Aortic Valve StenosisAortic ValveHeart Valve Prosthesis ImplantationAortic Valve InsufficiencyPulmonary Valve StenosisHeart Valve ProsthesisHeart Valve DiseasesCalcinosisMitral ValveMitral Valve StenosisTricuspid Valve StenosisCardiac CatheterizationBioprosthesisCatheterizationEchocardiographyPulmonary ValveEchocardiography, DopplerSeverity of Illness IndexTreatment OutcomeProsthesis DesignBloodless Medical and Surgical ProceduresCarotid StenosisHypoplastic Left Heart SyndromeBalloon ValvuloplastyEchocardiography, TransesophagealAngiodysplasiaHemodynamicsTricuspid ValveEchocardiography, Doppler, ColorCoronary StenosisBlood Flow VelocityFollow-Up StudiesVentricular Function, LeftVentricular Outflow ObstructionSpinal StenosisProspective StudiesMitral Valve InsufficiencyHeart VentriclesTracheal StenosisTime FactorsAortaRetrospective StudiesAortic Valve ProlapseVentricular Dysfunction, LeftStroke VolumeRisk FactorsHeart Defects, CongenitalObserver VariationPulmonary Subvalvular StenosisPredictive Value of TestsRisk AssessmentEndocarditis, BacterialMitral Valve ProlapseConstriction, PathologicPyloric StenosisDisease ProgressionRheumatic Heart DiseasePhonocardiographyDiscrete Subaortic StenosisDiastoleHypertrophy, Left VentricularInfant, NewbornCardiac Valve AnnuloplastyVenous ValvesBlood PressureEchocardiography, Three-DimensionalAortic CoarctationEndocarditisReproducibility of ResultsAortic AneurysmNoonan Syndrome