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Ultrasonographic study of the spread of local anaesthetic during axillary brachial plexus block.

Ultrasonography has been used to demonstrate the anatomy of the axilla, to confirm the placement of a cannula and to visualize the spread of a local anaesthetic solution in the axillary sheath of 10 patients (aged 17-70 yr) for surgery of the forearm and hand. The block was successful in all subjects.