Interscalene brachial plexus blocks in the management of shoulder dislocations.

Interscalene brachial plexus block is a simple and effective alternative to intravenous benzodiazepines or general anaesthesia for manipulation of the dislocated shoulder. Thirty interscalene brachial plexus blocks were performed on 29 patients with dislocations of the shoulder to provide regional anaesthesia for reduction. Pain was abolished by 14 out of the 30 blocks performed, improved by 13 and unchanged by three. Muscle relaxation (MRC grade 3 or less) occurred in 21 patients. In 26 cases the block allowed reduction of the dislocation without additional analgesia or sedative. Reduction was not possible in four cases. There were no significant complications.