Sympathectomy3-IodobenzylguanidineGanglionectomyAutonomic Nervous System DiseasesSympathetic Nervous SystemIodobenzenesDenervationHeartTachycardia, VentricularIodine RadioisotopesMuscle DenervationAutonomic DenervationSympathectomy, ChemicalStellate GanglionEphedrineShy-Drager SyndromeSympatholyticsAtrial RemodelingAdrenergic FibersNorepinephrineHyperhidrosisCatecholaminesRenal ArteryBlood PressureMyocytes, CardiacTyramineKidneyCatheter AblationHeart RateOxidopamineHypertensionRadiopharmaceuticalsParasympathetic Nervous SystemCardiac OutputDogsMyocardiumLong QT SyndromeAutonomic Nervous SystemTime FactorsCerebral ArteriesRegional Blood FlowThallium RadioisotopesRats, Inbred StrainsHemodynamicsParkinson DiseaseArrhythmias, CardiacRats, Sprague-DawleyCardiac Surgical ProceduresCarbon Radioisotopes