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Misleading hyperoxia test.
  1. A M Enriques,
  2. R McKay,
  3. R M Arnold,
  4. J L Wilkinson


    A 2 day old infant with infracardiac total anomalous pulmonary venous connection achieved an arterial oxygen tension greater than 250 mmHg, breathing 100% oxygen. Diagnosis of cardiac disease was delayed several weeks. The anatomical basis for this phenomenon was streaming of systemic venous return across an inferior vena cava type atrial septal defect.

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