Cardiac Output, HighHeart FailureCardiac OutputVentricular Function, LeftHeartHeart RateStroke VolumeMyocytes, CardiacHemodynamicsVentricular Dysfunction, LeftCardiac Output, LowVentricular Function, RightHeart VentriclesEchocardiographyMyocardial ContractionMyocardiumVentricular FunctionHeart DiseasesMyocardial InfarctionHeart Function TestsCardiac Pacing, ArtificialCardiac Surgical ProceduresBlood PressureArrhythmias, CardiacTime FactorsThermodilutionCardiomyopathy, DilatedVentricular RemodelingCardiac CatheterizationElectrocardiographyCardiomyopathiesSystoleDogsCardiomegalyCardiotonic AgentsVascular ResistanceDeath, Sudden, CardiacTreatment OutcomeDiastoleHeart TransplantationProspective StudiesEchocardiography, DopplerNatriuretic Peptide, BrainHeart Defects, CongenitalHeart Failure, SystolicExercise TestAdrenergic beta-AntagonistsCardiac VolumeMyocardial IschemiaFollow-Up StudiesOxygen ConsumptionVentricular Dysfunction, RightHeart Failure, DiastolicVentricular PressureHypertrophy, Left Ventricular