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• 3 Types:
  1. !Cyanotic CHD (R→L intracardiac shunt)
  2. Pulmonary AVM
  3. Physiological shunt:
     • bronchial artery
     • thebesian vein (drain directly into all four heart chambers)
• Characteristic
  • Non-responsive to Hyperoxia Test (<150/>250)
  • Usually not accompanied by Hypercapnia (Type II RF): hyperventilation → functional lung unit help ensure globally normal PCO2
  • Cannot be treated by Oxygen Delivery Devices