| cyanosis | <clinical sign> A bluish discolouration, applied especially to such discolouration of skin and mucous membranes due to excessive concentration of reduced haemoglobin in the blood. Origin: Gr. Kyanos = blue (21 May 1997) |
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| cyanosis retinae | Venous congestion of the retina. Shunt cyanosis, any blue colour of the entire skin or a region of the skin or mucous membrane due to a right to left shunt permitting unoxygenated blood to reach the left side of the circulation. (05 Mar 2000) |
| hereditary methemoglobinaemic cyanosis | Methemoglobinaemia due to formation of any one of a group of abnormal a chain or b chain haemoglobins collectively known as haemoglobin 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, methemoglobinaemia due to deficiency of cytochrome b5 reductaseor methemoglobin reductase, the enzyme responsible for reduction of intraerythrocyte methemoglobin; cyanosis is improved by ascorbic acid or methylene blue; autosomal recessive inheritance, one case of methemoglobinaemia has been reported that apparently is due to a deficiency of cytochrome b5. Synonym: hereditary methemoglobinaemia, hereditary methemoglobinaemic cyanosis, primary methemoglobinaemia. (05 Mar 2000) |
| tardive cyanosis | cyanose tardive |
| toxic cyanosis | Cyanosis due to methemoglobin formation resulting from the action of certain drugs, e.g., nitrites. (05 Mar 2000) |
| late cyanosis | cyanose tardive |