Sympathectomy3-IodobenzylguanidineGanglionectomyAutonomic Nervous System DiseasesSympathetic Nervous SystemIodobenzenesDenervationHeartTachycardia, VentricularIodine RadioisotopesMuscle DenervationAutonomic DenervationSympathectomy, ChemicalStellate GanglionEphedrineMyocytes, CardiacShy-Drager SyndromeSympatholyticsAtrial RemodelingCardiac OutputNorepinephrineAdrenergic FibersCatecholaminesBlood PressureHyperhidrosisRenal ArteryHeart RateArrhythmias, CardiacCardiac Surgical ProceduresTyramineMyocardiumDeath, Sudden, CardiacKidneyHypertensionCatheter AblationTime FactorsDogsOxidopamineRadiopharmaceuticalsParasympathetic Nervous SystemHemodynamicsLong QT SyndromeAutonomic Nervous SystemRegional Blood FlowRats, Sprague-DawleyCardiac Pacing, ArtificialCardiomegalyThallium RadioisotopesCardiac TamponadeRats, Inbred StrainsCerebral ArteriesHeart DiseasesParkinson DiseaseTreatment OutcomeCardiac CatheterizationMyocardial ContractionHeart VentriclesHeart ArrestCarbon Radioisotopes