头高位对0.5％布比卡因蛛网膜下腔阻滞平面的影响

INFLUENCE OF HEAD-UP POSITION ON THE ANESTHETIC LEVEL WITH 0.5% BUPIVACAINE SPINAL BLOCK

40例行0.5％布比卡因蛛网膜下腔阻滞,分成四组,Ⅰ组手术床置水平位。Ⅱ～Ⅳ组置头高25°;注药后分别于0、2.5、5、7.5min转水平仰卧位。Ⅳ组镇痛平面较Ⅰ、Ⅱ组为高,在5min时有统计学意义。麻醉平面在5min以后才显示出差异,30min时最明显,Ⅳ组较Ⅰ、Ⅱ组分别高4和2.7个节段,与Ⅲ组几乎相等。本研究结果提示0.5％布比卡因溶液在体温下属相对轻比重溶液,注药时取头高位可使麻醉平面升高,而且头高位时间5min已经足够。

40 patients were anesthefized with 0.5% plain Bupivacaine for spinal block.All patients were placed in lateral position. The first group was in horizental and other 3 groups were in head-up 25°. They were turned to horizental-supine position 2.5, 5, 7.5 min after injection respectively. we found analgesic level of group 4 was higher than group 1 and 2. The anesthetic level of group 4 was about 4 and 2.7 segments higher than group 1 and 2. 30 min later, the anesthetic level of group 3 and 4 were almost same. It suggested 0.5% plain Bupivacaine is slight hypobaric at body temperature. for the fixation of anesthetic level. The head-up position for 5 min is enough.