Evaluation of block effects
nerve trunk innervation, pain
The sensorimotor block was scored every 5 min within 30 min after the block by the same nursing staff who were unaware of the block method. The sensory block was evaluated in the C5 ~ T1 nerve trunk innervation area by a needle-punching method with the following score: 0 = normal pricking sensation, 1 = tactile presence and loss of pain, and 2 = tactile absence, and 1 and 2 points were recorded as a perfect block. The test points were as followed: inferior along the edge of the deltoid muscle (C5), the forearm to the radial side (C6), 2rd to 3rd interphalangeal of dorsal hand (C7), 4rd to 5rd interphalangeal of dorsal hand (C8), the inner forearm (T1). Motor block was evaluated by the operated arm lift and hand grip strength. The grading standards was followed: 0 = no motor block, 1 = feeling heavy, and 2 = unable to lift the limb or shake hands. 1 and 2 points were both recorded as a perfect block [