126
Participants
Start Date
December 1, 2017
Primary Completion Date
December 20, 2018
Study Completion Date
December 31, 2018
Butorphanol
intravenous loading dose of 15ug/kg butorphanol,and followed by infusion of 7.5ug/kg/h butorphanol and stopped infusion until the Ramsay sedation score reached 4 points
physiological saline
intravenous infusion of the same volume of physiological saline
shengjing hospital of China medical university, Shenyang
Shengjing Hospital
OTHER