PotassiumSodiumExtracellular SpaceStrophanthidinOuabainPurkinje FibersMembrane PotentialsSodium-Potassium-Exchanging ATPasePotassium ChannelsSodium IsotopesDysprosiumAction PotentialsCardiac GlycosidesBiological Transport, ActiveRubidiumMicroelectrodesSodium ChannelsCalciumHeart Conduction SystemTetrodotoxinLithiumIon ChannelsPotassium Channel BlockersElectrophysiologyPotassium Channels, Inwardly RectifyingVeratrinePhotometryGuinea PigsElectric StimulationCortical Spreading DepressionHypokalemic Periodic ParalysisPotassium ChlorideMyocardial ContractionPotassium Channels, Voltage-GatedPapillary MusclesVeratridineMyocardiumCesiumBarium CompoundsPatch-Clamp TechniquesNeuronsIntracellular FluidMonensinAmilorideCell Membrane PermeabilityPerfusionTime FactorsHydrogen-Ion ConcentrationTetraethylammonium CompoundsBufo bufoOpossumsHeartOsmolar ConcentrationKineticsQuinidineSodium-Hydrogen AntiporterElectric ConductivitySodium Channel BlockersTetraethylammoniumSodium ChlorideBiological TransportExtracellular FluidPotassium, DietaryKCNQ1 Potassium ChannelSheepDogsRats, WistarAnuraBepridilPotassium DeficiencyRats, Inbred StrainsCells, CulturedRats, Sprague-DawleyBenzofuransSodium-Calcium ExchangerChloridesMagnetic Resonance Spectroscopy4-AminopyridinePotassium CompoundsHeart VentriclesAcetanilidesCardiac Complexes, PrematureIon TransportNeurogliaPotassium IsotopesSodium, DietaryCell MembraneErythrocytesLidocaineAdenosine TriphosphateIon Channel GatingEthers, CyclicNorepinephrineZona GlomerulosaBariumEvoked PotentialsDose-Response Relationship, DrugEpilepsyHippocampusRabbits