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