72
Participants
Start Date
May 10, 2019
Primary Completion Date
August 28, 2019
Study Completion Date
September 2, 2019
single-injection QLB(quadratus lumborum block)
"Inject 0.4ml/kg 0.5% ropivacaine between quadratus lumborum and psoas major muscle~Device: The curved (C1-5) probe of Ultrasound Scanner Philips CX50 is used for scan~Drug: single dose ropivacaine 0.4ml/kg 0.5% ropivacaine is given immediately after the correct position of needle tip is verified."
Placebo Control
"Inject 0.4ml/kg saline between quadratus lumborum and psoas major muscle~Device: The curved (C1-5) probe of Ultrasound Scanner Philips CX50 is used for scan~Drug: single dose 0.4ml/kg 0.9% NS is given immediately after the correct position of the needle tip is verified"
Peking Union Medical College Hospital, Beijing
Peking Union Medical College Hospital
OTHER