Echocardiography, Doppler, ColorEchocardiography, DopplerBlood Flow VelocityMitral Valve InsufficiencyUltrasonography, Doppler, ColorEchocardiographyUltrasonography, DopplerEchocardiography, Doppler, PulsedColorEchocardiography, TransesophagealDoppler EffectEchocardiography, Three-DimensionalDiastoleUltrasonography, Doppler, PulsedMitral ValveVentricular Function, LeftEchocardiography, StressVentricular Dysfunction, LeftSystoleUltrasonography, Doppler, TranscranialStroke VolumeTricuspid Valve InsufficiencyCoronary CirculationHeart VentriclesUltrasonography, PrenatalSensitivity and SpecificityCardiac CatheterizationColor PerceptionHemodynamicsObserver VariationProspective StudiesDobutaminePredictive Value of TestsReproducibility of ResultsFetal HeartTricuspid ValveAortic Valve StenosisMyocardial ContractionVentricular Function, RightAortic ValvePulsatile FlowAortic Valve InsufficiencyHeart MurmursAtrial Function, LeftHeart Valve DiseasesCardiac OutputRegional Blood FlowPhonocardiographyPulmonary ArteryHeart AtriaHypertension, PulmonaryHeart DiseasesContrast MediaOphthalmic ArteryHeart Septal Defects, AtrialHeart Defects, CongenitalLaser-Doppler FlowmetryHeart Septal Defects, VentricularPulmonary Wedge PressureFeasibility StudiesElectrocardiographyBlood PressureExercise TestColor VisionPregnancyThermodilutionCardiomyopathy, HypertrophicHeart SeptumHeart Valve ProsthesisVentricular PressureVentricular Dysfunction, RightVentricular DysfunctionHeart FailureHeartFetal DiseasesHeart Function TestsCardiac VolumeVascular ResistanceMitral Valve StenosisColor Perception TestsFollow-Up StudiesUltrasonographyPulmonary VeinsEchocardiography, Four-DimensionalTime FactorsAtrial Function, RightUmbilical ArteriesVentricular FunctionImage EnhancementPulmonary CirculationCardiomyopathiesSeverity of Illness IndexHeart RateGestational AgeCardiomyopathy, DilatedDuctus Arteriosus, PatentHypertrophy, Left VentricularPulmonary Valve InsufficiencyCoronary VesselsRheology