EchocardiographyEchocardiography, DopplerEchocardiography, Doppler, PulsedVentricular Dysfunction, LeftVentricular Dysfunction, RightDiastoleSystoleVentricular Function, LeftEchocardiography, TransesophagealEchocardiography, Three-DimensionalEchocardiography, StressEchocardiography, Doppler, ColorDobutamineMitral ValveHeart VentriclesStroke VolumeMitral Valve InsufficiencyHeart DiseasesSensitivity and SpecificityHeart AtriaHeart Septal Defects, AtrialPredictive Value of TestsObserver VariationHeart Valve DiseasesCardiac CatheterizationElectrocardiographyHeart Defects, CongenitalExercise TestHeart NeoplasmsMyocardial ContractionProspective StudiesAortic ValveContrast MediaCardiotonic AgentsFeasibility StudiesReproducibility of ResultsFetal HeartEchocardiography, Four-DimensionalHypertrophy, Left VentricularHemodynamicsBlood Flow VelocityHeart SeptumCoronary CirculationHeart Valve ProsthesisTricuspid Valve InsufficiencyAortic Valve InsufficiencyHeartAortic Valve StenosisTricuspid ValveMyocardial InfarctionCardiomyopathiesHeart FailureMitral Valve StenosisMitral Valve ProlapseFollow-Up StudiesAtrial Function, LeftCardiac VolumeDipyridamoleTreatment OutcomeVentricular RemodelingMyocardial IschemiaVentricular Function, RightTime FactorsPericardial EffusionCoronary AngiographyCoronary DiseaseHeart Valve Prosthesis ImplantationCardiomyopathy, HypertrophicMyocardiumHeart MurmursCardiac Surgical ProceduresCardiomyopathy, DilatedEmbolismHeart Septal Defects, VentricularMyxomaHeart AneurysmAtrial AppendageFluorocarbonsHypertension, PulmonaryPrognosisSeverity of Illness IndexHeart Function TestsUltrasonography, PrenatalMagnetic Resonance ImagingPulmonary ArteryTomography, Emission-Computed, Single-PhotonEndocarditisImage Interpretation, Computer-AssistedRetrospective StudiesForamen Ovale, PatentThrombosisMyocardial StunningVentricular DysfunctionNatriuretic Peptide, BrainAtrial FibrillationIntraoperative CarePhonocardiographyChordae TendineaeTomography, X-Ray ComputedImage Enhancement