Regional Blood FlowBlood Flow VelocityVeinsArteriesSaphenous VeinPortal VeinPulmonary ArteryCerebrovascular CirculationCerebral ArteriesFemoral ArteryCarotid ArteriesVaricose VeinsRenal ArteryFemoral VeinMesenteric ArteriesPulmonary VeinsBasilar ArteryJugular VeinsLaser-Doppler FlowmetryVertebral ArteryIliac ArteryBlood PressureRadial ArteryCoronary Artery BypassMammary ArteriesMesenteric VeinsPulsatile FlowVasodilationRenal VeinsHemodynamicsHepatic ArteryFlow CytometryCarotid Artery, InternalUmbilical VeinsDogsBrachial ArterySubclavian ArteryCarotid Artery DiseasesOphthalmic ArteryMiddle Cerebral ArterySplenic ArteryCarotid Artery, CommonMesenteric Artery, SuperiorVasoconstrictionHepatic VeinsIliac VeinTime FactorsUmbilical ArteriesVascular ResistanceCoronary VesselsVasodilator AgentsUltrasonography, DopplerEndothelium, VascularUltrasonography, Doppler, ColorXenon RadioisotopesCeliac ArteryMicrospheresPopliteal VeinMicrocirculationBronchial ArteriesCerebral VeinsSplenic VeinLiver CirculationRenal Artery ObstructionPulmonary CirculationOxygenMuscle, Smooth, VascularArterial Occlusive DiseasesSplanchnic CirculationRetinal VeinPopliteal ArteryAngiographyTreatment OutcomeThoracic ArteriesTemporal ArteriesCarotid Artery, ExternalRenal CirculationSubclavian VeinHeart RateUterine ArteryLegNitric OxideOxygen ConsumptionHyperemiaCoronary AngiographyBrainRheologyCoronary DiseaseTomography, Emission-ComputedUlnar ArteryVasoconstrictor AgentsMagnetic Resonance AngiographyCarbon DioxideAzygos VeinCoronary CirculationConstriction, PathologicSwineLigationUltrasonography, Doppler, TranscranialModels, Cardiovascular