研究单位：[1]Huazhong University of Science and Technology[2]Department of Anesthesiology,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology Wuhan,Hubei,China,430030
研究目的：
The aim of this study is to determine the minimum effective concentration of local anesthetic (ropivacaine 40mL) required to produce an effective double-injection USG-SCB for surgical anesthesia in 90% of patients (MEC90) in young group (18-40 years) and in middle aged group (40-65 years) of patients scheduled for elective surgery of one upper limb distal to the shoulder.
