P:F ratio

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Revision as of 05:04, 3 April 2010 by imported>Robert Badgett (P/F ratio moved to P:F ratio)
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An example in a healthy person:

A higher ratio indicates better gas exchange:

  • Normal is 500
  • ARDS is < 200

Comparative studies suggest this measure correlates better with pulmonary shunts than does the A-a gradient.[1][2][3]

References

  1. Covelli HD, Nessan VJ, Tuttle WK (1983). "Oxygen derived variables in acute respiratory failure". Crit. Care Med. 11 (8): 646–9. PMID 6409506[e]
  2. El-Khatib MF, Jamaleddine GW (2004). "A new oxygenation index for reflecting intrapulmonary shunting in patients undergoing open-heart surgery". Chest 125 (2): 592–6. PMID 14769743[e]
  3. Cane RD, Shapiro BA, Templin R, Walther K (1988). "Unreliability of oxygen tension-based indices in reflecting intrapulmonary shunting in critically ill patients". Crit. Care Med. 16 (12): 1243–5. PMID 3191742[e]