Heart-Assist DevicesHeartHeart FailureHeart TransplantationProsthesis ImplantationHeart RateEquipment DesignShock, CardiogenicDevice RemovalAssisted CirculationProsthesis DesignCardiomyopathy, DilatedHeart DiseasesTreatment OutcomeVentricular Function, LeftHemodynamicsHeart, ArtificialExtracorporeal Membrane OxygenationEquipment FailureEquipment SafetyDevice ApprovalCardiomyopathiesVentricular Dysfunction, RightHeart Defects, CongenitalIntra-Aortic Balloon PumpingTime FactorsMiniaturizationVentricular Dysfunction, LeftRetrospective StudiesHeart VentriclesHydrodynamicsBiomedical EngineeringCompassionate Use TrialsWaiting ListsSelf-Help DevicesMyocardiumPulsatile FlowCardiac Surgical ProceduresOxygenatorsHeart AtriaStroke VolumeFetal HeartOxygenators, MembraneCardiac Output, LowArtificial OrgansSternotomyIntrauterine DevicesFollow-Up StudiesMyocytes, CardiacHeart ValvesEchocardiography, TransesophagealMyocardial ContractionVentricular Function, RightClenbuterolRisk FactorsProsthesis-Related InfectionsKidneys, ArtificialMyocardial IschemiaRisk AssessmentProstheses and ImplantsVentricular RemodelingMaintenanceEquipment and SuppliesRecovery of FunctionCounterpulsationProspective StudiesSeverity of Illness IndexBioartificial OrgansCholecystolithiasisProduct Surveillance, PostmarketingCardiac Resynchronization Therapy DevicesEchocardiographyModels, CardiovascularFatal OutcomePostoperative CareSurvival AnalysisDurable Medical EquipmentHeart BlockCathetersMyocarditisCardiopulmonary BypassThrombosisComputer-Aided DesignCardiotonic AgentsVentricular PressureFeasibility StudiesPostoperative ComplicationsSurvival RateUnited StatesSeptal Occluder DevicePreoperative PeriodMyocardial InfarctionForamen Ovale, PatentHemorrhageKaplan-Meier EstimateHeart Valve Prosthesis ImplantationHeart Function TestsPredictive Value of TestsPulmonary Wedge PressureMaterials Testing