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Cyanosis is a physical sign causing bluish discoloration of the skin and mucous membranes. Cyanosis is caused by a lack of oxygen in the blood. Cyanosis is associated with cold temperatures, heart failure, lung diseases, and smothering.yanosis. [sÄ«â²ÉnÅâ²sis]. Etymology: Gk, kyanos, blue, osis, condition. bluish discoloration of the skin and mucous membranes caused by an excess of deoxygenated hemoglobin in the blood or a structural defect in the hemoglobin molecule, such as in methemoglobin.
Photo Credit ecg view image by JASON WINTER from Fotolia.com. Generally more noticeable when the patient is fair skinned, cyanosis is a condition where the skin and mucous membranes turn blue due to hypoxia. Hypoxia occurs when the levels of oxygen in the blood are inadequate for the needs of the whole body. Nelson Textbook of Pediatrics states that in hypoxemia, the skin will turn a dusky blue and the whites of the eyes will turn gray.