients enrolled in this study were given a randomized trial of 0.5% bupivacaine plus 2 0 ml or 1 plus 2 0 0 0 0 0 adrenaline plus 1: 2 0 0 0 0 0 epinephrine 2 0 ml cervical vaginal junction