Ultrasonography, DopplerUltrasonography, Doppler, ColorDoppler EffectUltrasonography, Doppler, PulsedEchocardiography, Doppler, PulsedUltrasonography, Doppler, TranscranialEchocardiography, Doppler, ColorBlood Flow VelocityLaser-Doppler FlowmetryPulsatile FlowUltrasonography, PrenatalUmbilical ArteriesUltrasonographyRegional Blood FlowDiastolePlacental CirculationMitral ValveSensitivity and SpecificityUltrasonography, Doppler, DuplexProspective StudiesFetal Growth RetardationPregnancyMiddle Cerebral ArteryOphthalmic ArteryReproducibility of ResultsVentricular Function, LeftEchocardiographyCerebrovascular CirculationSystoleVascular ResistanceHemodynamicsObserver VariationCoronary CirculationUterine ArteryRheologyUltrasonicsArteriesPredictive Value of TestsGestational AgeVentricular Dysfunction, LeftFetal HeartCerebral ArteriesEchoencephalographyUterusCardiac CatheterizationStroke VolumeAdnexa UteriBlood PressureFetal DiseasesPregnancy Trimester, SecondTricuspid Valve InsufficiencyContrast MediaHeart Rate, FetalVentricular Function, RightEchocardiography, TransesophagealCardiac OutputImaging, Three-DimensionalFetal MonitoringAngiographyReference ValuesMicrocirculationMyocardial ContractionHeart VentriclesIntracranial EmbolismPre-EclampsiaModels, CardiovascularTricuspid ValveImage EnhancementIntracranial Embolism and ThrombosisAortic Valve StenosisPregnancy Trimester, ThirdArterial Occlusive DiseasesPulmonary ArteryThermodilutionPlacental InsufficiencyMonitoring, IntraoperativeInfant, NewbornFeasibility StudiesEmbolism, AirPregnancy Trimester, FirstHepatic VeinsPregnancy OutcomePortal VeinTime FactorsConstriction, PathologicHyperemiaAdnexal DiseasesCarotid StenosisFetusAtrial Function, LeftHeart RateUltrasonography, InterventionalImage Interpretation, Computer-AssistedROC CurveRenal ArteryCarotid Artery DiseasesAortic ValveVertebral ArteryValsalva ManeuverPhonocardiography