In these two studies by the same japanese group ( 7 , 8 ) , the enhanced pressor effects of ephedrine and phenylephrine following an alpha 2 agonist ( clonidine ) were no different between awake and anesthetized ( enflurane and nitrous oxide in oxygen ) patients 在这两个研究中[ 7 ， 8 ] ，麻黄素和苯肾上腺素在使用- 2受体激动剂（可乐定）后的升压效果增强在清醒和麻醉（安氟醚和笑气）病人没有差别。
