Horner's syndrome is not a complication of a brachial plexus block.
Avidan
Alexander
A
D001917:Brachial Plexus; D002404:Catheterization / Q000295:instrumentation; D004599:Electric Stimulation Therapy / Q000295:instrumentation; D006732:Horner Syndrome / Q000209:etiology*; D006801:Humans; D009407:Nerve Block / Q000009:adverse effects* / Q000379:methods