CyanosisMethemoglobinemiaSkinOsteoarthropathy, Secondary HypertrophicHeart Bypass, RightHeart Defects, CongenitalSkin AgingSkin DiseasesEbstein AnomalySkin NeoplasmsArteriovenous MalformationsTetralogy of FallotHeterotaxy SyndromeFontan ProcedureSulfhemoglobinPulmonary ArteryMethylene BluePulmonary VeinsVena Cava, SuperiorInfant, NewbornMethemoglobinBenzocaineCytochrome-B(5) ReductaseHepatopulmonary SyndromePulmonary Valve StenosisTricuspid AtresiaSkin Physiological PhenomenaHeart Septal Defects, AtrialSkin TestsAngiographyOximetryArteriovenous FistulaTransposition of Great VesselsSkin AbsorptionHeart Septal Defects, VentricularCardiac CatheterizationSkin Pigmentation