Hypoxia and normal chest x-ray (CXR)


  • Asthma
  • Pulmonary embolism
  • Early pneumonia
  • Early interstitial lung disease
  • Early pneumocystis pneumonia (PCP)
  • Shunt, eg, atrial or ventricular septal defect, arteriovenous malformation, atelectasis
  • Pulmonary hypertension
  • Chronic alveolar hypoventilation

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Last updated: December 1, 2014