Patch-Clamp TechniquesMembrane PotentialsPotassium ChannelsElectrophysiologyGlucose Clamp TechniqueIon ChannelsCalcium ChannelsElectric ConductivityCalciumIon Channel GatingAction PotentialsSodium ChannelsGuinea PigsChloride ChannelsPotassiumPotassium Channel BlockersBariumCalcium Channels, L-TypeCalcium Channel BlockersSodiumPotassium Channels, Voltage-GatedChloridesNeuronsDose-Response Relationship, DrugCells, CulturedAdenosine TriphosphateHeart VentriclesRats, Sprague-DawleySodium Channel BlockersElectric StimulationKinetics4-AminopyridineTetrodotoxinPotassium Channels, Calcium-ActivatedTetraethylammoniumMyocytes, CardiacRats, WistarMyocardiumAjmalineHeartCesiumIon TransportCell MembraneRabbitsVentricular FunctionTetraethylammonium CompoundsPotassium Channels, Inwardly RectifyingXenopus laevisTime FactorsQuinidineCationsHypotonic SolutionsDihydropyridinesgamma-Aminobutyric AcidGlyburideSynaptic TransmissionNifedipineSodium CyanidePinacidilOocytesCell LineHeart AtriaCalcium Channel AgonistsNiflumic AcidDelayed Rectifier Potassium ChannelsFlufenamic AcidMuscle CellsAcetylcholineNodose GanglionReceptors, GABA-AAnesthetics, InhalationAnti-Arrhythmia AgentsEgtazic AcidHippocampusMibefradilLarge-Conductance Calcium-Activated Potassium ChannelsNickelKATP ChannelsCalcium SignalingCell Membrane PermeabilitySinoatrial NodeGanglia, SpinalXenonAnimals, NewbornThionucleotidesIsofluraneInsulinCadmiumCyclic AMP-Dependent Protein KinasesReceptors, MuscarinicFura-2Evoked PotentialsCyclic AMPChelating AgentsAmilorideOsmolar ConcentrationIonsProtein Kinase CXenopusModels, Biological