Renal ArteryNephronsRenal Artery ObstructionArteriesBlood Flow VelocityHypertension, RenovascularCerebral ArteriesFemoral ArteryRegional Blood FlowMiddle Cerebral ArteryPulmonary ArteryMesenteric Artery, SuperiorKidneyCarotid ArteriesBlood PressureOphthalmic ArteryUltrasonography, DopplerMesenteric ArteriesUmbilical ArteriesPulsatile FlowUltrasonography, Doppler, ColorAngiographyUltrasonography, Doppler, PulsedIliac ArteryBronchial ArteriesRadial ArteryRenal VeinsRenal CirculationKidney Tubules, DistalHypertension, RenalCarotid Artery, InternalCerebrovascular CirculationBasilar ArteryBrachial ArteryHemodynamicsVascular ResistanceAngioplasty, BalloonUltrasonography, Doppler, TranscranialUterusStentsAneurysmAorta, AbdominalDogsCeliac ArteryKidney TubulesUterine ArteryVasoconstrictionNephrectomyVertebral ArteryCoronary Artery BypassVasodilationCoronary VesselsUltrasonography, Doppler, DuplexGlomerular Filtration RateCarotid Artery, CommonTime FactorsMammary ArteriesTreatment OutcomeFetal Growth RetardationSplenic ArteryAngioplastyUltrasonographySubclavian ArteryHepatic ArteryPregnancyCarotid Artery, ExternalHeart RateVasodilator AgentsCarotid Artery DiseasesMagnetic Resonance AngiographyKidney GlomerulusSplanchnic CirculationTomography, X-Ray ComputedCircle of WillisLaser-Doppler FlowmetryKidney Tubules, ProximalRadioisotope RenographyUltrasonography, PrenatalAortographyAngiography, Digital SubtractionVasoconstrictor AgentsLoop of HenleCoronary CirculationBlood Vessel Prosthesis ImplantationAortic Aneurysm, AbdominalIodohippuric AcidRats, Sprague-DawleyProspective StudiesVascular Surgical ProceduresHypocapniaMephentermineKidney Tubules, CollectingReninHypertensionCardiac OutputArteriosclerosisArterial Occlusive DiseasesUreterFollow-Up StudiesMuscle, Smooth, Vascular