Cyanosis

Cyanosis is a topic covered in the Harrison's Manual of Medicine.

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Bluish discoloration of the skin and/or mucous membranes are usually due to elevated quantity of reduced hemoglobin (>40 g/L [>4 g/dL]) in the capillary blood vessels. Findings are most apparent in the lips, nail beds, ears, and malar eminences.

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