- Bluish discoloration of the extremities and tongue
- If more than 5g/dl of deoxygenated hemoglobin is present in the capillary blood, the skin will have a bluish tinge.
- If the tongue is involved ⇒ central (cardiopulmonary) cyanosis
- If the digits only involved ⇒ peripheral (vasoconstriction) cyanosis
- Raynaud’s phenomena ⇒ connective tissue diseases
- Can cyanosis and pallor concomitant together in the same patient?