Umbilical ArteriesSingle Umbilical ArteryUltrasonography, PrenatalUmbilical VeinsUltrasonography, DopplerFetal Growth RetardationPlacental CirculationArteriesPregnancyHeart Rate, FetalBlood Flow VelocityGestational AgeUltrasonography, Doppler, PulsedUmbilical CordFetal DistressPulsatile FlowFetal MonitoringPlacental InsufficiencyFetusCerebral ArteriesFetal DiseasesPulmonary ArteryUltrasonography, Doppler, ColorPregnancy OutcomeFetal BloodInfant, NewbornPregnancy Trimester, ThirdMiddle Cerebral ArteryCarotid ArteriesPlacentaFemoral ArteryUterine ArteryRenal ArteryPregnancy Trimester, SecondFetal HypoxiaHernia, UmbilicalMesenteric ArteriesFetofetal TransfusionFetal HeartBasilar ArteryHallermann's SyndromePre-EclampsiaEndothelium, VascularPregnancy, High-RiskInfant, Small for Gestational AgeDigestive System AbnormalitiesApgar ScoreFetal DeathProspective StudiesIliac ArteryRegional Blood FlowVertebral ArteryCoronary Artery BypassPregnancy Trimester, FirstPlacenta DiseasesUterusRadial ArteryMammary ArteriesVascular ResistanceMuscle, Smooth, VascularHuman Umbilical Vein Endothelial CellsCarotid Artery, InternalSubclavian ArteryCardiotocographyFetal WeightCesarean SectionMaternal-Fetal ExchangeCarotid Artery DiseasesUmbilicusChorionAbnormalities, MultipleSplenic ArteryBrachial ArteryDihydralazinePregnancy, ProlongedCells, CulturedHepatic ArteryCarotid Artery, CommonUltrasonographyCardiovascular AbnormalitiesCoronary VesselsLaser-Doppler FlowmetryFetal MovementReference ValuesEndothelial CellsOligohydramniosBlood CirculationPrenatal DiagnosisPregnancy Complications, CardiovascularVasoconstrictionDuctus ArteriosusBirth WeightSensitivity and SpecificityVasodilationCeliac ArteryHSP20 Heat-Shock ProteinsOphthalmic ArteryMesenteric Artery, SuperiorAnesthesia, ObstetricalSerotonin