Mitral Valve StenosisMitral ValveAortic Valve StenosisHeart Valve ProsthesisMitral Valve InsufficiencyRheumatic Heart DiseasePulmonary Valve StenosisMitral Valve ProlapseAortic ValveHeart Valve Prosthesis ImplantationCatheterizationEndocarditisEchocardiography, TransesophagealHeart Valve DiseasesTricuspid Valve StenosisMitral Valve AnnuloplastyProsthesis FailureThrombosisAortic Valve InsufficiencyPulmonary ValveChordae TendineaeEchocardiographyBioprosthesisTricuspid ValveCarotid StenosisBalloon ValvuloplastyCardiac CatheterizationCalcinosisEchocardiography, DopplerEchocardiography, 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, BacterialHeart 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