Heart Septal Defects, VentricularFluorescent DyesSeptal Occluder DeviceCalciumArsenazo IIIFura-2Membrane PotentialsIon Channel GatingBenzofuransColoring AgentsXanthenesCalcium SignalingElectrophysiologyAction PotentialsCardiac Surgical ProceduresCardiac CatheterizationSodiumChloridesKineticsElectric StimulationNeuronsHydrogen-Ion ConcentrationMicroscopy, FluorescenceSpectrometry, FluorescenceCells, CulturedPatch-Clamp TechniquesElectric ConductivityTime FactorsRats, Sprague-DawleyHair DyesIon ChannelsTreatment OutcomePotassium ChannelsPotassiumRosaniline DyesOocytesXenopus laevisVoltage-Sensitive Dye ImagingCalcium ChannelsShaker Superfamily of Potassium ChannelsBariumElectricityPotassium Channels, Voltage-GatedTetraethylammoniumTetrodotoxinXenopusCesiumTetraethylammonium CompoundsPyridinium CompoundsModels, BiologicalDecapodiformesCarbocyaninesPotassium Channel BlockersMicroelectrodesGuinea PigsElectric CapacitanceAmaranth DyeCell MembraneSodium Channel BlockersCalcium Channel BlockersCalcium Channels, L-TypeRana pipiensDye Dilution TechniqueLarge-Conductance Calcium-Activated Potassium ChannelsBiophysicsCell Membrane PermeabilityElectric Power SuppliesElectrochemistryBiophysical PhenomenaIon TransportGap JunctionsMathematicsHyperpolarization-Activated Cyclic Nucleotide-Gated ChannelsEther-A-Go-Go Potassium ChannelsRana catesbeianaKv1.2 Potassium ChannelElectrodesLissamine Green DyesCyclic Nucleotide-Gated Cation ChannelsChloride ChannelsRana esculentaLipid BilayersConnexinsHeartAnuraDose-Response Relationship, DrugRhodaminesRana temporariaPurkinje FibersQuaternary Ammonium CompoundsMusclesMyocardiumHeart Conduction SystemModels, NeurologicalFood Coloring AgentsVentricular FunctionSpider VenomsEgtazic AcidAxonsRabbits