Effects of ultrasound-guided lateral quadratus lumborum block on ED50 of butorphanol by patient controlled intravenous analgesia after cesarean section under general anesthesia
a.Department of Anesthesiology, Longgang District People’s Hospital of Shenzhen / the Second Affiliated Hospital, Chinese University of Hong Kong, Shenzhen GUANGDONG 518172, China,
b.Department of Gynaecology, Longgang District People’s Hospital of Shenzhen / the Second Affiliated Hospital, Chinese University of Hong Kong, Shenzhen GUANGDONG 518172, China
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