Cardiac Pacing, ArtificialCardiac Resynchronization TherapyPacemaker, ArtificialVentricular Function, RightHeart FailureHeart-Assist DevicesVentricular DysfunctionVentricular Dysfunction, RightHeart VentriclesBundle-Branch BlockCardiac Resynchronization Therapy DevicesVentricular Dysfunction, LeftStroke VolumeCardiomyopathy, DilatedVentricular Function, LeftElectrocardiographyDouble Outlet Right VentricleTreatment OutcomeVentricular FunctionDefibrillators, ImplantableHemodynamicsCardiomyopathiesHeart Defects, CongenitalCardiac Surgical ProceduresEchocardiographyAtrioventricular BlockCardiac OutputCoronary SinusHeart Conduction SystemPulmonary Valve InsufficiencyEndomyocardial FibrosisEchocardiography, DopplerVentricular SeptumHeart Septal Defects, VentricularVentricular PressurePulmonary AtresiaHeart Bypass, RightHypoplastic Left Heart SyndromeMyocardial ContractionSystoleHeart TransplantationCardiac Output, LowHeart, ArtificialSternotomyEchocardiography, Three-DimensionalElectrophysiologic Techniques, CardiacVentricular RemodelingTetralogy of FallotProsthesis ImplantationAtrioventricular NodeBundle of HisExtracorporeal Membrane OxygenationHeart SeptumWound Closure TechniquesMagnetic Resonance Imaging, CineEunuchismVentricular Outflow ObstructionArrhythmias, CardiacHeart BlockEquipment DesignEndocardiumElectrodes, ImplantedTime FactorsEchocardiography, Doppler, ColorFollow-Up StudiesTricuspid Valve InsufficiencyCardiopulmonary BypassShock, CardiogenicHeart ValvesVena Cava, SuperiorHeart AtriaEndocardial FibroelastosisMitral Valve InsufficiencyPulmonary Valve StenosisGated Blood-Pool ImagingCardiac Imaging TechniquesBradycardiaPericardiectomyExercise ToleranceHeart Failure, SystolicTruncus Arteriosus, PersistentHeart-Lung MachineCardiac VolumeCatheterizationEquipment FailureIntraoperative CareCardiomyopathy, HypertrophicRetrospective StudiesVentricular Premature ComplexesSingle-Blind MethodHeart Septal Defects, AtrialTachycardia, VentricularTricuspid ValveProspective StudiesHeartDogsDiastoleHypertrophy, Right VentricularMyocarditisEchocardiography, Doppler, Pulsed