Heart AtriaAtrial FunctionAtrial FibrillationAtrial Function, RightPulmonary VeinsHeartHeart Conduction SystemHeart NeoplasmsMyocardial ContractionElectrophysiologic Techniques, CardiacCatheter AblationSinoatrial NodeDogsVena Cava, SuperiorCardiac Pacing, ArtificialAtrial Function, LeftRefractory Period, ElectrophysiologicalGuinea PigsAtrial FlutterHeart VentriclesAtrioventricular NodeAtrial AppendageElectrocardiographyHeart RateBody Surface Potential MappingEchocardiography, TransesophagealMyxomaIsoproterenolTachycardia, Ectopic AtrialAtrial Natriuretic FactorAtrial SeptumAction PotentialsEchocardiographyTyramineVena Cava, InferiorFistulaAnti-Arrhythmia AgentsBundle of HisAutonomic DenervationTachycardiaCoronary SinusEndocardiumPericardiumElectric StimulationMitral Valve StenosisHeart Septal Defects, AtrialVagus NerveHeart SeptumHeart BlockElectrophysiologyMitral ValveReserpinePacemaker, ArtificialPropranololStimulation, ChemicalAtrial Premature ComplexesCardiac Surgical ProceduresVentricular FunctionAtropineReceptors, MuscarinicCardiac CatheterizationCor TriatriatumTricuspid ValveModels, CardiovascularDepression, ChemicalReceptors, Serotonin, 5-HT4Cardiotonic AgentsFetal HeartArrhythmias, CardiacHeart DiseasesParasympatholyticsMyocytes, CardiacHeart InjuriesElectric CountershockBurimamideCarbacholSinus of ValsalvaTachycardia, ParoxysmalTreatment OutcomeHeart Defects, CongenitalHeart AneurysmSympathetic Nervous SystemAcetylcholineAdrenergic beta-AgonistsTachycardia, Atrioventricular Nodal ReentryRabbitsMitral Valve InsufficiencyParasympathetic Nervous SystemTachycardia, SupraventricularVenae CavaeAdrenergic beta-AntagonistsCardiomegalyVascular FistulaReceptors, Adrenergic, betaHeart Valve DiseasesPerfusionPapillary MusclesPulmonary ArteryReceptors, AdrenergicDibenzoxazepines