Umbilical ArteriesSingle Umbilical ArteryUltrasonography, PrenatalUmbilical VeinsUltrasonography, DopplerFetal Growth RetardationArteriesPressurePlacental CirculationPregnancyBlood PressureBlood Flow VelocityHeart Rate, FetalGestational AgePulsatile FlowUltrasonography, Doppler, PulsedUmbilical CordFetal DistressFetal MonitoringPlacental InsufficiencyFetusCerebral ArteriesPulmonary ArteryFetal DiseasesUltrasonography, Doppler, ColorPregnancy OutcomeFetal BloodInfant, NewbornMiddle Cerebral ArteryPregnancy Trimester, ThirdCarotid ArteriesPlacentaFemoral ArteryRenal ArteryHydrostatic PressureMesenteric ArteriesUterine ArteryFetal HypoxiaPregnancy Trimester, SecondHernia, UmbilicalFetal HeartRegional Blood FlowFetofetal TransfusionBasilar ArteryVascular ResistanceProspective StudiesEndothelium, VascularPre-EclampsiaHallermann's SyndromePregnancy, High-RiskInfant, Small for Gestational AgeBlood Pressure DeterminationIliac ArteryHemodynamicsDigestive System AbnormalitiesApgar ScoreFetal DeathRadial ArteryCoronary Artery BypassVertebral ArteryPregnancy Trimester, FirstPlacenta DiseasesMuscle, Smooth, VascularUterusHypertensionMammary ArteriesCarotid Artery, InternalHuman Umbilical Vein Endothelial CellsBrachial ArterySubclavian ArteryTime FactorsFetal WeightDiastoleReference ValuesCardiotocographyCesarean SectionCarotid Artery DiseasesTransducers, PressureMaternal-Fetal ExchangeVasoconstrictionLaser-Doppler FlowmetryBlood CirculationIntracranial PressureVasodilationUmbilicusCoronary VesselsSplenic ArteryIntraocular PressureChorionDihydralazineCarotid Artery, CommonAbnormalities, MultipleAortaUltrasonographyCells, CulturedBlood Pressure Monitoring, AmbulatoryHepatic ArterySensitivity and SpecificityPregnancy Complications, CardiovascularVasoconstrictor Agents