title: Apnea and syncope following intravenous guanethidine Bier block in the same patient on two different occasions.
mesh_terms: D000328:Adult; D000765:Anesthesia, Conduction / Q000009:adverse effects*; D001049:Apnea / Q000209:etiology*; D001340:Autonomic Nerve Block / Q000009:adverse effects; D005260:Female; D006145:Guanethidine / Q000009:adverse effects*; D006801:Humans; D013575:Syncope / Q000209:etiology*
chemical_list: D006145:Guanethidine