EchocardiographyEchocardiography, TransesophagealEchocardiography, DopplerEchocardiography, Three-DimensionalEchocardiography, StressEchocardiography, Doppler, ColorEchocardiography, Doppler, PulsedMyocytes, CardiacDobutamineVentricular Function, LeftHeart VentriclesVentricular Dysfunction, LeftHeartHeart DiseasesCardiac OutputSensitivity and SpecificityStroke VolumeCardiac CatheterizationCardiac Surgical ProceduresMitral ValveMyocardial ContractionPredictive Value of TestsElectrocardiographyHeart AtriaHeart Defects, CongenitalMitral Valve InsufficiencyHeart NeoplasmsProspective StudiesArrhythmias, CardiacDiastoleHeart Valve DiseasesObserver VariationHeart Septal Defects, AtrialHemodynamicsCardiomyopathiesHeart FailureSystoleCardiotonic AgentsMyocardiumExercise TestFetal HeartReproducibility of ResultsMyocardial InfarctionTime FactorsDeath, Sudden, CardiacCardiac TamponadeCardiac VolumeHypertrophy, Left VentricularVentricular RemodelingFollow-Up StudiesContrast MediaAortic ValveTreatment OutcomeCoronary CirculationRetrospective StudiesCardiac Pacing, ArtificialCardiomegalyMyocardial IschemiaFeasibility StudiesEchocardiography, Four-DimensionalHeart SeptumBlood Flow VelocityHeart Valve ProsthesisPericardial EffusionCardiomyopathy, DilatedEarly DiagnosisPrognosisTricuspid Valve InsufficiencyAortic Valve InsufficiencyAortic Valve StenosisHeart Function TestsHeart RateDelayed DiagnosisTricuspid ValveCardiomyopathy, HypertrophicCoronary DiseasePrenatal DiagnosisCoronary AngiographyMyxomaRisk FactorsVentricular Function, RightMitral Valve StenosisMitral Valve ProlapseDipyridamoleVentricular Dysfunction, RightMagnetic Resonance ImagingUltrasonography, PrenatalAtrial Function, LeftTomography, X-Ray ComputedCardiac Imaging TechniquesBlood PressureSeverity of Illness IndexHeart Valve Prosthesis ImplantationHeart MurmursHeart Septal Defects, VentricularHeart AneurysmVentricular FunctionEmbolismNatriuretic Peptide, BrainRisk Assessment