To determine the median effective concentration of ropivacaine hydrochloride for ultrasound-guided supraclavicular brachial plexus block. The result can provide reference for choosing appropriate drug concentration in clinical anesthesia.
Study Type
INTERVENTIONAL
Allocation
NA
Masking
SINGLE
Enrollment
60
Department of Anesthesiology,Sixth People's Hospital
Shanghai, Shanghai Municipality, China
RECRUITINGthe affection of nerve block
The anesthetic efficacy of five nerves, respectively named lateral antebrachial cutaneous nerve, medial cutaneous nerve of the forearm, radial nerve, median nerve, and ulnar nerve was assessed within 30 min after anesthesia. The next concentration of ropivacaine was adjusted according to the response of the previous patient using up-down sequential allocation.
Time frame: 30 minutes
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