The purpose of this study is to quickly evaluate the degree of phrenic nerve block by observing the changes of diaphragm movement through ultrasound, and to find the best scheme for clinical application by controlling the concentration of narcotic drugs, so as to reduce respiratory related complications.
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the maximum range of motion of bilateral diaphragm
Timeframe: The ultrasound examination of bilateral diaphragms was carried out before brachial plexus block on the affected side, and the ultrasound examination of diaphragm on the blocked side was carried out again 10 minutes after local anesthetic
the change rate of diaphragm thickness
Timeframe: The ultrasound examination of bilateral diaphragms was carried out before brachial plexus block on the affected side, and the ultrasound examination of diaphragm on the blocked side was carried out again 10 minutes after local anesthetic injection