Potassium Channel BlockersAction PotentialsPotassium ChannelsPotassium4-AminopyridinePotassium Channels, Voltage-GatedTetraethylammoniumCalcium Channel BlockersPotassium Channels, Inwardly RectifyingMembrane PotentialsElectrophysiologyPatch-Clamp TechniquesAnti-Arrhythmia AgentsGuinea PigsIon ChannelsGlyburideTetraethylammonium CompoundsVentricular FunctionHeart Conduction SystemHeartHeart VentriclesEther-A-Go-Go Potassium ChannelsCalciumCalcium ChannelsDelayed Rectifier Potassium ChannelsIon Channel GatingPapillary MusclesArrhythmias, CardiacAminopyridinesPurkinje FibersSodium Channel BlockersCalcium Channels, L-TypeShaker Superfamily of Potassium ChannelsApaminMyocytes, CardiacRefractory Period, ElectrophysiologicalKCNQ1 Potassium ChannelElectric StimulationKv1.3 Potassium ChannelDose-Response Relationship, DrugDogsCharybdotoxinKCNQ Potassium ChannelsKv1.5 Potassium ChannelHeart AtriaCromakalimShal Potassium ChannelsPhenethylaminesMyocardiumModels, CardiovascularPotassium Channels, Calcium-ActivatedTime FactorsScorpion VenomsElectric ConductivityKATP ChannelsKv1.2 Potassium ChannelLong QT SyndromeKv1.1 Potassium ChannelRats, Sprague-DawleyKv1.4 Potassium ChannelVentricular FibrillationEndocardiumMyocardial ContractionShaw Potassium ChannelsShab Potassium ChannelsNeuronsSodium ChannelsPericardiumSotalolElectrocardiographyTetrodotoxinCardiac Pacing, ArtificialPotassium Channels, Tandem Pore DomainAtrial FunctionRabbitsSodiumLarge-Conductance Calcium-Activated Potassium ChannelsChloride ChannelsCells, CulturedVoltage-Sensitive Dye ImagingPiperidinesRats, WistarQuinidineMicroelectrodesPinacidilBarium CompoundsVerapamilKCNQ2 Potassium ChannelNifedipineTorsades de PointesNicorandilSmall-Conductance Calcium-Activated Potassium ChannelsVasodilator AgentsMexiletineKCNQ3 Potassium ChannelBariumCnidarian VenomsElectrophysiological PhenomenaBepridilElectrophysiologic Techniques, Cardiac