Carotid StenosisAortic Valve StenosisCarotid Artery, InternalCoronary StenosisCarotid Artery DiseasesSpinal StenosisConstriction, PathologicCarotid Artery, ExternalVertebral ArteryTracheal StenosisIntracranial ArteriosclerosisArterial Occlusive DiseasesCerebral AngiographyPyloric StenosisMitral Valve StenosisPulmonary Valve StenosisVertebrobasilar InsufficiencyMagnetic Resonance AngiographyRetinal Artery OcclusionStentsAngiographyAngiography, Digital SubtractionUltrasonography, Doppler, DuplexEndarterectomy, CarotidCerebral ArteriesAneurysmTomography, X-Ray ComputedCoronary OcclusionCerebrovascular DisordersIschemic Attack, TransientTreatment OutcomeCarotid ArteriesBalloon OcclusionUltrasonography, Doppler, TranscranialCerebrovascular CirculationBrain IschemiaCerebral InfarctionRetinal Vein OcclusionAngioplasty, BalloonStrokeBlood Flow VelocityFollow-Up StudiesRetrospective StudiesUltrasonographyCollateral CirculationCerebral RevascularizationRenal Artery ObstructionCarotid Artery, Internal, DissectionCoronary AngiographyCarotid Artery, CommonGraft Occlusion, VascularTime FactorsCerebral Arterial DiseasesAngioplastyProspective StudiesCarotid Artery ThrombosisAortic Stenosis, SubvalvularDental OcclusionMagnetic Resonance ImagingUltrasonography, Doppler, ColorEndarterectomyAortic Stenosis, SupravalvularEmbolization, TherapeuticAuscultationSeverity of Illness IndexVascular PatencyCoronary DiseaseDoppler EffectIntracranial AneurysmRisk FactorsNeckArteriosclerosisBrain NeoplasmsHemodynamicsBasilar ArteryVertebral Artery DissectionCatheterizationJugular VeinsRecurrenceCoronary CirculationCircle of WillisInfarction, Middle Cerebral ArteryMeningiomaRadiosurgeryIntracranial Embolism and ThrombosisIntracranial EmbolismUltrasonography, DopplerAneurysm, DissectingAortic ValveLaryngostenosisRegional Blood FlowSensitivity and SpecificityPostoperative ComplicationsCoronary VesselsMiddle Cerebral ArteryPredictive Value of TestsTricuspid Valve StenosisMesenteric Vascular OcclusionDiscrete Subaortic StenosisCardiac Catheterization