title: Letter: Intravenous regional sympathetic block with guanethidine.
mesh_terms: D001808:Blood Vessels / Q000187:drug effects; D005528:Foot / Q000098:blood supply / Q000294:innervation; D006145:Guanethidine / Q000008:administration & dosage* / Q000494:pharmacology; D006801:Humans; D007275:Injections, Intravenous; D007511:Ischemia / Q000517:prevention & control; D009407:Nerve Block
chemical_list: D006145:Guanethidine