Mesenteric ArteriesMesenteric Artery, SuperiorPulmonary EmbolismMesenteric Artery, InferiorEmbolismArteriesEmbolism, FatMechanical ThrombolysisMesenteric Vascular OcclusionFibrinolytic AgentsThrombolytic TherapyIntracranial EmbolismCerebral ArteriesTissue Plasminogen ActivatorCeliac ArteryTreatment OutcomeCerebral RevascularizationPulmonary ArterySuperior Mesenteric Artery SyndromeEmbolism, ParadoxicalBasilar ArteryIntracranial Embolism and ThrombosisCerebral AngiographyFemoral ArteryThrombectomyInfarction, Middle Cerebral ArteryTomography, X-Ray ComputedCarotid Artery ThrombosisStrokeRenal ArteryArterial Occlusive DiseasesCoronary OcclusionAngiographyCarotid ArteriesBrain IschemiaCarotid Artery, InternalEmbolization, TherapeuticStentsEmbolectomyVasodilationMuscle, Smooth, VascularTime FactorsVasoconstrictionSplanchnic CirculationIntracranial ThrombosisEmbolism, Amniotic FluidAcute DiseaseVertebral ArteryMiddle Cerebral ArteryIliac ArteryMagnetic Resonance AngiographyMesenteric VeinsVertebrobasilar InsufficiencyVenous ThrombosisReperfusionUltrasonography, Doppler, TranscranialBiological FactorsVascular PatencyVasoconstrictor AgentsRetrospective StudiesVasodilator AgentsInjections, Intra-ArterialFollow-Up StudiesSplenic ArteryEndovascular ProceduresProspective StudiesIntracranial AneurysmEndothelium, VascularCarotid Artery DiseasesAngioplasty, BalloonConstriction, PathologicCatheterizationCoronary Artery BypassRadial ArteryInfusions, Intra-ArterialCoronary VesselsNorepinephrineHepatic ArteryAnticoagulantsMaxillary ArteryEmbolism, CholesterolPhenylephrineMyographyRats, WistarAneurysmMammary ArteriesAcetylcholineRecurrenceCoronary AngiographySubclavian ArteryThrombosisDuodenostomyVascular Access DevicesBlood PressurePopliteal ArteryPredictive Value of TestsDogsDose-Response Relationship, DrugCerebral InfarctionAngiography, Digital Subtraction