TY - CHAP M1 - Book, Section TI - Cyanosis A1 - Jameson, J. Larry A1 - Fauci, Anthony S. A1 - Kasper, Dennis L. A1 - Hauser, Stephen L. A1 - Longo, Dan L. A1 - Loscalzo, Joseph PY - 2020 T2 - Harrison's Manual of Medicine, 20e AB - Bluish discoloration of the skin and/or mucous membranes are usually due to elevated quantity of reduced hemoglobin (>4 g/dL) in the capillary blood vessels. Findings are most apparent in the lips, nail beds, ears, and malar eminences. Cyanosis depends on absolute, not relative, quantity of desaturated hemoglobin, so may be less evident in pts with severe anemia, and more notable in pts with polycythemia. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=1167063020 ER -