Matthew I Maycock

Type 1 congenital methaemoglobinaemia is a rare cause of cyanosis which may manifest in affected individuals during concomitant illness. Treatment indications and aims differ from that of acquired methaemoglobinaemia. Type 1 methaemoglobinaemia is a distinct condition from the type 2 form which has a high mortality rate in infancy. A 25 year old male with known type 1 congential methaemoglobinaemia presented with cyanosis in the context of Influenza A with raised methaemoglobin levels on arterial blood gas analysis.