• Ke Wang
  • Rui Zeng


Cyanosis refers to a bluish color of the skin and mucous membranes resulting from an increased quantity of reduced hemoglobin (>50 g/L). It may also due to the rise of sulfhemoglobin (SHb), methemoglobin (MetHb) and carboxyhemoglobin (HbCO). Cyanosis can be not only systemic but also limited to peripheral, often seen in the thinner skin, less pigment and capillary-rich parts, such as tongue, lips, nose, earlobes, cheek and finger (toe) nail bed, etc.

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© Springer Nature Singapore Pte Ltd. and People's Medical Publishing House 2020

Authors and Affiliations

  • Ke Wang
    • 1
  • Rui Zeng
    • 2
  1. 1.Department of RespiratoryJilin UniversityChangchunChina
  2. 2.Department of CardiologySichuan UniversityChengduChina

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