Carotid StenosisEndarterectomy, CarotidCarotid ArteriesCarotid Artery DiseasesCarotid Artery, InternalAortic Valve StenosisCoronary StenosisSpinal StenosisTracheal StenosisConstriction, PathologicUltrasonography, Doppler, DuplexCarotid Artery, CommonPyloric StenosisStentsMitral Valve StenosisPulmonary Valve StenosisEndarterectomyIschemic Attack, TransientAngioplastyStrokeCerebrovascular DisordersCarotid Artery, ExternalMagnetic Resonance AngiographyCarotid BodyAngioplasty, BalloonAngiography, Digital SubtractionUltrasonography, Doppler, TranscranialAngiographyCerebral AngiographyCarotid SinusSeverity of Illness IndexRisk FactorsAmaurosis FugaxTreatment OutcomeFollow-Up StudiesProspective StudiesArterial Occlusive DiseasesBlood Flow VelocityCarotid Artery ThrombosisUltrasonographyIntracranial ArteriosclerosisIntracranial EmbolismUltrasonography, Doppler, ColorPredictive Value of TestsRenal Artery ObstructionRetrospective StudiesTomography, X-Ray ComputedRecurrenceUltrasonography, DopplerAortic Stenosis, SubvalvularSensitivity and SpecificityPostoperative ComplicationsAortic Stenosis, SupravalvularAuscultationBrain IschemiaTime FactorsCerebrovascular CirculationAsymptomatic DiseasesCoronary AngiographyArteriosclerosisRisk AssessmentTunica IntimaHemodynamicsEmbolismLaryngostenosisCarotid Artery InjuriesAortic ValveObserver VariationCalcinosisTricuspid Valve StenosisCatheterizationTunica MediaDoppler EffectCerebral InfarctionDiscrete Subaortic StenosisVertebrobasilar InsufficiencyMiddle Cerebral ArteryCarotid Intima-Media ThicknessRetinal Artery OcclusionCoronary DiseaseReproducibility of ResultsPyloric Stenosis, HypertrophicVascular PatencyPatient SelectionPlaque, AtheroscleroticCranial Nerve InjuriesHeart Valve Prosthesis ImplantationBlood PressureIntracranial Embolism and ThrombosisLife TablesCollateral CirculationMagnetic Resonance ImagingGraft Occlusion, VascularAtherosclerosisEsophageal StenosisCoronary Artery DiseaseContrast MediaAcetazolamideBlood Vessel ProsthesisCoronary Artery Bypass