Umbilical ArteriesSingle Umbilical ArteryUltrasonography, PrenatalUmbilical VeinsUltrasonography, DopplerFetal Growth RetardationPlacental CirculationArteriesPregnancyHeart Rate, FetalBlood Flow VelocityGestational AgeUltrasonography, Doppler, PulsedUmbilical CordFetal DistressPulsatile FlowFetal MonitoringPlacental InsufficiencyFetusCerebral ArteriesFetal DiseasesUltrasonography, Doppler, ColorPulmonary ArteryPregnancy 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 DeathIliac ArteryRegional Blood FlowProspective StudiesVertebral ArteryCoronary Artery BypassPregnancy Trimester, FirstPlacenta DiseasesRadial ArteryUterusMammary ArteriesVascular ResistanceMuscle, Smooth, VascularHuman Umbilical Vein Endothelial CellsCarotid Artery, InternalSubclavian ArteryCardiotocographyFetal WeightCesarean SectionMaternal-Fetal ExchangeCarotid Artery DiseasesUmbilicusChorionSplenic ArteryBrachial ArteryAbnormalities, MultipleDihydralazinePregnancy, ProlongedHepatic ArteryCarotid Artery, CommonUltrasonographyCardiovascular AbnormalitiesLaser-Doppler FlowmetryCoronary VesselsFetal MovementCells, CulturedReference ValuesEndothelial CellsOligohydramniosBlood CirculationPrenatal DiagnosisVasoconstrictionDuctus ArteriosusBirth WeightPregnancy Complications, CardiovascularVasodilationCeliac ArterySensitivity and SpecificityHSP20 Heat-Shock ProteinsOphthalmic ArteryMesenteric Artery, SuperiorAnesthesia, ObstetricalSerotonin