Aortic Valve StenosisHeart Valve Prosthesis ImplantationAortic ValveHeart Valve ProsthesisCardiac CatheterizationAortic Stenosis, SupravalvularSeverity of Illness IndexBioprosthesisAortic Stenosis, SubvalvularEchocardiography, DopplerAortic Valve InsufficiencyCatheterizationEchocardiographyCarotid StenosisTreatment OutcomeBalloon ValvuloplastyStroke VolumeHemodynamicsAngiodysplasiaEunuchismCalcinosisFollow-Up StudiesProsthesis DesignCoronary StenosisPhonocardiographyAsymptomatic DiseasesVentricular Function, LeftSpinal StenosisVentricular Dysfunction, LeftMultidetector Computed TomographyPulmonary Valve StenosisProspective StudiesTracheal StenosisMitral Valve StenosisHypertrophy, Left VentricularPredictive Value of TestsConstriction, PathologicBlood Flow VelocityPyloric StenosisHeart VentriclesRetrospective StudiesRisk AssessmentRisk FactorsPostoperative ComplicationsKaplan-Meier EstimateTime FactorsMitral Valve InsufficiencyPatient SelectionVentricular RemodelingEchocardiography, TransesophagealPrognosisExercise TestWilliams SyndromeTomography, X-Ray ComputedElectrocardiographyChi-Square DistributionDiscrete Subaortic StenosisFeasibility Studies