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Methaemoglobinaemia with G6PD deficiency: rare cause of persistently low saturations in neonates

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Abstract

We report a very rare case of methaemoglobinaemia associated with glucose 6 phosphate dehydrogenase (G6PD) deficiency, complicating a respiratory illness in a preterm neonate. This neonate had consistently low saturation readings despite being ventilated at moderately high pressures in 100% oxygen. An arterial blood gas confirmed a high methaemoglobin level and a high pO2, inconsistent with the saturations. In addition, the bilirubin increased to exchange levels and was difficult to control with quadruple phototherapy. A double volume exchange transfusion was performed, which reduced both bilirubin and methaemoglobin. The pulse oximetry then started to correlate well with pO2. G6PD deficiency was confirmed. Conclusion: 

Paediatricians should remember that methaemoglobinaemia is a rare but important cause of persistently low saturations, and exchange transfusion is a reliable treatment for this condition.
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Keywords: G6PD deficiency; Hyperbilirubinaemia; Methaemoglobinaemia; Saturation

Document Type: Research Article

Publication date: 2011-07-01

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