Cyanosis

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Name of Symptom/Sign:
**Cyanosis**
*Classifications and external resources*
ICD-10	R23.0
ICD-9	782.5

Cyanosis refers to the bluish coloration of the skin due to the presence of deoxygenated hemoglobin in blood vessels near the skin surface.

1 Types
- 1.1 Central cyanosis
- 1.2 Peripheral cyanosis
2 See also
3 External links

[edit] Types

It can occur in the fingers, including underneath the fingernails, as well as other extremities (called peripheral cyanosis), or in the lips and face (central cyanosis).

[edit] Central cyanosis

Central cyanosis suggests a circulatory or ventilatory problem that leads to poorer blood oxygenation in the lungs or greater oxygen extraction due to slowing down of blood circulation in the skin's blood vessels.

Acute cyanosis can be a result of asphyxiation or choking, and is one of the surest signs that respiration is being blocked.

The elementary principle behind cyanosis is that deoxygenated hemoglobin produces the bluish discoloration, and also produces vasoconstriction that makes it more evident. Thus oxygen deficiency - hypoxia - leads to blue discoloration of the lips and other mucus membranes.

[edit] Peripheral cyanosis

Peripheral cyanosis suggests that there is poor circulation in the small vessels involved, such as when a person's hands are very cold. However, this condition can also be permanent even in normal temperatures; see acrocyanosis.