HeartHeart FailureHeart RateCardiac Output, LowHeart TransplantationCardiac Pacing, ArtificialCardiomyopathy, DilatedHeart DiseasesHemodynamicsHeart-Assist DevicesHeart Defects, CongenitalEnoximoneStroke VolumeCardiotonic AgentsVentricular Dysfunction, LeftDiureticsPacemaker, ArtificialSeverity of Illness IndexMyocardiumPulmonary Wedge PressureHydrazonesVentricular Function, LeftTreatment OutcomeAdrenergic beta-AntagonistsCardiomyopathiesMyocardial ContractionFetal HeartTime FactorsVentricular DysfunctionBundle-Branch BlockNatriuretic Peptide, BrainSpironolactoneMineralocorticoid Receptor AntagonistsChronic DiseaseVentricular RemodelingEchocardiographyHeart ValvesAtrial Natriuretic FactorPyridazinesHeart AtriaDouble-Blind MethodProspective StudiesFollow-Up StudiesAngiotensin-Converting Enzyme InhibitorsCardiac Resynchronization TherapyAmiodaroneExercise TestSympathetic Nervous SystemCaptoprilVasodilator AgentsHeart BlockMyocardial InfarctionOxygen ConsumptionHeart VentriclesPrognosisDobutamineEnalaprilRisk FactorsAnti-Arrhythmia AgentsMitral Valve InsufficiencyPredictive Value of TestsHeart Arrest, InducedHeart Function TestsElectrocardiographyAldosteroneSurvival AnalysisCardiac CatheterizationCardiac OutputArrhythmias, CardiacMyocardial IschemiaDefibrillators, ImplantableHospitalizationKidneyMyocytes, CardiacDose-Response Relationship, DrugRetrospective StudiesBiological MarkersDrug Therapy, CombinationCoronary DiseaseProportional Hazards ModelsSurvival RatePatient SelectionBlood PressureHeart, ArtificialHeart Failure, SystolicPerfusionCardiomegalyHeart InjuriesHeart Rate, FetalHeart SeptumRheumatic Heart DiseaseMyocardial Reperfusion InjuryHeart ArrestHeart Valve ProsthesisHeart Failure, DiastolicAmerican Heart AssociationDogsAutonomic Nervous SystemHeart Septal DefectsHypoplastic Left Heart Syndrome