Sympathectomy3-IodobenzylguanidineGanglionectomyAutonomic Nervous System DiseasesHeartSympathetic Nervous SystemIodobenzenesDenervationHeart VentriclesTachycardia, VentricularIodine RadioisotopesMuscle DenervationMyocardiumVentricular FunctionMyocytes, CardiacAutonomic DenervationSympathectomy, ChemicalStellate GanglionMyocardial ContractionEphedrineShy-Drager SyndromeSympatholyticsAtrial RemodelingCalciumCells, CulturedAdrenergic FibersNorepinephrineCatecholaminesHyperhidrosisRenal ArteryBlood PressureTyramineHeart RateKidneyHypertensionCatheter AblationOxidopamineRadiopharmaceuticalsDogsCardiac OutputParasympathetic Nervous SystemTime FactorsVentricular Function, LeftHemodynamicsAutonomic Nervous SystemLong QT SyndromeRegional Blood FlowCerebral ArteriesThallium RadioisotopesRats, Inbred StrainsParkinson DiseaseVentricular Dysfunction, LeftArrhythmias, CardiacRats, Sprague-DawleyCardiac Surgical ProceduresTreatment OutcomeCarbon Radioisotopes