Sinoatrial NodeHeart Conduction SystemSinoatrial BlockAtrioventricular NodeHeartNeural ConductionBundle of HisHeart BlockHeart RateHeart AtriaTachycardia, Sinoatrial Nodal ReentryPurkinje FibersLymph NodesConnexinsBiological ClocksBradycardiaAction PotentialsElectrocardiographyRabbitsModels, CardiovascularArrhythmias, CardiacAtrial FunctionHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsElectrophysiologyMyocardiumConnexin 43Myocytes, CardiacHeart VentriclesT-Box Domain ProteinsCardiac Pacing, ArtificialArrhythmia, SinusAtrioventricular BlockDogsVagus NerveSick Sinus SyndromeAnti-Arrhythmia AgentsCyclic Nucleotide-Gated Cation ChannelsAtrial Function, RightVentricular FunctionHeterotaxy SyndromeSodium ChannelsMyocardial ContractionMembrane PotentialsPacemaker, ArtificialGene Expression Regulation, DevelopmentalLac OperonRefractory Period, ElectrophysiologicalCalcium Channels, L-TypePotassium ChannelsHeart DiseasesWolff-Parkinson-White SyndromeSp4 Transcription FactorIsoproterenolHeart Defects, CongenitalIon ChannelsTime FactorsCalcium Channels, T-TypeHeart FailureElectrophysiologic Techniques, CardiacCardiac ElectrophysiologyAcetylthiocholineTachycardia, SinusTachycardiaNAV1.5 Voltage-Gated Sodium ChannelMice, TransgenicPatch-Clamp TechniquesElectrophysiological PhenomenaGuinea PigsMicroelectrodesTachycardia, SupraventricularGATA6 Transcription FactorCardiotonic AgentsMyoblasts, CardiacMice, KnockoutAdrenergic beta-AgonistsLymph Node ExcisionAminophyllineAutonomic Nervous SystemDextrocardiaImmunohistochemistryThiolester HydrolasesBundle-Branch BlockComputer SimulationDelayed Rectifier Potassium ChannelsCnidariaBenzazepinesCatheter AblationTachycardia, Atrioventricular Nodal ReentryHeart SeptumElectric StimulationAntigens, CD57Atrial FibrillationCalciumHeart TransplantationCardiac MyosinsLamin Type ACardiomyopathiesHeart ValvesParasympathetic Nervous SystemAcetylcholine