Cyanosis can be seen in most examination cases. It is a grave mistake to miss such a finding. The advice below will help you answer questions.

There are 2 types of cyanosis

Peripheral cyanosis and central cyanosis

Causes of peripheral cyanosis

• Exposure to cold
• Raynaud’s phenomenon
• Congestive cardiac failure
• Hyper viscosity syndrome
• Shock

Causes of central cyanosis

• Congenital cardiac disease
• Eisenmenger’s syndrome
• Acute severe asthma
• Tension pneumothorax

Sites to look out for-

Peripheral cyanosis

• Tip of nose
• Ear lobe
• Fingers and sole
• Nail bed

Central cyanosis

• Tongue
• Gums, palate, cheek
• Lower palpebral conjunctiva

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