CyanosisMethemoglobinemiaOsteoarthropathy, Secondary HypertrophicHeart Bypass, RightHeart Defects, CongenitalEbstein AnomalyArteriovenous MalformationsTetralogy of FallotHeterotaxy SyndromeInfant, NewbornPulmonary ArteryFontan ProcedureSulfhemoglobinPulmonary VeinsVena Cava, SuperiorMethylene BlueMethemoglobinBenzocaineHepatopulmonary SyndromeAngiographyCytochrome-B(5) ReductasePulmonary Valve StenosisDelayed DiagnosisTricuspid AtresiaHeart Septal Defects, AtrialArteriovenous FistulaPrenatal DiagnosisOximetryEarly DiagnosisTransposition of Great VesselsHeart Septal Defects, VentricularFatal OutcomeCardiac CatheterizationSensitivity and SpecificityInfant, Newborn, Diseases