TachycardiaHypotensionTachycardia, VentricularTachycardia, SupraventricularHypertensionHypotension, ControlledTachycardia, Atrioventricular Nodal ReentryHypertension, PulmonaryTachycardia, ParoxysmalTachycardia, Ectopic AtrialHypotension, OrthostaticTachycardia, SinusBlood PressureElectrocardiographyCatheter AblationIntracranial HypotensionTachycardia, Ectopic JunctionalPostural Orthostatic Tachycardia SyndromeHypertension, RenalHeart RateHypertension, PortalTachycardia, ReciprocatingTachycardia, Sinoatrial Nodal ReentryAntihypertensive AgentsHeart Conduction SystemElectrophysiologic Techniques, CardiacCardiac Pacing, ArtificialAnti-Arrhythmia AgentsHypertension, RenovascularAtrioventricular NodeHemodynamicsHypertension, MalignantBundle of HisArrhythmias, CardiacBody Surface Potential MappingVentricular FibrillationWolff-Parkinson-White SyndromeTreatment OutcomeBradycardiaFollow-Up StudiesTime FactorsRisk FactorsSyncopeVascular ResistanceHeart VentriclesDefibrillators, ImplantableAmiodaroneElectrocardiography, AmbulatoryHypertension, Pregnancy-InducedProspective StudiesHeart AtriaVentricular Premature ComplexesSympathetic Nervous SystemDogsFlecainideReninRetrospective StudiesRats, Inbred SHRCryosurgeryPulmonary ArteryProcainamideEndocardiumAdrenergic beta-AntagonistsAtrial FlutterHeart BlockOcular HypertensionPost-Exercise HypotensionBundle-Branch BlockAutonomic Nervous System DiseasesTrimethaphanPre-Excitation SyndromesBlood Pressure DeterminationKidneyAccessory Atrioventricular BundleElectrophysiologyCardiac Complexes, PrematureRats, Inbred WKYDisease Models, AnimalDeath, Sudden, CardiacEchocardiographyIntracranial HypertensionElectric CountershockTilt-Table TestPregnancy Complications, CardiovascularNorepinephrineCardiac OutputHeartRats, Sprague-DawleyVasodilator AgentsCardiovascular SystemAtrial FibrillationPosturePropranololRecurrenceEpicardial MappingAngiotensin IIPrevalenceAnesthesiaAutonomic Nervous SystemNitroprusside