HeartHeart RateHeart FailureHeart DiseasesHeart Defects, CongenitalHeart TransplantationFetal HeartHeart ValvesHeart AtriaHeart BlockMyocardiumHeart Arrest, InducedHeart Function TestsMyocardial ContractionMyocardial IschemiaMyocytes, CardiacCoronary DiseaseHemodynamicsTime FactorsCardiac Output, LowVentricular Function, LeftHeart, ArtificialHeart Failure, SystolicPerfusionRisk FactorsCardiomyopathy, DilatedMyocardial InfarctionCardiomegalyHeart InjuriesHeart Rate, FetalHeart SeptumCardiotonic AgentsCardiomyopathiesEchocardiographyRheumatic Heart DiseaseStroke VolumeMyocardial Reperfusion InjuryHeart ArrestHeart Valve ProsthesisMolecular Sequence DataVentricular Dysfunction, LeftAdrenergic beta-AntagonistsHeart Failure, DiastolicDogsAmerican Heart AssociationProspective StudiesVentricular RemodelingFollow-Up StudiesTreatment OutcomeOxygen ConsumptionDisease Models, AnimalRats, Sprague-DawleyChronic DiseaseAutonomic Nervous SystemCardiac Pacing, ArtificialHeart Septal DefectsHypoplastic Left Heart SyndromeHeart NeoplasmsRats, WistarNational Heart, Lung, and Blood Institute (U.S.)Natriuretic Peptide, BrainVentricular PressureBase SequenceExercise TestSympathetic Nervous SystemMutationModels, CardiovascularAmino Acid SequenceRNA, MessengerRabbitsSystoleEndocardiumBiological MarkersDiastolePrognosisCalciumIsoproterenolRetrospective StudiesCohort StudiesRisk AssessmentPropanolaminesHeart Septal Defects, VentricularPredictive Value of TestsIschemic Preconditioning, MyocardialCardiovascular DiseasesPhenotypeMyocarditisMice, Inbred C57BLHeart-Assist DevicesElectrocardiography, AmbulatoryNorepinephrineAge FactorsDose-Response Relationship, DrugAnti-Arrhythmia AgentsHeart Valve Prosthesis ImplantationHypertrophy, Left VentricularCardiac Surgical ProceduresMyocardial ReperfusionSignal TransductionHeart Septal Defects, Atrial