Defibrillators, ImplantableDefibrillatorsElectric CountershockEquipment FailurePacemaker, ArtificialTachycardia, VentricularVentricular FibrillationElectrodes, ImplantedDeath, Sudden, CardiacArrhythmias, CardiacDevice RemovalCardiac Pacing, ArtificialEquipment SafetyHeart ArrestEquipment DesignElectric InjuriesCardiac Resynchronization TherapyCentral Nervous System Vascular MalformationsElectrocardiographyTreatment OutcomeProsthesis ImplantationImplantable NeurostimulatorsBalloon OcclusionCardiac Resynchronization Therapy DevicesProstheses and ImplantsAnti-Arrhythmia AgentsEmbolization, TherapeuticAmiodaroneCavernous SinusCarotid-Cavernous Sinus FistulaFollow-Up StudiesEquipment Failure AnalysisHeart FailureCoronary SinusSyncopeTachycardiaSubclavian VeinCardiopulmonary ResuscitationInfusion Pumps, ImplantableCerebral VeinsCranial SinusesArteriovenous FistulaRetrospective StudiesPolyvinylsHeart BlockProspective StudiesAtrial FibrillationVentricular Dysfunction, LeftForeign-Body MigrationTelemetryElectrophysiologic Techniques, CardiacElectrocardiography, AmbulatoryTime FactorsVena Cava, SuperiorFeasibility StudiesOut-of-Hospital Cardiac ArrestVenous CutdownCatheterization, PeripheralStroke VolumeBrugada SyndromeCardiomyopathiesDura MaterElectromagnetic PhenomenaBradycardiaTachycardia, SupraventricularPrimary PreventionCatheterizationRisk AssessmentRecurrenceRemote Sensing TechnologyPhlebographyBundle-Branch BlockEndocardiumDeath, SuddenCardiac ElectrophysiologyHeart VentriclesRisk FactorsHeart Conduction SystemCardiography, ImpedanceHeart-Assist DevicesSurvival RateCardiomyopathy, DilatedThoracotomyMonitoring, AmbulatoryVolunteersPericardiumCerebral AngiographyCardiac CatheterizationElectrodesMitral Valve StenosisSurvival AnalysisEsophageal and Gastric VaricesTherapy, Computer-AssistedArrhythmogenic Right Ventricular DysplasiaFemoral VeinMagnetsElectric Power SuppliesEmergency Medical ServicesProsthesis FailureCatheter Ablation