HeartHeart RateHeart FailureHeart DiseasesHeart TransplantationHeart Defects, CongenitalFetal HeartHeart ValvesHeart AtriaHeart BlockMyocardiumHeart Arrest, InducedHeart Function TestsMyocardial ContractionMyocardial IschemiaMyocytes, CardiacCoronary DiseaseHemodynamicsTime FactorsCardiac Output, LowVentricular Function, LeftRisk FactorsHeart, ArtificialPerfusionHeart Failure, SystolicMyocardial InfarctionCardiomyopathy, DilatedCardiomegalyHeart InjuriesHeart SeptumCardiotonic AgentsHeart Rate, FetalEchocardiographyStroke VolumeCardiomyopathiesRheumatic Heart DiseaseMyocardial Reperfusion InjuryHeart ArrestHeart Valve ProsthesisVentricular Dysfunction, LeftAdrenergic beta-AntagonistsProspective StudiesHeart Failure, DiastolicAmerican Heart AssociationDogsVentricular RemodelingFollow-Up StudiesTreatment OutcomeChronic DiseaseOxygen ConsumptionRats, Sprague-DawleyDisease Models, AnimalAutonomic Nervous SystemCardiac Pacing, ArtificialHeart Septal DefectsHypoplastic Left Heart SyndromeHeart NeoplasmsRats, WistarNatriuretic Peptide, BrainNational Heart, Lung, and Blood Institute (U.S.)Exercise TestVentricular PressureModels, CardiovascularSympathetic Nervous SystemBiological MarkersSystoleEndocardiumPredictive Value of TestsPrognosisDiastoleRetrospective StudiesIsoproterenolRabbitsCohort StudiesRisk AssessmentCalciumCardiovascular DiseasesPropanolaminesHeart Septal Defects, VentricularRNA, MessengerIschemic Preconditioning, MyocardialMyocarditisUnited StatesAge FactorsElectrocardiography, AmbulatoryHeart-Assist DevicesNorepinephrineMice, Inbred C57BLDose-Response Relationship, DrugAnti-Arrhythmia AgentsSeverity of Illness IndexMolecular Sequence DataHypertrophy, Left VentricularMice, KnockoutCardiac Surgical ProceduresHeart Valve Prosthesis ImplantationMyocardial ReperfusionVentricular DysfunctionHeart Septal Defects, AtrialSignal Transduction