HeartHeart RateAnterior ChamberHeart FailureHeart DiseasesHeart Defects, CongenitalHeart TransplantationUpper ExtremityDiffusion Chambers, CultureFetal HeartHeart ValvesHeart AtriaAtmosphere Exposure ChambersHeart BlockMyocardiumUpper Gastrointestinal TractTime FactorsMyocardial ContractionHeart Function TestsHeart Arrest, InducedMyocardial IschemiaMyocytes, CardiacHemodynamicsVentricular Function, LeftPerfusionCoronary DiseaseEchocardiographyRisk FactorsCardiac Output, LowCardiomyopathy, DilatedProspective StudiesDogsStroke VolumeCardiomegalyTreatment OutcomeHeart InjuriesMyocardial InfarctionHeart SeptumFollow-Up StudiesHeart, ArtificialHeart Failure, SystolicCardiomyopathiesCardiotonic AgentsDisease Models, AnimalRats, Sprague-DawleyVentricular Dysfunction, LeftHeart Rate, FetalVentricular RemodelingOxygen ConsumptionMyocardial Reperfusion InjuryRheumatic Heart DiseaseHeart Valve ProsthesisRabbitsHeart ArrestCardiac Pacing, ArtificialRats, WistarAdrenergic beta-AntagonistsEquipment DesignChronic DiseaseHeart Failure, DiastolicRetrospective StudiesModels, CardiovascularAmerican Heart AssociationIrisDiastoleHeart Septal DefectsVentricular PressureDose-Response Relationship, DrugHeart NeoplasmsAutonomic Nervous SystemEnvironment, ControlledExercise TestSystoleAqueous HumorNatriuretic Peptide, BrainSympathetic Nervous SystemReproducibility of ResultsHypoplastic Left Heart SyndromeCells, CulturedEndocardiumPressureNational Heart, Lung, and Blood Institute (U.S.)Mice, Inbred C57BLBiological MarkersPredictive Value of TestsRNA, MessengerCalciumPacemaker, ArtificialAnterior Eye SegmentAge FactorsPrognosisCohort StudiesIsoproterenolRespirationGastrointestinal HemorrhageRisk AssessmentSeverity of Illness IndexNorepinephrineHypertrophy, Left VentricularLenses, Intraocular