Ventricular Outflow ObstructionCardiomyopathy, HypertrophicHeart SeptumAortic Stenosis, SubvalvularEchocardiographyTransposition of Great VesselsHeart Septal Defects, VentricularPulmonary ValveDiscrete Subaortic StenosisMitral ValveHeart VentriclesAortic ValveVentricular Premature ComplexesTetralogy of FallotHeart Defects, CongenitalAortic Valve StenosisEchocardiography, DopplerCatheter AblationAortic Valve InsufficiencyHeart Valve Prosthesis ImplantationCardiac Surgical ProceduresHeart NeoplasmsAortaCardiac CatheterizationPulmonary Valve InsufficiencyTachycardia, VentricularElectrocardiographyHeart Valve ProsthesisVentricular SeptumEchocardiography, Doppler, ColorEchocardiography, TransesophagealAortic CoarctationSinus of ValsalvaPulmonary Valve StenosisMitral Valve InsufficiencyVentricular Function, LeftEchocardiography, Three-DimensionalPulmonary Subvalvular StenosisDouble Outlet Right VentricleHemodynamicsEchocardiography, StressTreatment OutcomeBioprosthesisCardiac Pacing, ArtificialAorta, ThoracicFetal HeartFollow-Up StudiesHeart Valve DiseasesAblation TechniquesVentricular Function, RightPulmonary AtresiaHypoplastic Left Heart SyndromeBlood Flow VelocityVentricular Dysfunction, LeftPacemaker, ArtificialVentricular Dysfunction, RightHeartEthanolInfant, NewbornHeart Septal DefectsSystoleArrhythmogenic Right Ventricular DysplasiaReoperationDobutamineExercise TestStroke VolumeTripelennamineRetrospective StudiesCoronary CirculationTime FactorsObserver VariationMyxomaCardiac OutputMyocardial ContractionBrugada SyndromeFibromaSeverity of Illness IndexPostoperative ComplicationsPredictive Value of TestsPulmonary ArteryPericardiumHeart Conduction SystemHeart DiseasesProspective StudiesUltrasonography, PrenatalCardiotonic AgentsTakotsubo CardiomyopathyCatheterizationMagnetic Resonance Imaging, CineElectrophysiologic Techniques, CardiacEchocardiography, Doppler, PulsedDiastoleAngiocardiographyEndocardiumSensitivity and SpecificityBody Surface Potential MappingBundle-Branch BlockAorta, AbdominalPreoperative CareExercise Tolerance