Mitral Valve StenosisMitral ValveAortic Valve StenosisRheumatic Heart DiseasePulmonary Valve StenosisMitral Valve ProlapseMitral Valve InsufficiencyAortic ValveCatheterizationHeart Valve DiseasesTricuspid Valve StenosisHeart Valve Prosthesis ImplantationMitral Valve AnnuloplastyHeart Valve ProsthesisAortic Valve InsufficiencyPulmonary ValveChordae TendineaeEchocardiographyBioprosthesisTricuspid ValveCarotid StenosisBalloon ValvuloplastyCardiac CatheterizationCalcinosisEchocardiography, TransesophagealEchocardiography, DopplerTreatment OutcomeEchocardiography, Three-DimensionalCoronary StenosisPhonocardiographySpinal StenosisEchocardiography, Doppler, ColorTracheal StenosisFollow-Up StudiesSeverity of Illness IndexCardiac Surgical ProceduresHemodynamicsProsthesis DesignPulmonary Subvalvular StenosisCardiac Valve AnnuloplastyHeart Defects, CongenitalPyloric StenosisConstriction, PathologicHeart VentriclesVentricular Outflow ObstructionRetrospective StudiesTricuspid Valve InsufficiencyEndocarditis, BacterialTime FactorsEndocarditisHeart AuscultationProspective StudiesDiscrete Subaortic StenosisBlood Flow VelocityReoperationVentricular Function, LeftVenous ValvesPostoperative ComplicationsThoracotomyNoonan SyndromeHypoplastic Left Heart SyndromeAortic CoarctationHeart Septal Defects, VentricularPredictive Value of TestsBloodless Medical and Surgical ProceduresProlapseRisk FactorsAortic Stenosis, SubvalvularStroke VolumeHeart AtriaObserver VariationSuture TechniquesMyxomaFeasibility Studies