ElectrodesDefibrillators, ImplantableElectrodes, ImplantedImplantable NeurostimulatorsEquipment FailureTachycardia, VentricularElectric CountershockVentricular FibrillationProstheses and ImplantsPacemaker, ArtificialDeath, Sudden, CardiacEquipment DesignInfusion Pumps, ImplantableIon-Selective ElectrodesArrhythmias, CardiacEquipment Failure AnalysisElectrochemistryElectric InjuriesEquipment SafetyDevice RemovalSyncopeTelemetryNeural ProsthesesElectrochemical TechniquesElectric Power SuppliesAnti-Arrhythmia AgentsCardiac Pacing, ArtificialMicroelectrodesElectrocardiographyBiosensing TechniquesProsthesis ImplantationAmplifiers, ElectronicAmiodaroneCardiac Resynchronization Therapy DevicesElectric Stimulation TherapyRadio Frequency Identification DeviceElectrocardiography, AmbulatoryTreatment OutcomeElectrophysiologic Techniques, CardiacElectromagnetic PhenomenaFollow-Up StudiesPotentiometryHeart-Assist DevicesHeart FailureElectric StimulationMonitoring, AmbulatoryFluorocarbon PolymersElectric ImpedanceGraphiteCardiac Resynchronization TherapyTime FactorsTachycardiaElectricityWireless TechnologyHeart ArrestPrimary PreventionCatheters, IndwellingMiniaturizationMonitoring, PhysiologicSignal Processing, Computer-AssistedGoldBioelectric Energy SourcesElectronics, MedicalElectronicsMicro-Electrical-Mechanical SystemsRemote Sensing TechnologyCochlear ImplantsConductometryProsthesis-Related InfectionsCochlear ImplantationElectrolysisProspective StudiesTachycardia, SupraventricularRetrospective StudiesEnzymes, ImmobilizedStroke VolumeVentricular Dysfunction, LeftElectroencephalographyAtrial FibrillationCatheter AblationElectroplatingCardiomyopathiesRisk AssessmentDeath, SuddenBiocompatible MaterialsBrugada SyndromeImplants, ExperimentalHeart Conduction SystemFeasibility StudiesElectrophysiologyElectromagnetic FieldsCarbonCardiomyopathy, DilatedSemiconductorsGlucose OxidaseProsthesis DesignAction PotentialsPolymersRisk FactorsReproducibility of Results