Heart FailureHeartHeart RateHeart DiseasesHeart Defects, CongenitalCoronary DiseaseCardiac Output, LowHeart Failure, SystolicHeart TransplantationMyocardiumMyocardial IschemiaRisk FactorsHeart Failure, DiastolicRheumatic Heart DiseaseStroke VolumeCardiomyopathy, DilatedVentricular Function, LeftHemodynamicsVentricular Dysfunction, LeftFetal HeartNatriuretic Peptide, BrainProspective StudiesChronic DiseaseFollow-Up StudiesEchocardiographyMyocardial InfarctionHeart ValvesTime FactorsHeart AtriaMyocardial ContractionAdrenergic beta-AntagonistsHeart Function TestsTreatment OutcomeCardiomyopathiesVentricular RemodelingCardiotonic AgentsTreatment FailureMyocytes, CardiacCardiomegalyCardiac Pacing, ArtificialPrognosisHeart BlockBiological MarkersExercise TestCohort StudiesRetrospective StudiesRisk AssessmentPredictive Value of TestsHospitalizationDiureticsProportional Hazards ModelsSystoleHeart-Assist DevicesDisease Models, AnimalSeverity of Illness IndexCardiovascular DiseasesDiastolePropanolaminesDogsAngiotensin-Converting Enzyme InhibitorsIncidenceHeart VentriclesOxygen ConsumptionVentricular DysfunctionElectrocardiographyHeart Arrest, InducedAge FactorsEchocardiography, DopplerUnited StatesSympathetic Nervous SystemCyanosisDeath, Sudden, CardiacCarcinoid Heart DiseaseCase-Control StudiesVentricular PressureDigoxinBlood PressureCause of DeathDouble-Blind MethodMyocarditisSurvival AnalysisPrevalenceAtrial FibrillationKidney Failure, ChronicExercise ToleranceSurvival RateCarbazolesRiskPacemaker, ArtificialSex FactorsHeart Valve DiseasesArrhythmias, CardiacPatient ReadmissionAtrial Natriuretic FactorPulmonary Wedge PressureHypertrophy, Left VentricularCardiologyComorbidityCardiovascular AgentsMetoprolol