Case report: Dichloroacetate-induced methaemoglobinaemia in a G6PD-deficient neonate.

A 3-week-old neonate with glucose-6-phosphate dehydrogenase (G6PD) deficiency and primary lactic acidosis developed haemolytic jaundice and methaemoglobinaemia following treatment with dichloroacetate (DCA), a standard treatment for primary lactic acidosis. While this mechanism has been reported in the sheep model, it has not been described in humans. Our case reinforces the uncommon observation that a G6PD-deficient individual experiencing oxidative stress may develop concurrent methaemoglobinaemia. In this case, methylene blue, the standard treatment for methaemoglobinaemia, may result in further oxidative stress. The judicious use of blood transfusion to correct the oxygen-carrying capacity of our patient led to reversal of the methaemoglobinaemia.