Mesenteric Vascular OcclusionMesenteric Artery, SuperiorIschemiaMesenteric ArteriesCarotid Artery ThrombosisMesenteric Artery, InferiorPulmonary EmbolismIntestinal DiseasesMesenteryCeliac ArteryForearmPlethysmographyEmbolismThrombosisVascular DiseasesMesenteric VeinsSplanchnic CirculationArteriesRegional Blood FlowEmbolism, FatAngiographyBrain IschemiaVasodilationMyocardial IschemiaVasodilator AgentsReperfusion InjuryEmbolectomyConstriction, PathologicTomography, X-Ray ComputedAngioplasty, BalloonTime FactorsVascular Surgical ProceduresVeinsArterial Occlusive DiseasesTreatment OutcomeIntestinesEndovascular ProceduresPulmonary ArteryVasoconstrictionNitroprussideCerebral ArteriesSuperior Mesenteric Artery SyndromeAbdominal PainIntracranial EmbolismEndothelium, VascularEmbolism, ParadoxicalStentsAcute DiseaseVascular Capacitanceomega-N-MethylarginineRetrospective StudiesVenous ThrombosisChronic DiseaseVascular ResistanceConstrictionFemoral ArteryRenal ArteryBlood PressureRats, WistarVasoconstrictor AgentsVascular PatencyAcetylcholineIntracranial Embolism and ThrombosisRetinal Vein OcclusionCarotid ArteriesBrachial ArteryEndarterectomyUltrasonography, Doppler, DuplexLegBlood Vessel Prosthesis ImplantationIntestine, SmallMuscle, Smooth, VascularIschemic PreconditioningBasilar ArteryRetinal Artery OcclusionHyperemiaHemodynamicsAneurysm, DissectingNitric OxideNorepinephrineRisk FactorsInfusions, Intra-ArterialDigestive System Surgical ProceduresIliac ArteryRats, Sprague-DawleyAngioplastyBlood Flow VelocityEmbolism, Amniotic FluidCarotid Artery, InternalAortic AneurysmInfarction, Middle Cerebral ArteryCoronary OcclusionThrombophlebitisDose-Response Relationship, DrugBalloon OcclusionCapillary ResistanceIschemic Attack, TransientRecurrenceFollow-Up StudiesBiological Factors