Myocytes, CardiacCardiac OutputHeartDevice ApprovalCardiac Surgical ProceduresArrhythmias, CardiacDeath, Sudden, CardiacEquipment DesignCardiac CatheterizationCardiac Pacing, ArtificialEquipment SafetyCardiac TamponadeIntrauterine DevicesHeart DiseasesCardiomegalyMyocardiumDevice RemovalMyocardial ContractionHeart VentriclesHeart ArrestHeart FailureEquipment and SuppliesTime FactorsCardiomyopathiesElectrocardiographyTreatment OutcomeMyoblasts, CardiacSeptal Occluder DeviceCardiac Imaging TechniquesEchocardiographyCardiac MyosinsHeart RateHemodynamicsHeart TransplantationCardiac GlycosidesCardiac Output, LowOut-of-Hospital Cardiac ArrestMicrofluidic Analytical TechniquesMyocardial InfarctionVentricular Function, LeftVentricular RemodelingCardiac VolumeTroponin ICardiac Resynchronization TherapySelf-Help DevicesProspective StudiesHeart Defects, CongenitalPacemaker, ArtificialBlood PressureProstheses and ImplantsStroke VolumeCardiopulmonary ResuscitationDogsCardiomyopathy, DilatedHeart Function TestsEquipment FailureVentricular Dysfunction, LeftOptical DevicesHeart Conduction SystemFollow-Up StudiesIntrauterine Devices, CopperTroponin TCardiac Care FacilitiesModels, CardiovascularMyocardial IschemiaHeart NeoplasmsCardiotonic AgentsRetrospective StudiesDefibrillators, ImplantableEquipment Failure AnalysisCardiac ElectrophysiologyCardiac Resynchronization Therapy DevicesRats, Sprague-DawleyDisease Models, AnimalHeart AtriaFibrosisReproducibility of ResultsFetal HeartCalciumPostoperative ComplicationsVentricular FunctionLab-On-A-Chip DevicesCells, CulturedProsthesis ImplantationRisk FactorsHeart InjuriesCardiopulmonary BypassProsthesis DesignPredictive Value of TestsUnited States Food and Drug AdministrationMedical Device LegislationRisk AssessmentMyocarditisHemostatic TechniquesHypertrophy, Left VentricularMonitoring, PhysiologicTroponinIntrauterine Devices, MedicatedVentricular FibrillationMice, Transgenic