Spinal StenosisLumbar VertebraeCarotid StenosisAortic Valve StenosisDecompression, SurgicalSpinal CordSpinal CanalLaminectomyCoronary StenosisTracheal StenosisSpondylolisthesisInjections, EpiduralPyloric StenosisMitral Valve StenosisRadiculopathySpinal Cord InjuriesConstriction, PathologicPulmonary Valve StenosisLigamentum FlavumSpinal FusionLumbosacral RegionIntervertebral Disc DisplacementSpinal DiseasesSciaticaTreatment OutcomeSpinal Nerve RootsSpinal Cord CompressionPolyradiculopathyMyelographyLow Back PainIntermittent ClaudicationSpondylosisPain MeasurementDisability EvaluationRenal Artery ObstructionFollow-Up StudiesCervical VertebraeAortic Stenosis, SubvalvularBack PainMagnetic Resonance ImagingProspective StudiesAortic Stenosis, SupravalvularSeverity of Illness IndexInjections, SpinalSteroidsOrthopedic ProceduresAnesthetics, LocalFailed Back Surgery SyndromeRetrospective StudiesNeurosurgical ProceduresStentsSacrumTomography, X-Ray ComputedCoronary AngiographyCauda EquinaCarotid Artery, InternalEpidural SpaceProstheses and ImplantsEndarterectomy, CarotidAngioplasty, BalloonUltrasonography, Doppler, DuplexLaryngostenosisPostoperative ComplicationsAortic ValveTissue AdhesionsSpineTricuspid Valve StenosisSpinal Cord DiseasesSurgical Procedures, Minimally InvasiveFluoroscopySpinal NervesDiscrete Subaortic StenosisDura MaterAngiographyMagnetic Resonance AngiographyAnesthesia, SpinalTime FactorsPredictive Value of TestsArterial Occlusive DiseasesPyloric Stenosis, HypertrophicBlood Flow VelocityChronic PainCatheterizationInternal FixatorsSaline Solution, Hypertonic