congenital methemoglobinemia


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Related to congenital methemoglobinemia: methemoglobin test

con·gen·i·tal met·he·mo·glo·bi·ne·mi·a

1. methemoglobinemia due to formation of any one of a group of abnormal α chain [MIM*141800] or β chain [MIM*141900] hemoglobins collectively known as hemoglobin M. Slate-gray cyanosis occurs in early infancy, without pulmonary or cardiac disease, and is resistant to ascorbic acid or methylene blue therapy; autosomal dominant inheritance;
2. methemoglobinemia due to deficiency of cytochrome b5 reductase [MIM*250790] or methemoglobin reductase [MIM*250700], the enzyme responsible for reduction of intraerythrocyte methemoglobin; cyanosis is improved by ascorbic acid or methylene blue; autosomal recessive inheritance;

congenital methemoglobinemia

Elevated levels of methemoglobin in the blood, resulting from one of several hereditary deficiencies of methemoglobin reductase. Affected persons may appear mildly cyanotic but are rarely symptomatic.

con·gen·i·tal met·he·mo·glob·i·ne·mi·a

(kŏn-jeni-tăl met-hēmō-glō-bi-nēmē-ă)
1. Methemoglobinemia due to formation of any one of a group of abnormal α chain or β chain hemoglobins collectively known as hemoglobin M.
2. Methemoglobinemia due to deficiency of cytochrome b5 reductase or methemoglobin reductase.
References in periodicals archive ?
MetHb is normally formed in small quantities and is rapidly destroyed by the NADH-MetHb reductase (cytochrome b5 reductase) enzyme in the erythrocytes, however, congenital methemoglobinemia patients have a deficiency of this enzyme.
Congenital methemoglobinemia due to diaphorase deficiency with mental retardation.
Severe oxyhemoglobin desaturation during induction of anesthesia in a patient with congenital methemoglobinemia. Anesthesiology 2001; 95:1296-1297.
The patient was discharged to home on day 8 with a diagnosis of community-acquired pneumonia that responded to antibiotic therapy and congenital methemoglobinemia attributable to a HbM variant.

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