碳酸酐酶抑制剂乙酰唑胺对切口痛大鼠痛行为的影响

摘要

Aim To observe the effect of carbonic anhydrase inhibitor acetazolamide ( ACT ) on the behavior of rats with incision pain. Methods All rats were intrathecally cathetered, six days later they were randomly divided into 5 groups with 16 rats in each group:sham, sham + ACT, incision pain, incision pain + low dose of ACT( 2.25 μg ), incision pain + high dose of ACT( 22.5 μg ). Rat' s incision pain model was established by using Brennan's method. ACT or vehicle was administered intrathecally 24 h after operation. Thermal withdrawal latency( TWL ) and mechanical withdrawal threshold( MWT ) were measured and compared 1 d before operation( baseline )and l d after operation( before drug injection and 30,75,120,165,240 min after drug injection ). Results The TWL and MWT were decreased significantly on 1 d after incision compared with baseline( P ＜ 0.05 ). Intrathecal administration of highdose ACT increased the TWL at 30, 75 and 120 min after drug injection( P ＜ 0.05 ). However, high dose ACT had no effect on the MWT. The TWL in incision + HACT group was significantly higher than that in incision group at 30, 75 and 120 min after drug injection ( P ＜ 0.05 ). Conclusions ACT at large dose can partially alleviate incision-induced heat hyperalgesia but has no effect on the mechanical hyperalgesia. Carbonic anhydrase might be involved in the development of heat hyperalgesia induced by incision.%目的 观察鞘内注射碳酸酐酶抑制剂乙酰唑胺(ACT)对大鼠切口痛行为的影响.方法 所有大鼠术前6天鞘内置管,随机分为5组:假手术组、假手术+ACT组、切口痛组、切口痛+ACT低剂量(2.25 μg)组、切口痛+ACT高剂量(22.5 μg)组,每组16只.按照Brennan法建立切口痛模型.ACT和生理盐水均在术后d 1鞘内给予.分别于术前d 1(基础值)、术后d 1(给药前,给药后30、75、120、165、240 min)测定大鼠的热缩足潜伏期(TWL)和机械缩足反射阈值(MWT),并予比较.结果 切口痛术后d 1(给药前)与基础值相比TWL、MWT均明显降低(P<0.05);鞘内给予高剂量ACT,与给药前相比,给药后30、75、120 min TWL升高(P<0.05),但不影响大鼠的MWT;与切口痛组相比,切口痛+ACT高剂量组在给药后30、75、120 min TWL明显增高(P<0.05).结论 鞘内给予碳酸酐酶抑制剂ACT部分缓解了切口痛大鼠的热痛觉过敏,但是对机械痛觉过敏没有影响,提示碳酸酐酶可能参与了切口痛的热痛敏过程.