Patch-Clamp TechniquesMembrane PotentialsPotassium ChannelsIon ChannelsElectrophysiologyIon Channel GatingGlucose Clamp TechniqueElectric ConductivityCalcium ChannelsCalciumSodium ChannelsAction PotentialsChloride ChannelsGuinea PigsPotassiumBariumPotassium Channel BlockersCalcium Channels, L-TypeSodiumCalcium Channel BlockersIon TransportChloridesPotassium Channels, Voltage-GatedDose-Response Relationship, DrugAdenosine TriphosphateCells, CulturedHeart VentriclesKineticsNeuronsPotassium Channels, Calcium-ActivatedSodium Channel BlockersMyocytes, Cardiac4-AminopyridineTetraethylammoniumMyocardiumCesiumCell MembraneAjmalineHeartCationsTetrodotoxinRabbitsXenopus laevisRats, Sprague-DawleyElectric StimulationVentricular FunctionPotassium Channels, Inwardly RectifyingTetraethylammonium CompoundsRats, WistarQuinidineHypotonic SolutionsDihydropyridinesTime FactorsGlyburideNifedipineCell LineSodium CyanidePinacidilOocytesNiflumic AcidHeart AtriaCalcium Channel AgonistsDelayed Rectifier Potassium ChannelsMuscle CellsFlufenamic AcidNodose GanglionNickelCell Membrane PermeabilityAnti-Arrhythmia AgentsAcetylcholineEgtazic AcidAnesthetics, InhalationMibefradilLarge-Conductance Calcium-Activated Potassium Channelsgamma-Aminobutyric AcidKATP ChannelsSinoatrial NodeCalcium SignalingGanglia, SpinalHydrogen-Ion ConcentrationReceptors, GABA-AXenonCadmiumSynaptic TransmissionAmilorideInsulinThionucleotidesChelating AgentsXenopusModels, BiologicalOsmolar ConcentrationIsofluraneFura-2MagnesiumCyclic AMP-Dependent Protein KinasesMuscle, SmoothIonsCyclic AMPSodium-Calcium ExchangerProtein Kinase C