Atrial Function, LeftAtrial FunctionHeart FailureAtrial Function, RightHeart AtriaHeartEchocardiography, DopplerAtrial FibrillationVentricular Function, LeftMyocardial ContractionEchocardiographyEchocardiography, Doppler, PulsedElectric CountershockPericardiectomyHeart Function TestsStroke VolumeHeart RateHemodynamicsCardiac Output, LowHeart Failure, SystolicVentricular Dysfunction, LeftEchocardiography, TransesophagealVentricular FunctionHeart Failure, DiastolicMyocardiumObserver VariationBlood Flow VelocityHeart DiseasesCardiomyopathy, DilatedNatriuretic Peptide, BrainHeart TransplantationVentricular RemodelingChronic DiseaseTreatment FailureTreatment OutcomeAdrenergic beta-AntagonistsCardiotonic AgentsTime FactorsHeart Defects, CongenitalHypertrophy, Left VentricularCardiac Pacing, ArtificialHeart VentriclesMyocardial InfarctionFollow-Up StudiesCardiomyopathiesProspective StudiesMyocytes, CardiacHeart-Assist DevicesPrognosisSystoleRisk FactorsCardiomegalyDiastoleAngiotensin-Converting Enzyme InhibitorsDiureticsMyocardial IschemiaDogsExercise TestHospitalizationFetal HeartPropanolaminesDisease Models, AnimalPredictive Value of TestsRetrospective StudiesBiological MarkersSeverity of Illness IndexVentricular PressureHeart ValvesExercise ToleranceElectrocardiographyAtrial Natriuretic FactorKidney Failure, ChronicVentricular DysfunctionDigoxinBlood PressureSympathetic Nervous SystemOxygen ConsumptionCarbazolesHeart BlockRisk AssessmentPulmonary Wedge PressurePatient ReadmissionProportional Hazards ModelsCoronary DiseaseCardiovascular AgentsPacemaker, ArtificialDouble-Blind MethodSurvival AnalysisMineralocorticoid Receptor AntagonistsMetoprololCohort StudiesSurvival RateSpironolactoneNorepinephrineFibrosisArrhythmias, CardiacFailure to ThriveAcute DiseaseVasodilator AgentsCardiac Resynchronization Therapy