Aortic Valve StenosisAortic ValveHeart Valve Prosthesis ImplantationAortic Valve InsufficiencyPulmonary Valve StenosisHeart Valve ProsthesisHeart Valve DiseasesMitral ValveCalcinosisMitral Valve StenosisCardiac CatheterizationTricuspid Valve StenosisBioprosthesisCatheterizationEchocardiographyPulmonary ValveEchocardiography, DopplerTreatment OutcomeSeverity of Illness IndexProsthesis DesignBloodless Medical and Surgical ProceduresCarotid StenosisHypoplastic Left Heart SyndromeEchocardiography, TransesophagealBalloon ValvuloplastyAngiodysplasiaTricuspid ValveHemodynamicsEchocardiography, Doppler, ColorFollow-Up StudiesCoronary StenosisBlood Flow VelocityVentricular Function, LeftProspective StudiesVentricular Outflow ObstructionSpinal StenosisMitral Valve InsufficiencyTime FactorsHeart VentriclesRetrospective StudiesTracheal StenosisAortaAortic Valve ProlapseRisk FactorsVentricular Dysfunction, LeftStroke VolumeHeart Defects, CongenitalObserver VariationRisk AssessmentPredictive Value of TestsEndocarditis, BacterialPulmonary Subvalvular StenosisMitral Valve ProlapseConstriction, PathologicRheumatic Heart DiseasePyloric StenosisDisease ProgressionPhonocardiographyDiscrete Subaortic StenosisHypertrophy, Left VentricularInfant, NewbornDiastoleCardiac Valve AnnuloplastyEndocarditisBlood PressureAortic AneurysmEchocardiography, Three-DimensionalVenous ValvesAortic CoarctationReoperationReproducibility of ResultsPostoperative ComplicationsNoonan SyndromeAortic Stenosis, SubvalvularProsthesis FailureHeart Septal Defects, VentricularTricuspid Valve InsufficiencyTomography, X-Ray ComputedThoracotomyMitral Valve AnnuloplastyFeasibility Studies