155
Participants
Start Date
March 5, 2018
Primary Completion Date
February 20, 2019
Study Completion Date
March 5, 2019
Butorphanol
intravenous loading dose of 15ug/kg butorphanol 5 mins before starting the surgery, then followed by infusion of 7.5ug/kg/h butorphanol and stopped infusion when the Ramsay sedation score (RSS) reached 4
Physiological saline
intravenous infusion of the same volume of 0.9% saline
shengjing hospital of China medical university, Shenyang
Shengjing Hospital
OTHER