Cyanosis of the nail bed
![Cyanosis of the nail bed](/TransAdam/doc/graphics/images/en/9895.jpg)
Cyanosis of the nail bed
Lack of oxygen in the blood causes a bluish discoloration in the skin or mucous membranes called cyanosis. Most cyanosis is seen as a result of congenital heart disease, pulmonary disease, or as a terminal event as in cardiopulmonary arrest.
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