Retinal Artery OcclusionRetinal ArteryRetinal VeinOphthalmic ArteryOphthalmodynamometryArteriesCiliary ArteriesSusac SyndromeFluorescein AngiographyRetinal Vein OcclusionRetinal VesselsUltrasonography, Doppler, ColorArterial Occlusive DiseasesRetinal DiseasesFundus OculiPulmonary ArteryCerebral ArteriesCarotid Artery, InternalBlood Flow VelocityFemoral ArteryCarotid ArteriesRegional Blood FlowCarotid Artery DiseasesRenal ArteryOrbitBasilar ArteryMesenteric ArteriesCoronary OcclusionCarotid Artery, ExternalBlindnessAmaurosis FugaxLaser-Doppler FlowmetryBalloon OcclusionIliac ArteryVertebral ArteryIntraocular PressureVisual AcuityGanglionectomyGlaucoma, NeovascularCoronary Artery BypassEyeOptic DiskRadial ArteryInfarction, Middle Cerebral ArteryBlood PressureSubclavian ArterySneddon SyndromeMammary ArteriesVasodilationCoronary VesselsMyographyParacentesisChoroidTreatment OutcomeCarotid StenosisBrachial ArteryEye DiseasesRetinal NeuronsCarotid Artery, CommonMiddle Cerebral ArteryRetinaEmbolismSplenic ArteryOptic Neuropathy, IschemicHepatic ArteryVasoconstrictionDental OcclusionBrain IschemiaCeliac ArteryEisenmenger ComplexMethyldopaMesenteric Artery, SuperiorRetrospective StudiesVasodilator AgentsFibrinolytic AgentsMuscle, Smooth, VascularEndothelium, VascularCerebral AngiographyProspective StudiesFollow-Up StudiesAngiographyPopliteal ArteryTime FactorsNitroarginineThrombolytic TherapyEmbolization, TherapeuticRenal Artery ObstructionCarotid Artery ThrombosisCoronary AngiographyTemporal ArteriesStentsOphthalmoscopyCoronary DiseaseAcute DiseaseThoracic ArteriesCerebrovascular CirculationConstrictionDogsUlnar ArteryCerebral Infarction