Action PotentialsRefractory Period, ElectrophysiologicalHeart Conduction SystemVentricular FunctionAnti-Arrhythmia AgentsSotalolArrhythmias, CardiacTorsades de PointesEndocardiumHeartElectrocardiographyCardiac Pacing, ArtificialHeart VentriclesDogsHeart AtriaVentricular FibrillationPericardiumElectrophysiologyLong QT SyndromeGuinea PigsElectrophysiologic Techniques, CardiacAtrial FunctionProcainamidePotassium ChannelsTachycardia, VentricularMyocytes, CardiacDelayed Rectifier Potassium ChannelsModels, CardiovascularQuinidinePotassium Channel BlockersPapillary MusclesNicorandilRabbitsPurkinje FibersAtrial FibrillationMyocardial ContractionElectric StimulationTime FactorsMyocardiumSodium ChannelsCisaprideTachycardia, SinusPotassiumPatch-Clamp TechniquesHeart RateMembrane PotentialsFlecainideHeart BlockPerfusionElectric CountershockNAV1.5 Voltage-Gated Sodium ChannelHypokalemiaAmiodaronePotassium Channels, Voltage-GatedCalcium Channels, L-TypeVoltage-Sensitive Dye ImagingBenzylisoquinolinesCalciumSulfonamides4-AminopyridineAtrioventricular NodeDose-Response Relationship, DrugMicroelectrodesEther-A-Go-Go Potassium ChannelsTetrodotoxinDisease Models, AnimalElectric ConductivityLidocaineAcetanilidesBepridilMexiletineSodium Channel BlockersMyocardial IschemiaElectrophysiological PhenomenaComputer SimulationSodiumShal Potassium ChannelsIsoproterenolCnidarian VenomsPhenethylaminesCardiac Complexes, PrematureIon ChannelsSinoatrial NodeCalcium Channel BlockersKCNQ1 Potassium ChannelTachycardiaBlood PressureTetraethylammonium CompoundsReaction TimeCalcium SignalingNeural ConductionCalcium ChannelsNeuronsIon Channel GatingPiperidinesMuscle CellsSodium-Calcium ExchangerPotassium Channels, Inwardly RectifyingMyocardial InfarctionBarium Compounds