Defibrillators, ImplantableElectric StimulationElectric Stimulation TherapyElectrodes, ImplantedImplantable NeurostimulatorsTachycardia, VentricularEquipment FailureProstheses and ImplantsElectric CountershockVentricular FibrillationDeath, Sudden, CardiacPacemaker, ArtificialArrhythmias, CardiacInfusion Pumps, ImplantableCatsMuscle ContractionTranscutaneous Electric Nerve StimulationPhysical StimulationEquipment DesignTime FactorsStimulation, ChemicalDeep Brain StimulationElectrodesElectric InjuriesEquipment SafetyDevice RemovalAction PotentialsEvoked PotentialsReflexSyncopeEquipment Failure AnalysisTelemetryAnti-Arrhythmia AgentsVagus NerveRats, Sprague-DawleyMuscle, SkeletalCardiac Pacing, ArtificialElectromyographyAmplifiers, ElectronicNeural ProsthesesElectrocardiographyProsthesis ImplantationElectric Power SuppliesTranscranial Magnetic StimulationAfferent PathwaysNeurons, AfferentTreatment OutcomeDecerebrate StateMicroelectrodesElectrophysiologyNeuronsMotor NeuronsSpinal CordAmiodaroneSynaptic TransmissionNeurons, EfferentTachycardiaFollow-Up StudiesCardiac Resynchronization Therapy DevicesEvoked Potentials, SomatosensoryNeural InhibitionElectromagnetic PhenomenaNorepinephrineMusclesAtropineHeart FailureRadio Frequency Identification DeviceSpinal Cord InjuriesSympathetic Nervous SystemCells, CulturedElectrocardiography, AmbulatoryElectrophysiologic Techniques, CardiacGuanethidineDogsRats, WistarGuinea PigsNeural ConductionHeart-Assist DevicesCalciumEvoked Potentials, MotorHindlimbHeart RateNeural PathwaysEfferent PathwaysMotor CortexIsometric ContractionMedulla OblongataParasympathetic Nervous SystemMuscle FatigueRabbitsSplanchnic NervesMonitoring, AmbulatoryCardiac Resynchronization TherapyReaction TimeNerve FibersRats, Inbred StrainsHeart ArrestSelf StimulationWireless TechnologyTibial Nerve