Bilateral spread of analgesia following interscalene brachial plexus block.
D001132:Arm / Q000601:surgery*; D001917:Brachial Plexus; D005260:Female; D006801:Humans; D008875:Middle Aged; D009334:Neck Muscles; D009407:Nerve Block / Q000009:adverse effects* / Q000379:methods