Heart FailureEchocardiographyHeartEchocardiography, DopplerHeart RateVentricular Function, LeftVentricular Dysfunction, LeftStroke VolumeCardiac Output, LowHeart VentriclesHeart Failure, SystolicHeart DiseasesHeart Failure, DiastolicEchocardiography, Doppler, ColorHemodynamicsCardiomyopathy, DilatedHeart AtriaDiastoleMitral ValveVentricular RemodelingNatriuretic Peptide, BrainHeart Defects, CongenitalSystoleMyocardiumEchocardiography, TransesophagealMyocardial ContractionCardiomyopathiesMitral Valve InsufficiencyProspective StudiesTreatment OutcomeEchocardiography, Three-DimensionalHypertrophy, Left VentricularFollow-Up StudiesHeart TransplantationPredictive Value of TestsCardiac Pacing, ArtificialTime FactorsElectrocardiographyChronic DiseaseCardiotonic AgentsPrognosisFetal HeartMyocardial InfarctionHeart Function TestsAdrenergic beta-AntagonistsCardiac CatheterizationTreatment FailureEchocardiography, Doppler, PulsedVentricular Function, RightHeart ValvesCardiomegalyExercise TestHeart SeptumRisk FactorsMitral Valve ProlapseSeverity of Illness IndexRetrospective StudiesMitral Valve StenosisAortic Valve InsufficiencyCardiac VolumeHeart Valve DiseasesVentricular Dysfunction, RightAtrial Function, LeftAortic ValveMyocardial IschemiaTricuspid ValveTricuspid Valve InsufficiencyHeart Septal Defects, VentricularHeart Valve ProsthesisCardiac Resynchronization TherapyVentricular DysfunctionCardiomyopathy, HypertrophicAortic Valve StenosisRheumatic Heart DiseasePulmonary Wedge PressureMyocytes, CardiacHeart-Assist DevicesBlood Flow VelocityBiological MarkersAtrial FibrillationReproducibility of ResultsVentricular PressureObserver VariationBlood PressureAngiotensin-Converting Enzyme InhibitorsDogsHeart NeoplasmsDiureticsExercise ToleranceHospitalizationDisease Models, AnimalPropanolaminesRisk AssessmentPacemaker, ArtificialSensitivity and SpecificityHeart Septal Defects, AtrialHeart Valve Prosthesis ImplantationDobutamineHeart BlockCardiac Output