Mesenteric ArteriesMesenteric Artery, SuperiorCatheters, IndwellingMesenteric Artery, InferiorCathetersArteriesMesenteric Vascular OcclusionCeliac ArterySuperior Mesenteric Artery SyndromePulmonary ArteryRenal ArteryCatheterizationFemoral ArteryCerebral ArteriesCarotid ArteriesVasodilationMuscle, Smooth, VascularVasoconstrictionSplanchnic CirculationCatheterization, Central VenousBasilar ArteryMesenteric VeinsBiological FactorsVasoconstrictor AgentsVasodilator AgentsIliac ArterySplenic ArteryEndothelium, VascularHepatic ArteryRadial ArteryNorepinephrineCatheterization, PeripheralCoronary Artery BypassVertebral ArteryCentral Venous CathetersPhenylephrineTreatment OutcomeCardiac CathetersRats, WistarMyographyMammary ArteriesVena Cava, SuperiorAcetylcholineCarotid Artery, InternalSubclavian ArteryTime FactorsAngiographyUrinary CatheterizationTomography, X-Ray ComputedCoronary VesselsRats, Sprague-DawleyDuodenostomyBlood PressureRats, Inbred WKYDose-Response Relationship, DrugMuscle ContractionCarotid Artery DiseasesMuscle RelaxationBrachial ArteryNitric OxideEquipment FailureCarotid Artery, CommonUrinary CathetersSuperior ColliculiDogsEndothelium-Dependent Relaxing FactorsAneurysmRegional Blood FlowStentsConstriction, PathologicEquipment DesignRats, Inbred SHRRenal Artery ObstructionArterial Occlusive DiseasesCatheter-Related InfectionsOphthalmic ArteryPotassium ChlorideRabbitsCharybdotoxinNG-Nitroarginine Methyl Ester15-Hydroxy-11 alpha,9 alpha-(epoxymethano)prosta-5,13-dienoic AcidProspective StudiesUmbilical ArteriesRetrospective StudiesFollow-Up StudiesMiddle Cerebral ArteryAortaUltrasonography, DopplerCoronary AngiographyThoracic ArteriesCardiac CatheterizationBronchial ArteriesVascular ResistanceAorta, ThoracicPopliteal ArteryTemporal ArteriesIndomethacinHypertensionHemodynamicsNitroprusside