A . 与平时硬膜外阻滞相同
B . 采取患侧在下的45°半仰卧位,注射酚甘油时要缓慢推注(30~60s/0.1ml)0.5ml,注药后保持体位30min
C . 采取患侧在上的45°半仰卧位,注射酚甘油时要缓慢推注(30~60s/0.1ml)0.5ml,注药后保持体位30min
D . 采取患侧在下的45°半仰卧位,注射酚甘油时要缓慢推注(30~60s/0.1ml)0.5ml,注药完毕后即可平卧
E . 采取患侧在上的45°半仰卧位,即刻注射酚甘油0.5ml,注药后保持体位30min
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