1,230
Participants
Start Date
October 9, 2017
Primary Completion Date
June 13, 2019
Study Completion Date
August 13, 2019
Tramadol
Patient-controlled intravenous analgesia with Tramadol
Hydromorphone
Patient-controlled intravenous analgesia with Hydromorphone
Ropivacaine (Epidural analgesia)
Patient-controlled epidural analgesia with Ropivacaine.
Xinqiao Hospital, Third Military Medical University, Chongqing
Xinqiao Hospital of Chongqing
OTHER