Defibrillators, ImplantableDefibrillatorsTachycardia, VentricularElectric CountershockVentricular FibrillationDeath, Sudden, CardiacEquipment FailureArrhythmias, CardiacAnti-Arrhythmia AgentsAmiodaronePacemaker, ArtificialHeart ArrestCardiac Pacing, ArtificialEquipment DesignElectrodes, ImplantedSyncopeElectrocardiographyElectric InjuriesEquipment SafetyTachycardiaDeath, SuddenHeart FailureDevice RemovalImplantable NeurostimulatorsFollow-Up StudiesTreatment OutcomeSotalolCardiac Resynchronization TherapyProstheses and ImplantsEquipment Failure AnalysisVentricular Dysfunction, LeftStroke VolumeProsthesis ImplantationCardiopulmonary ResuscitationSurvival RateCardiac Resynchronization Therapy DevicesInfusion Pumps, ImplantableProspective StudiesMulticenter Studies as TopicRetrospective StudiesCost-Benefit AnalysisRisk AssessmentTime FactorsTelemetrySurvival AnalysisElectrophysiologic Techniques, CardiacRisk FactorsElectrocardiography, AmbulatoryRecurrenceOut-of-Hospital Cardiac ArrestRandomized Controlled Trials as TopicRegistriesBrugada SyndromeCardiomyopathiesElectromagnetic PhenomenaTachycardia, SupraventricularPrimary PreventionRemote Sensing TechnologyCardiac ElectrophysiologyAtrial FibrillationCardiography, ImpedanceHeart-Assist DevicesCardiomyopathy, DilatedMonitoring, Ambulatory