Intestinal ObstructionAirway ObstructionCarotid StenosisAortic Valve StenosisUreteral ObstructionCoronary StenosisSpinal StenosisTracheal StenosisConstriction, PathologicPyloric StenosisPulmonary Valve StenosisMitral Valve StenosisDuodenal ObstructionUrinary Bladder Neck ObstructionUrethral ObstructionNasal ObstructionGastric Outlet ObstructionVentricular Outflow ObstructionStentsAortic Stenosis, SubvalvularLacrimal Duct ObstructionRenal Artery ObstructionTreatment OutcomeAortic Stenosis, SupravalvularCoronary AngiographyLaryngostenosisAngioplasty, BalloonUltrasonography, Doppler, DuplexCarotid Artery, InternalAortic ValveFollow-Up StudiesTomography, X-Ray ComputedEndarterectomy, CarotidCatheterizationSeverity of Illness IndexArterial Occlusive DiseasesTricuspid Valve StenosisDiscrete Subaortic StenosisEsophageal StenosisAngiographyRetrospective StudiesMagnetic Resonance AngiographyHydronephrosisCholestasisPyloric Stenosis, HypertrophicProspective StudiesCholestasis, ExtrahepaticBlood Flow VelocityPostoperative ComplicationsHeart Valve Prosthesis ImplantationBronchial DiseasesCardiac CatheterizationAngiography, Digital SubtractionEchocardiographyTime FactorsSensitivity and SpecificityPredictive Value of TestsCoronary CirculationBezoarsGraft Occlusion, VascularPulmonary Veno-Occlusive DiseaseHemodynamicsAngioplastyRecurrenceIleal DiseasesCoronary DiseaseIntracranial ArteriosclerosisLung Diseases, ObstructiveHeart Valve ProsthesisCoronary VesselsJejunal DiseasesVascular PatencyCalcinosisUltrasonography, Doppler, ColorCarotid Artery DiseasesVertebrobasilar InsufficiencyNasolacrimal DuctForced Expiratory VolumeCerebral AngiographyFractional Flow Reserve, MyocardialEchocardiography, DopplerColonic DiseasesCardiomyopathy, HypertrophicCarotid ArteriesSpirometryReoperationTissue AdhesionsDecompression, SurgicalArteriovenous Shunt, SurgicalPulmonary Subvalvular StenosisRenal ArteryCoronary Artery DiseaseAnastomosis, SurgicalEndoscopyBronchoscopyRisk FactorsSuperior Vena Cava SyndromeIschemic Attack, TransientKidney PelvisHypertension, Renovascular