Cyanosis is a bluish or purplish discoloration of skin and mucous membranes. Two mechanisms are involved in the development of cyanosis, systemic arterial oxygen desaturation and increased oxygen absorption by tissues. Cyanosis is evident when arterial oxygen desaturation falls below 85% or the concentration of deoxygenated hemoglobin (Hb) exceeds 5 gm/dl. Several factors can affect the appearance of cyanosis which include: skin pigmentation, Hemoglobin (Hb) levels, oxygen affinity to the hemoglobin (Hb).
Cyanosis pathophysiology
Acrocyanosis causes
Cyanosis causes
Cyanosis risk factors
Clubbing causes
Methemoglobinemia pathophysiology
Ischemic stroke pathophysiology
Acute retinal necrosis risk factors