Fetal HeartEchocardiographyUltrasonography, PrenatalHeart Defects, CongenitalEchocardiography, Four-DimensionalEchocardiography, Three-DimensionalFetal DiseasesEchocardiography, Doppler, ColorEchocardiography, DopplerEchocardiography, TransesophagealPregnancyGestational AgeCardiotocographyPregnancy Trimester, SecondEchocardiography, StressNuchal Translucency MeasurementPregnancy Trimester, FirstAortic Arch SyndromesSingle Umbilical ArteryPulmonary AtresiaCardiac VolumePregnancy OutcomeTricuspid Valve InsufficiencyHeart Rate, FetalSensitivity and SpecificityPrenatal DiagnosisPregnancy, High-RiskEchocardiography, Doppler, PulsedFeasibility StudiesCrown-Rump LengthDobutamineDuctus ArteriosusHypoplastic Left Heart SyndromeFetofetal TransfusionInfant, NewbornProspective StudiesVentricular Function, LeftBlood Flow VelocityVentricular Dysfunction, LeftRetrospective StudiesPregnancy Complications, CardiovascularMitral ValveImage Interpretation, Computer-AssistedHeart VentriclesStroke VolumeReproducibility of ResultsHeart BlockNeckMitral Valve InsufficiencyNeonatal ScreeningHeart DiseasesEarly DiagnosisHeart AtriaHeart Septal Defects, AtrialKaryotypingHeart Valve DiseasesDiastoleImage Processing, Computer-AssistedObserver VariationFollow-Up StudiesPredictive Value of TestsSystoleCardiac CatheterizationHeart NeoplasmsElectrocardiographyExercise TestMyocardial ContractionAortic ValveCardiotonic AgentsContrast MediaHypertrophy, Left VentricularHeart SeptumHemodynamicsCoronary CirculationHeart Valve ProsthesisAortic Valve InsufficiencyTricuspid ValveHeartAortic Valve StenosisMitral Valve ProlapseCardiomyopathiesMitral Valve StenosisHeart FailureMyocardial InfarctionAtrial Function, LeftDipyridamoleIncidenceVentricular RemodelingMyocardial IschemiaVentricular Function, RightPericardial EffusionVentricular Dysfunction, RightCoronary AngiographyCoronary DiseaseHeart Valve Prosthesis ImplantationCardiomyopathy, HypertrophicHeart MurmursMyocardiumHeart Septal Defects, VentricularMyxoma