Patch-Clamp TechniquesMembrane PotentialsPotassium ChannelsElectrophysiologyIon ChannelsIon Channel GatingElectric ConductivityGlucose Clamp TechniqueCalcium ChannelsCalciumAction PotentialsSodium ChannelsChloride ChannelsGuinea PigsPotassiumBariumPotassium Channel BlockersCalcium Channels, L-TypeSodiumCalcium Channel BlockersPotassium Channels, Voltage-GatedChloridesKineticsDose-Response Relationship, DrugHeart VentriclesNeuronsTetraethylammoniumSodium Channel BlockersXenopus laevisAdenosine TriphosphateTetrodotoxinCesiumPotassium Channels, Calcium-ActivatedCells, CulturedElectric StimulationOocytesIon TransportMyocardiumHeartMyocytes, CardiacTetraethylammonium CompoundsCell MembraneVentricular Function4-AminopyridineRabbitsRats, Sprague-DawleyAjmalinePotassium Channels, Inwardly RectifyingTime FactorsRats, WistarCationsQuinidineDihydropyridinesNifedipineHypotonic SolutionsCell LineHeart AtriaCalcium Channel AgonistsLarge-Conductance Calcium-Activated Potassium ChannelsGlyburideNiflumic AcidPinacidilXenopusSodium CyanideEgtazic AcidCell Membrane PermeabilityFlufenamic AcidMuscle CellsAnti-Arrhythmia AgentsAcetylcholineNodose GanglionDelayed Rectifier Potassium ChannelsSinoatrial NodeNickelgamma-Aminobutyric AcidModels, BiologicalMibefradilCalcium SignalingGanglia, SpinalAnesthetics, InhalationSynaptic TransmissionCadmiumKATP ChannelsHydrogen-Ion ConcentrationEther-A-Go-Go Potassium ChannelsAmilorideXenonReceptors, GABA-AThionucleotidesFura-2Osmolar ConcentrationSodium-Calcium ExchangerMicroelectrodesMuscle, SmoothChelating AgentsCyclic AMPInsulinIsofluraneRNA, ComplementarySarcolemma