Heart-Assist DevicesHeart VentriclesHeart FailureVentricular Function, LeftHeart TransplantationProsthesis ImplantationVentricular Dysfunction, LeftShock, CardiogenicEquipment DesignMyocardiumVentricular FunctionHemodynamicsCardiomyopathy, DilatedDevice RemovalCerebral VentriclesMyocardial ContractionEchocardiographyHeartVentricular Dysfunction, RightAssisted CirculationTreatment OutcomeProsthesis DesignCardiomyopathiesThird VentricleStroke VolumeFourth VentricleHypertrophy, Left VentricularVentricular Function, RightVentricular RemodelingTime FactorsExtracorporeal Membrane OxygenationEquipment FailureLateral VentriclesDogsEquipment SafetyCardiac Surgical ProceduresDevice ApprovalCerebral Ventricle NeoplasmsVentricular PressureEndocardiumModels, CardiovascularHeart, ArtificialIntra-Aortic Balloon PumpingHeart AtriaDiastoleEchocardiography, TransesophagealElectrocardiographyRetrospective StudiesPericardiumMyocardial InfarctionHeart DiseasesSystoleBlood PressureMiniaturizationHeart AneurysmHeart Defects, CongenitalHeart SeptumHydrodynamicsCardiac CatheterizationCardiac VolumeCardiac OutputMyocytes, CardiacBiomedical EngineeringPulsatile FlowFollow-Up StudiesMyocardial IschemiaCompassionate Use TrialsCoronary CirculationEchocardiography, DopplerSelf-Help DevicesCardiomegalyWaiting ListsAngiocardiographyMitral ValveHeart RateFatal OutcomeCardiac Pacing, ArtificialCardiac Output, LowOxygenatorsTachycardia, VentricularPulmonary ArterySternotomyTransposition of Great VesselsEndomyocardial FibrosisOxygenators, MembraneFeasibility StudiesCardiotonic AgentsSeverity of Illness IndexPhonocardiographyCardiopulmonary BypassArtificial OrgansDisease Models, AnimalIntrauterine DevicesProspective StudiesFistulaReproducibility of ResultsHeart Valve Prosthesis ImplantationMitral Valve InsufficiencyHeart Conduction SystemAortic Valve