Aortic Valve StenosisSyncopeHeart Valve Prosthesis ImplantationAortic ValveSyncope, VasovagalHeart Valve ProsthesisCardiac CatheterizationAortic Stenosis, SupravalvularSeverity of Illness IndexBioprosthesisAortic Stenosis, SubvalvularEchocardiography, DopplerAortic Valve InsufficiencyCatheterizationEchocardiographyTreatment OutcomeCarotid StenosisBalloon ValvuloplastyStroke VolumeHemodynamicsAngiodysplasiaFollow-Up StudiesEunuchismCalcinosisProsthesis DesignCoronary StenosisPhonocardiographyVentricular Function, LeftAsymptomatic DiseasesProspective StudiesVentricular Dysfunction, LeftSpinal StenosisMultidetector Computed TomographyPulmonary Valve StenosisTracheal StenosisMitral Valve StenosisPredictive Value of TestsElectrocardiographyHypertrophy, Left VentricularBlood Flow VelocityRetrospective StudiesConstriction, PathologicHeart VentriclesRisk FactorsRisk AssessmentPyloric StenosisTime FactorsKaplan-Meier EstimatePostoperative ComplicationsMitral Valve InsufficiencyPatient SelectionPrognosisExercise TestVentricular RemodelingEchocardiography, TransesophagealBlood PressureWilliams SyndromeTomography, X-Ray ComputedChi-Square DistributionFeasibility StudiesDiscrete Subaortic StenosisSurvival AnalysisRecurrenceMultivariate AnalysisTricuspid Valve StenosisBradycardiaHeart Valve DiseasesFemoral ArteryCoronary AngiographyAge FactorsProsthesis FailureStrokeRenal Artery ObstructionStentsHeart MurmursRegistriesCohort StudiesProportional Hazards ModelsEndocardial FibroelastosisSurvival RateAngiographyAngioplasty, BalloonSensitivity and SpecificitySystoleMidodrineLogistic ModelsMitral ValvePacemaker, ArtificialCarotid Artery, InternalCoronary CirculationModels, CardiovascularEndarterectomy, CarotidArterial Occlusive DiseasesDeath, SuddenElastinCardiomyopathy, HypertrophicUltrasonography, Doppler, DuplexMagnetic Resonance AngiographyHeart RateLaryngostenosis