Heart SeptumHeartSeptum of BrainHeart RateVentricular SeptumSeptum PellucidumAtrial SeptumNasal SeptumHeart FailureHeart DiseasesHeart Defects, CongenitalHeart TransplantationFetal HeartUpper ExtremityHeart AtriaHeart ValvesMyocardiumHeart BlockUpper Gastrointestinal TractEchocardiographyMyocardial ContractionHeart Arrest, InducedTime FactorsHeart Septal DefectsHeart Function TestsHeart Septal Defects, VentricularMyocardial IschemiaHemodynamicsVentricular Function, LeftMyocytes, CardiacPulmonary AtresiaCoronary DiseaseSeptal NucleiCardiomyopathiesHeart Septal Defects, AtrialTreatment OutcomeCardiomegalyDogsRisk FactorsCardiac Output, LowMyocardial InfarctionProspective StudiesPerfusionFollow-Up StudiesCardiomyopathy, DilatedStroke VolumeHeart InjuriesCardiac Pacing, ArtificialRats, Sprague-DawleyEndocardiumVentricular Dysfunction, LeftHypoplastic Left Heart SyndromeHeart, ArtificialHeart Failure, SystolicCardiotonic AgentsHeart Rate, FetalVentricular RemodelingDiagonal Band of BrocaChitin SynthaseRetrospective StudiesRheumatic Heart DiseaseRats, WistarCardiomyopathy, HypertrophicMyocardial Reperfusion InjuryHeart VentriclesAdrenergic beta-AntagonistsHeart ArrestDisease Models, AnimalHeart Valve ProsthesisChronic DiseaseHeart Failure, DiastolicInfant, NewbornModels, CardiovascularAmerican Heart AssociationCardiac Surgical ProceduresVentricular PressureSystoleEchocardiography, DopplerCell WallHeart AneurysmAtrioventricular NodeDiastoleCardiac CatheterizationOxygen ConsumptionExercise TestMicroscopy, Electron