Cyanosis
DDx
DDx
DDx
- Hypoxia, eg, pneumonia, pulmonary embolism, congestive heart failure (CHF), valvular heart disease, hypotension, shunt, severe anemia, high altitude
- Cold exposure
- Raynaud’s syndrome
- Reflex sympathetic dystrophy
- Methemoglobinemia
- Thoracic outlet syndrome
- Polyarteritis nodosa
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