Retinal Artery OcclusionRetinal ArteryRetinal VeinOphthalmic ArteryIschemiaOphthalmodynamometryArteriesCiliary ArteriesSusac SyndromeMyocardial IschemiaBrain IschemiaFluorescein AngiographyRetinal VesselsUltrasonography, Doppler, ColorRetinal DiseasesFundus OculiPulmonary ArteryRetinal Vein OcclusionRegional Blood FlowBlood Flow VelocityCerebral ArteriesCarotid ArteriesFemoral ArteryOrbitRenal ArteryArterial Occlusive DiseasesMesenteric ArteriesCarotid Artery DiseasesCarotid Artery, InternalLaser-Doppler FlowmetryReperfusion InjuryBasilar ArteryBlindnessAmaurosis FugaxCarotid Artery, ExternalIntraocular PressureIliac ArteryGlaucoma, NeovascularGanglionectomyCoronary Artery BypassVertebral ArteryVisual AcuityOptic DiskEyeBlood PressureRadial ArteryMammary ArteriesSneddon SyndromeVasodilationSubclavian ArteryMyographyIschemic Attack, TransientMyocardial Reperfusion InjuryCoronary VesselsParacentesisRetinal NeuronsChoroidOptic Neuropathy, IschemicRetinaBrachial ArteryEye DiseasesTime FactorsVasodilator AgentsMesenteric Artery, SuperiorSplenic ArteryInfarction, Middle Cerebral ArteryVasoconstrictionHepatic ArteryEmbolismEndothelium, VascularCarotid Artery, CommonMethyldopaEisenmenger ComplexCeliac ArteryMiddle Cerebral ArteryMuscle, Smooth, VascularProspective StudiesWarm IschemiaReperfusionNitroarginineCoronary DiseaseRetrospective StudiesCarotid StenosisDisease Models, AnimalRats, Sprague-DawleyPopliteal ArteryRats, WistarAcute DiseaseCoronary CirculationFibrinolytic AgentsFollow-Up StudiesRenal Artery ObstructionCoronary AngiographyOphthalmoscopyCerebrovascular CirculationUmbilical ArteriesThoracic ArteriesMyocardiumTemporal ArteriesGlaucoma, Open-Angle