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Previous Volume 352:631 February 10, 2005 Number 6 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: In Case 31-2004 (Oct. 14 issue),¹ which involves a four-year-old boy with the hepatopulmonary syndrome, the minimal increase in the partial pressure of arterial oxygen (from 52 mm Hg while the boy was breathing room air to 69 mm Hg while he was breathing 100 percent oxygen), after nearly a quintupling of the fraction of inspired oxygen (from 0.21 to 1.0), uncovers a fascinating aspect of this patient's physiology that is not touched on in the discussion: the shunt is dynamic and worsens with oxygen supplementation. The ratio of the partial pressure of arterial oxygen to the . . . [Full Text of this Article]

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