Bretylium CompoundsBretylium TosylateGuanethidineSympatholyticsTyramineAmidinesPharmacologyReserpinePempidinePentolinium TartrateHexamethonium CompoundsNorepinephrineNialamideSympathomimeticsCordotomyAutonomic Nerve BlockPhentolaminePhenoxybenzamineGanglionic BlockersCyclopentolateAdrenergic AgentsSympathetic Nervous SystemAtropineAdrenergic AntagonistsVas DeferensSkin TemperaturePropranololProcaineInjections, Intra-ArterialGuinea PigsRubidium Radioisotopes