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 VolumeBradycardiaEchocardiographyPregnancy OutcomeFetal DevelopmentAbortion, ThreatenedPrenatal DiagnosisMaternal-Fetal ExchangeSheepBlood Flow VelocityHeart AtriaMyocytes, CardiacApgar ScoreEchocardiography, Doppler, ColorFetal Growth RetardationProspective StudiesInfant, NewbornMyocardial ContractionHemodynamicsPerinatologyCrown-Rump LengthElectronics, MedicalPregnancy ComplicationsHeart SeptumAnalgesia, ObstetricalPregnancy, High-RiskPlacental CirculationAnesthesia, ObstetricalTime FactorsCardiomegalySensitivity and SpecificityReproducibility of ResultsHeart AuscultationTocolytic AgentsHeart Arrest, InducedHeart Function TestsDown SyndromeUmbilical CordFeasibility StudiesSheep, DomesticCesarean SectionSufentanilUltrasonography, Doppler, ColorUltrasonographyMyocardial IschemiaTachycardiaEmbryonic and Fetal DevelopmentReference ValuesHeart VentriclesData DisplayAnesthesia, EpiduralFetal DeathRisk FactorsObstetricsPregnancy in DiabeticsEchocardiography, DopplerImage Processing, Computer-AssistedPrinciple-Based EthicsMeconiumCoronary DiseaseDelivery, ObstetricObstetric Labor ComplicationsVascular MalformationsChromosome DisordersNuchal Translucency MeasurementHydrops FetalisFetal WeightAlgorithmsRNA, Messenger