SBP and DBF in group L were lower than group H at 3, 5min after anesthesia, the end of the operation and 3,5, 10min respectively, but HR was higher at 5min.

• 最低SBP和DBPH组均高于L组； 最高HR、麻黄素平均需要量及低血压发生率H组低于L组。