Balloon ValvuloplastyCatheterizationAortic Valve StenosisPulmonary Valve StenosisMitral Valve StenosisIntra-Aortic Balloon PumpingAortic ValveAortic Valve ProlapseHeart Valve Prosthesis ImplantationPulmonary ValveCardiac CatheterizationRheumatic Heart DiseaseFollow-Up StudiesTreatment OutcomeFetal TherapiesAtrial SeptumTricuspid Valve StenosisMitral ValveHypoplastic Left Heart SyndromeHemodynamicsAngioplasty, BalloonEndocardial FibroelastosisBalloon OcclusionAortic Valve InsufficiencyCyanosisInfant, NewbornEchocardiographyWarm IschemiaTetralogy of FallotPulmonary ArteryHeart Defects, CongenitalAngioplasty, Balloon, CoronaryDog DiseasesGastric BalloonRecurrenceRetrospective StudiesMitral Valve InsufficiencyVenous InsufficiencyPregnancy OutcomeHeart Valve ProsthesisPregnancy Complications, CardiovascularDogsProspective StudiesEchocardiography, DopplerEchocardiography, TransesophagealPulmonary AtresiaFemoral VeinNoonan SyndromePostoperative ComplicationsMitral Valve AnnuloplastyPregnancy