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Minerva Anestesiologica 2007 June;73(6):377-9

Copyright © 2007 EDIZIONI MINERVA MEDICA

language: English

Perioperative methemoglobinemia

Arrivabene Caruy C. A., Cardoso A. R., Cespedes Paes F., Ramalho Costa L.

Department of Anesthesiology, Faculty of Medical Sciences, State University of Campinas (UNICAMP), São Paulo, Brazil


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We report a case of a male patient who underwent splenectomy for idiopathic thrombocytopenic purpura. Oxygen saturation was 92% by pulse oximetry and cyanosis was apparent during the perioperative period. Methemoglobin (metHb) levels were 10.4%. After removal of the tracheal tube, intravenous methylene blue (1 mg/kg) was administered because of persistently low SpO2 levels (87%). During preanesthetic evaluation, the patient did not inform the anesthesiologist that he had been taking dapsone.

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