Aortic Valve StenosisAortic ValvePulmonary Valve StenosisHeart Valve Prosthesis ImplantationAortic Valve InsufficiencyHeart Valve ProsthesisHeart Valve DiseasesCatheterizationMitral ValveCalcinosisMitral Valve StenosisCardiac CatheterizationTricuspid Valve StenosisBioprosthesisEchocardiographyPulmonary ValveEchocardiography, DopplerTreatment OutcomeBalloon ValvuloplastySeverity of Illness IndexProsthesis DesignBloodless Medical and Surgical ProceduresAngioplasty, BalloonCarotid StenosisHypoplastic Left Heart SyndromeEchocardiography, TransesophagealHemodynamicsAngiodysplasiaTricuspid ValveEchocardiography, Doppler, ColorFollow-Up StudiesCoronary StenosisBlood Flow VelocityVentricular Function, LeftProspective StudiesVentricular Outflow ObstructionSpinal StenosisTime FactorsBalloon OcclusionMitral Valve InsufficiencyHeart VentriclesTracheal StenosisRetrospective StudiesAortaConstriction, PathologicAortic Valve ProlapseVentricular Dysfunction, LeftRisk FactorsStroke VolumeHeart Defects, CongenitalPredictive Value of TestsObserver VariationRisk AssessmentPulmonary Subvalvular StenosisRheumatic Heart DiseaseEndocarditis, BacterialPyloric StenosisMitral Valve ProlapseDisease ProgressionAngioplasty, Balloon, CoronaryAortic CoarctationIntra-Aortic Balloon PumpingPhonocardiographyInfant, NewbornDiastoleDiscrete Subaortic StenosisHypertrophy, Left VentricularBlood PressureStentsGastric BalloonEchocardiography, Three-DimensionalCardiac Valve AnnuloplastyVenous ValvesReproducibility of ResultsEndocarditisNoonan SyndromeAortic AneurysmAortic Stenosis, SubvalvularPostoperative ComplicationsHeart Septal Defects, VentricularCoronary AngiographyReoperationTomography, X-Ray ComputedFeasibility StudiesTricuspid Valve InsufficiencyThoracotomyMitral Valve Annuloplasty