HeartHeart FailureHeart RateTreatment FailureHeart DiseasesHeart TransplantationHeart Defects, CongenitalFetal HeartHeart ValvesHeart AtriaMyocardiumCardiac Output, LowKidney Failure, ChronicFailure to ThriveHeart Failure, SystolicHeart BlockTime FactorsMyocardial ContractionHeart Function TestsHemodynamicsLiver Failure, AcuteTreatment OutcomeHeart Failure, DiastolicVentricular Function, LeftHeart Arrest, InducedStroke VolumeCardiomyopathy, DilatedMyocardial IschemiaRisk FactorsProspective StudiesFollow-Up StudiesLiver FailureEchocardiographyCardiotonic AgentsChronic DiseaseCardiomegalyMyocardial InfarctionAdrenergic beta-AntagonistsMultiple Organ FailureCoronary DiseaseCardiomyopathiesVentricular RemodelingNatriuretic Peptide, BrainMyocytes, CardiacRetrospective StudiesEquipment FailureDisease Models, AnimalCardiac Pacing, ArtificialDogsPrognosisAcute Kidney InjuryHeart, ArtificialRespiratory InsufficiencyHeart InjuriesProsthesis FailureHeart Valve ProsthesisHeart SeptumRheumatic Heart DiseasePerfusionExercise TestOxygen ConsumptionBiological MarkersHeart ArrestRats, Sprague-DawleyMyocardial Reperfusion InjuryPredictive Value of TestsHeart Rate, FetalHeart-Assist DevicesSeverity of Illness IndexSympathetic Nervous SystemVentricular PressureCohort StudiesSystoleRisk AssessmentRats, WistarAmerican Heart AssociationPropanolaminesDiastoleRenal InsufficiencyDiureticsVentricular Dysfunction, LeftAutonomic Nervous SystemKidneyHospitalizationSurvival AnalysisModels, CardiovascularProportional Hazards ModelsAcute DiseaseSurvival RateHeart NeoplasmsVentricular DysfunctionNorepinephrineAge FactorsHeart Septal DefectsDouble-Blind MethodMyocarditisNational Heart, Lung, and Blood Institute (U.S.)Hypoplastic Left Heart SyndromeCalciumFibrosis