Patch-Clamp TechniquesMembrane PotentialsPotassium ChannelsElectrophysiologyGlucose Clamp TechniqueIon ChannelsElectric ConductivityCalcium ChannelsCalciumIon Channel GatingSodium ChannelsAction PotentialsChloride ChannelsGuinea PigsPotassiumPotassium Channel BlockersBariumCalcium Channels, L-TypeCalcium Channel BlockersSodiumPotassium Channels, Voltage-GatedChloridesDose-Response Relationship, DrugHeart VentriclesKineticsCells, CulturedAdenosine TriphosphateNeuronsTime FactorsSodium Channel BlockersPotassium Channels, Calcium-ActivatedMyocardiumMyocytes, CardiacHeart4-AminopyridineIon TransportTetraethylammoniumAjmalineCell MembraneRabbitsRats, Sprague-DawleyCesiumTetrodotoxinElectric StimulationRats, WistarVentricular FunctionXenopus laevisPotassium Channels, Inwardly RectifyingTetraethylammonium CompoundsCationsQuinidineHypotonic SolutionsDihydropyridinesGlyburideNifedipineCell LineOocytesSodium CyanidePinacidilHeart AtriaNiflumic AcidCalcium Channel AgonistsDelayed Rectifier Potassium ChannelsMuscle CellsFlufenamic AcidNodose GanglionAnti-Arrhythmia AgentsAnesthetics, InhalationAcetylcholineModels, BiologicalCell Membrane PermeabilityEgtazic AcidMibefradilNickelgamma-Aminobutyric AcidLarge-Conductance Calcium-Activated Potassium ChannelsXenonKATP ChannelsSinoatrial NodeCalcium SignalingGanglia, SpinalHydrogen-Ion ConcentrationReceptors, GABA-AInsulinReproducibility of ResultsSynaptic TransmissionOsmolar ConcentrationIonsIsofluraneFura-2ThionucleotidesAmilorideCadmiumCyclic AMP-Dependent Protein KinasesXenopusMuscle, SmoothChelating AgentsCyclic AMPCell SizeDogs