• Ir J Med Sci · Sep 2008

    Case Reports

    A case of dapsone induced methaemoglobinaemia.

    • D O'Dwyer and N G McElvaney.
    • Department of Respiratory Medicine, Beaumont Hospital, Dublin, Ireland. daviodwyer@gmail.com
    • Ir J Med Sci. 2008 Sep 1;177(3):273-5.

    BackgroundWe present a case of dapsone induced methaemoglobinaemia that occurred in a patient who presented to the Emergency Department of a University Hospital. It is an uncommon condition that requires specific and urgent treatment in severe cases.AimsTo describe and evaluate the presenting symptoms, signs, diagnosis and management of acquired methaemoglobinaemia.MethodsWe describe a case of acquired methaemoglobinaemia as a result of dapsone ingestion with a literature review.ConclusionsAcquired methaemoglobinaemia is an uncommon condition that presents with non-specific signs and symptoms. It is caused by a variety of exogenous agents and results in a "saturation gap" between oxygen saturation on pulse oximetery and arterial blood gas analysis. Specific treatment with intravenous methylene blue is the treatment of choice. Full resolution can be expected with treatment but severe cases can be associated with shock and mortality.

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