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Supraclavicular brachial plexus block (SCBPB) is a traditional anesthesia technique widely used in upper limb surgery. Ultrasound-guided SCBPB shows the peripheral structure and dynamic local anesthetic diffusion and can greatly shorten the anesthesia operation time, increase the success rate of anesthesia, and reduce the incidence of complications. However, it can still block the phrenic nerve and paralyze the diaphragm, which can be difficult to avoid. This study investigated two different volumes of the same concentration of ropivacaine used in ultrasound-guided SCBPB, and compared the effects on the incidence of diaphragmatic paralysis, pulse oxygen saturation (SpO2) and lung function in patients.

Effect of different volumes of 0.375% ropivacaine on diaphragmatic paralysis by supraclavicular brachial plexus block under ultrasound guidance