Fetal HeartHeart Rate, FetalHeartFetal MonitoringCardiotocographyHeart RateUltrasonography, PrenatalHeart Defects, CongenitalPregnancyEchocardiography, Four-DimensionalFetal MovementGestational AgeFetal DiseasesFetal DistressFetal HypoxiaUmbilical ArteriesFetusHeart FailureHeart BlockCanrenoic AcidPregnancy Trimester, SecondEchocardiography, Three-DimensionalHeart DiseasesMagnetocardiographyUltrasonography, DopplerHeart TransplantationPregnancy Trimester, ThirdHeart ValvesPregnancy Trimester, FirstLabor, ObstetricMyocardiumCardiac VolumeBradycardiaPregnancy OutcomeEchocardiographyFetal DevelopmentAbortion, ThreatenedPrenatal DiagnosisMaternal-Fetal ExchangeSheepBlood Flow VelocityHeart AtriaApgar ScoreMyocytes, CardiacEchocardiography, Doppler, ColorFetal Growth RetardationProspective StudiesMyocardial ContractionHemodynamicsInfant, NewbornPerinatologyCrown-Rump LengthElectronics, MedicalHeart SeptumPregnancy ComplicationsAnalgesia, ObstetricalPregnancy, High-RiskPlacental CirculationAnesthesia, ObstetricalCardiomegalyHeart AuscultationTocolytic AgentsHeart Arrest, InducedHeart Function TestsUmbilical CordSheep, DomesticCesarean SectionDown SyndromeSufentanilSensitivity and SpecificityUltrasonography, Doppler, ColorTime FactorsFeasibility StudiesTachycardiaMyocardial IschemiaEmbryonic and Fetal DevelopmentReproducibility of ResultsUltrasonographyHeart VentriclesAnesthesia, EpiduralFetal DeathReference ValuesPregnancy in DiabeticsObstetricsData DisplayEchocardiography, DopplerMeconiumRisk FactorsDelivery, ObstetricCoronary DiseaseObstetric Labor ComplicationsVascular MalformationsChromosome DisordersNuchal Translucency MeasurementHydrops FetalisFetal WeightImage Processing, Computer-AssistedCardiac Output, LowVentricular Function, LeftSystole