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methemoglobinemia
(met″he-mo-glo″bĭ-ne´me-ә)
the presence of excessive methemoglobin in the blood, resulting in cyanosis and headache, dizziness, fatigue, ataxia, dyspnea, tachycardia, nausea, vomiting, and
drowsiness, which can progress to stupor, coma, and occasionally death. It may be either chemical- or drug-induced (acquired or toxic methemoglobinemia) or hereditary (congenital or hereditary methemoglobinemia).

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