Intestinal VolvulusDigestive System AbnormalitiesTorsion AbnormalityIntestinal ObstructionMesenteric ArteriesCecal DiseasesMesenteric Artery, SuperiorIntestinal DiseasesDigestive System Surgical ProceduresAbdominal PainIntestinesMesenteric Artery, InferiorInfant, NewbornArteriesDuodenal ObstructionSitus InversusIntestinal AtresiaIntestinal Pseudo-ObstructionDuodenal DiseasesPostoperative ComplicationsMesenteric Vascular OcclusionCeliac ArterySuperior Mesenteric Artery SyndromePulmonary ArteryRenal ArteryVomitingTomography, X-Ray ComputedTreatment OutcomeRetrospective StudiesFemoral ArteryCerebral ArteriesVasodilationCarotid ArteriesMuscle, Smooth, VascularIntestine, SmallVasoconstrictionAbnormalities, MultipleSplanchnic CirculationLaparoscopyBasilar ArterySyndromeMesenteric VeinsBiological FactorsVasoconstrictor AgentsIliac ArteryVasodilator AgentsDuodenumSplenic ArteryEndothelium, VascularHepatic ArteryCoronary Artery BypassVertebral ArteryNorepinephrineTime FactorsRotationRadial ArteryPhenylephrineMyographyRats, WistarMammary ArteriesCarotid Artery, InternalSubclavian ArteryAngiographyAcetylcholineDuodenostomyIntraoperative ComplicationsCarotid Artery DiseasesRats, Sprague-DawleyRats, Inbred WKYCoronary VesselsFollow-Up StudiesBlood PressureDose-Response Relationship, DrugMuscle ContractionMuscle RelaxationStentsBrachial ArteryNitric OxideVena Cava, SuperiorAneurysmSuperior ColliculiProspective StudiesCarotid Artery, CommonConstriction, PathologicEndothelium-Dependent Relaxing FactorsArterial Occlusive Diseases