Cyanosis
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Cyanosis refers to the bluish coloration of the skin due to the presence of deoxygenated hemoglobin in blood vessels near the skin surface.
Types
Cyanosis can occur in the fingers and extremities (called peripheral cyanosis), or in the lips and face (central cyanosis).
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.
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.de:Zyanose