ElectrodesCatheter AblationElectrodes, ImplantedAblation TechniquesIon-Selective ElectrodesElectrochemistryAtrial FibrillationElectrochemical TechniquesElectrophysiologic Techniques, CardiacPulmonary VeinsEquipment DesignMicroelectrodesHigh-Intensity Focused Ultrasound AblationPotentiometryBody Surface Potential MappingHeart Conduction SystemFluorocarbon PolymersGraphiteBiosensing TechniquesCryosurgeryGoldDesigner DrugsTreatment OutcomeTachycardia, SupraventricularElectric StimulationHeart AtriaElectrocardiographyLaser TherapySurgery, Computer-AssistedElectric ImpedanceMicrowavesAtrioventricular NodeTime FactorsCochlear ImplantsConductometryCochlear ImplantationTachycardia, VentricularEnzymes, ImmobilizedElectrocoagulationEquipment Failure AnalysisElectrophysiologyRadio WavesTachycardia, Ectopic AtrialWolff-Parkinson-White SyndromeCarbonElectric Stimulation TherapyCardiac Pacing, ArtificialElectricityElectroencephalographyEpicardial MappingAction PotentialsFluoroscopyPericardiumElectric CountershockFollow-Up StudiesRecurrenceBioelectric Energy SourcesDeep Brain StimulationElectromyographyFeasibility StudiesTin CompoundsEndocardiumSilver CompoundsSignal Processing, Computer-AssistedPlatinumCoronary SinusCardiac CathetersHeart SeptumTachycardiaNanotubes, CarbonDielectric SpectroscopyCalibrationSubdural SpaceDogsPolyvinyl ChlorideRadiography, InterventionalBundle of HisFerrocyanidesGlucose OxidaseTachycardia, ParoxysmalPacemaker, ArtificialScala TympaniHeart BlockLiver NeoplasmsMice, KnockoutElectronicsNeural ProsthesesAnti-Arrhythmia AgentsElectroporationElectrolysisGlassStereotaxic TechniquesTricuspid ValveVisual ProsthesisLoudness PerceptionHydrogen-Ion ConcentrationFlow Injection AnalysisNeuronsEvoked PotentialsReproducibility of Results