Heart Conduction SystemHeartHeart RateHeart Defects, CongenitalFetal HeartNeural ConductionExercise TestMyocardiumAtrioventricular NodeHeart BlockHeart FailureHeart AtriaHeart DiseasesHeart TransplantationAction PotentialsCardiac Pacing, ArtificialBone ConductionElectrocardiographyMedian NerveRefractory Period, ElectrophysiologicalArrhythmias, CardiacHeart ValvesElectrophysiologic Techniques, CardiacUlnar NerveDogsPeripheral NervesAtrioventricular BlockSinoatrial NodeTime FactorsElectrophysiologyMyocytes, CardiacPurkinje FibersTibial NerveMyocardial ContractionAphasia, ConductionAtrial FlutterElectrodiagnosisModels, CardiovascularAxonsCatheter AblationElectric StimulationAtrial FunctionSural NerveAtrial FibrillationAnti-Arrhythmia AgentsWolff-Parkinson-White SyndromeConnexin 43Peripheral Nervous System DiseasesNAV1.5 Voltage-Gated Sodium ChannelTachycardiaDiabetic NeuropathiesMotor NeuronsHeart Function TestsSciatic NerveSodium ChannelsPeroneal NerveTachycardia, Atrioventricular Nodal ReentryMyocardial IschemiaHeart SeptumRanvier's NodesHeart Arrest, InducedCarpal Tunnel SyndromeEndocardiumConnexinsBody Surface Potential MappingCardiomyopathy, DilatedBundle-Branch BlockHemodynamicsElectromyographyHeart VentriclesTachycardia, SupraventricularCardiomyopathiesVentricular Function, LeftGap JunctionsPerfusionNerve Fibers, MyelinatedCoronary DiseasePolyneuropathiesElectric ConductivityNerve FibersNeurons, AfferentEchocardiographyRabbitsMyocardial InfarctionTachycardia, ParoxysmalTachycardia, VentricularVoltage-Sensitive Dye ImagingCardiomegalyDisease Models, AnimalRats, Sprague-DawleyEvoked Potentials, SomatosensoryLidocaineFollow-Up StudiesMyelin SheathCardiac Complexes, PrematureCardiac Output, LowVagus NerveCardiac ElectrophysiologyVentricular FibrillationFlecainide