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, DopplerEchocardiography, TransesophagealEchocardiography, Three-DimensionalCoronary StenosisTreatment OutcomePhonocardiographySpinal StenosisEchocardiography, Doppler, ColorTracheal StenosisSeverity of Illness IndexFollow-Up StudiesHemodynamicsCardiac Surgical ProceduresProsthesis DesignPulmonary Subvalvular StenosisCardiac Valve AnnuloplastyHeart Defects, CongenitalPyloric StenosisConstriction, PathologicVentricular Outflow ObstructionHeart VentriclesTricuspid Valve InsufficiencyEndocarditis, BacterialEndocarditisHeart AuscultationDiscrete Subaortic StenosisBlood Flow VelocityVentricular Function, LeftVenous ValvesRetrospective StudiesProspective StudiesTime FactorsThoracotomyNoonan SyndromeReoperationAortic CoarctationHypoplastic Left Heart SyndromeHeart Septal Defects, VentricularPostoperative ComplicationsBloodless Medical and Surgical ProceduresPredictive Value of TestsProlapseAortic Stenosis, SubvalvularStroke VolumeMyxomaHeart AtriaObserver Variation