Pure Autonomic FailureSympathectomy3-IodobenzylguanidineGanglionectomyDenervationAutonomic Nervous System DiseasesSympathetic Nervous SystemIodobenzenesHeartMuscle DenervationAutonomic DenervationTachycardia, VentricularIodine RadioisotopesSympathectomy, ChemicalNorepinephrineStellate GanglionEphedrineShy-Drager SyndromeMyocytes, CardiacAdrenergic FibersSympatholyticsCatecholaminesAtrial RemodelingLocus CoeruleusBlood PressureAdrenergic NeuronsCardiac OutputHyperhidrosisRenal ArteryOxidopamineHeart RateTyramineKidneyTime FactorsArrhythmias, CardiacRats, Sprague-DawleyHypertensionDogsCardiac Surgical ProceduresMyocardiumParasympathetic Nervous System