Spinal CordCarotid StenosisAortic Valve StenosisSpinal Cord InjuriesSpinal StenosisInjectionsCoronary StenosisTracheal StenosisPyloric StenosisMitral Valve StenosisConstriction, PathologicPulmonary Valve StenosisInjections, SpinalSpinal CanalSpinal NervesSpinal Cord DiseasesSpinal Nerve RootsAnesthesia, SpinalSpinal Cord CompressionSpinal DiseasesSpinal Cord NeoplasmsSpinal NeoplasmsInjections, IntravenousSpinal FusionRenal Artery ObstructionInjections, IntramuscularAortic Stenosis, SubvalvularTreatment OutcomeAortic Stenosis, SupravalvularTime FactorsStentsCoronary AngiographyCarotid Artery, InternalLumbar VertebraeEndarterectomy, CarotidInjections, SubcutaneousUltrasonography, Doppler, DuplexInjections, IntralesionalAngioplasty, BalloonLaminectomySpinal InjuriesInjections, Intra-ArticularLaryngostenosisAortic ValveMuscular Atrophy, SpinalInjections, EpiduralAngiographyRats, Sprague-DawleyTricuspid Valve StenosisSeverity of Illness IndexMagnetic Resonance AngiographyGanglia, SpinalDiscrete Subaortic StenosisFollow-Up StudiesSpinal Cord IschemiaCatheterizationTomography, X-Ray ComputedProspective StudiesArterial Occlusive DiseasesLumbosacral RegionInjections, IntraperitonealRetrospective StudiesBlood Flow VelocityDisease Models, AnimalPyloric Stenosis, HypertrophicMotor NeuronsAngiography, Digital SubtractionCervical VertebraeSpineDecompression, SurgicalThoracic VertebraeHeart Valve Prosthesis ImplantationParaplegiaEsophageal StenosisSensitivity and SpecificityMagnetic Resonance ImagingHemodynamicsInjections, IntraventricularCoronary CirculationCardiac CatheterizationTuberculosis, SpinalAngioplastyCoronary DiseaseIntracranial ArteriosclerosisPainGraft Occlusion, VascularInjections, Intra-ArterialPostoperative ComplicationsInjections, IntradermalPredictive Value of TestsPosterior Horn CellsPain MeasurementCoronary VesselsSpinal CurvaturesEchocardiographyHematoma, Epidural, SpinalRecurrenceCerebral AngiographyVertebrobasilar InsufficiencyRisk Factors