Heart VentriclesMyocardiumHeartHeart FailureHeart RateCardiac Output, LowCerebral VentriclesHeart TransplantationThird VentricleFourth VentricleCardiac Pacing, ArtificialHemodynamicsCardiomyopathy, DilatedHeart Defects, CongenitalHeart DiseasesHeart-Assist DevicesLateral VentriclesStroke VolumeMyocardial ContractionEnoximoneCerebral Ventricle NeoplasmsVentricular Function, LeftVentricular Dysfunction, LeftCardiotonic AgentsPacemaker, ArtificialFetal HeartEchocardiographyCardiomyopathiesSeverity of Illness IndexHeart AtriaTreatment OutcomeDiureticsTime FactorsVentricular RemodelingPulmonary Wedge PressureAdrenergic beta-AntagonistsVentricular DysfunctionHydrazonesBundle-Branch BlockNatriuretic Peptide, BrainHeart ValvesAtrial Natriuretic FactorVentricular FunctionChronic DiseaseMineralocorticoid Receptor AntagonistsSpironolactoneElectrocardiographyMyocardial InfarctionFollow-Up StudiesProspective StudiesHeart BlockSympathetic Nervous SystemAngiotensin-Converting Enzyme InhibitorsExercise TestCardiac Resynchronization TherapyPyridazinesDouble-Blind MethodCardiac CatheterizationDogsCaptoprilAmiodaroneVasodilator AgentsOxygen ConsumptionAnti-Arrhythmia AgentsHeart Function TestsMyocytes, CardiacMitral Valve InsufficiencyHeart SeptumDobutamineCardiomegalyArrhythmias, CardiacCardiac OutputPrognosisEndocardiumVentricular Function, Right