Fetal HeartHeart Defects, CongenitalHeart Rate, FetalHeartHeart RateFetal MonitoringCardiotocographyUltrasonography, PrenatalPregnancyHeart FailureEchocardiography, Four-DimensionalFetal DiseasesHeart BlockHeart DiseasesCyanosisGestational AgeInfant, NewbornHeart TransplantationFetal MovementHeart ValvesPrenatal DiagnosisHeart Septal DefectsFetal DistressFetal HypoxiaUmbilical ArteriesEchocardiographyMyocardiumFetusHeart Septal Defects, VentricularEchocardiography, Three-DimensionalHeart AtriaPregnancy Trimester, SecondCardiac Surgical ProceduresTetralogy of FallotRetrospective StudiesProspective StudiesSensitivity and SpecificityPregnancy Trimester, FirstHeart Septal Defects, AtrialTime FactorsRisk FactorsCanrenoic AcidUltrasonography, DopplerPregnancy Trimester, ThirdHemodynamicsPregnancy OutcomeMyocytes, CardiacDown SyndromeMagnetocardiographyAbnormalities, MultipleHeart Arrest, InducedCardiac VolumeHeterotaxy SyndromeMyocardial ContractionHeart Function TestsFollow-Up StudiesTreatment OutcomeBradycardiaHeart SeptumLabor, ObstetricPredictive Value of TestsTransposition of Great VesselsReproducibility of ResultsBlood Flow VelocityEchocardiography, Doppler, ColorMaternal-Fetal ExchangeEarly DiagnosisHypoplastic Left Heart SyndromeDelayed DiagnosisEisenmenger ComplexFetal DevelopmentCardiomegalyPulmonary ArteryCardiac CatheterizationCardiomyopathiesSheepMyocardial IschemiaPregnancy ComplicationsHeart VentriclesPrognosisNeonatal ScreeningCohort StudiesEndocardial Cushion DefectsRheumatic Heart DiseaseCardiomyopathy, DilatedAbortion, ThreatenedDuctus Arteriosus, PatentEchocardiography, DopplerCoronary DiseaseFetal DeathTachycardiaCardiovascular AbnormalitiesAge FactorsStroke VolumeSyndromeVentricular Function, LeftReference ValuesCardiologyPregnancy, High-RiskPulmonary Circulation