Ventricular Outflow ObstructionTripelennamineCardiomyopathy, HypertrophicEchocardiographyHeart VentriclesPulmonary ValveUrethral ObstructionHeart SeptumUrinary Bladder Neck ObstructionHepatic VeinsAortic Stenosis, SubvalvularIntestinal ObstructionAirway ObstructionBudd-Chiari SyndromePulmonary Valve StenosisTetralogy of FallotHeart Septal Defects, VentricularHeart Defects, CongenitalUreteral ObstructionVenous ValvesPulmonary Valve InsufficiencyHeart NeoplasmsVentricular Premature ComplexesIliac VeinAortic ValvePhlebographyPulmonary Subvalvular StenosisVenous InsufficiencyTreatment OutcomeCardiac CatheterizationPostthrombotic SyndromeCatheterizationAortic Valve StenosisTransposition of Great VesselsElectrocardiographyTachycardia, VentricularCatheter AblationVena Cava, InferiorUrinary RetentionVenous PressureFollow-Up StudiesEchocardiography, TransesophagealConstriction, PathologicHypoplastic Left Heart SyndromeRetrospective StudiesHeart Valve Prosthesis ImplantationEchocardiography, DopplerPulmonary AtresiaHemodynamicsCardiac Surgical ProceduresDuodenal ObstructionHeart Valve ProsthesisVentricular SeptumSinus of ValsalvaMitral ValveDiscrete Subaortic StenosisVentricular Function, RightVentricular Dysfunction, RightInfant, Newborn