P:F ratio: Difference between revisions

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(New page: :<math>{P/F\ ratio} = \left (\frac{PaO_2}{Fi0_2}\right) \times 100</math> An example in a healthy person: :<math>{476} = \left (\frac{100\ mm\ Hg}{21%}\right) \times 100</math> A high...)
 
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{{subpages}}
In [[pulmonary medicine]], [[critical care]] and [[anesthesiology]], the '''P:F ratio''' is the ratio of arterial oxygen concentration to the fraction of inspired oxygen. It reflects how well the lungs absorb oxygen from expired air. <ref>{{citation
| journal = Medscape Medical News
| contribution = P/F Ratio May Be a Marker of Potential Intraoperative Ventilator-Induced Lung Injury
| title = Coverage of the American Society of Anesthesiologists (ASA) 2009 Annual Meeting
| author = Caroline Helwick
| url = http://www.medscape.com/viewarticle/711235}}</ref>
:<math>{P/F\  ratio} = \left (\frac{PaO_2}{Fi0_2}\right) \times 100</math>
:<math>{P/F\  ratio} = \left (\frac{PaO_2}{Fi0_2}\right) \times 100</math>
An  example in a healthy person:
An  example in a healthy person:
Line 5: Line 13:
A  higher ratio indicates better gas exchange:
A  higher ratio indicates better gas exchange:
* Normal is 500
* Normal is 500
* [[Adult respiratory distress syndrome|ARDS]] is <  200
* [[Acute respiratory distress syndrome|ARDS]] is <  200


Comparative studies suggest this measure  correlates better with pulmonary shunts than does the A-a gradient.<ref  name="pmid6409506">{{cite journal |author=Covelli HD, Nessan VJ, Tuttle WK |title=Oxygen  derived variables in acute respiratory failure |journal=Crit.  Care Med. |volume=11 |issue=8 |pages=646–9 |year=1983 |pmid=6409506 |doi=}}</ref><ref name="pmid14769743">{{cite journal |author=El-Khatib  MF, Jamaleddine GW |title=A new oxygenation index for reflecting  intrapulmonary shunting in patients undergoing open-heart surgery  |journal=Chest  |volume=125  |issue=2  |pages=592–6  |year=2004  |pmid=14769743  |doi=}}</ref><ref name="pmid3191742">{{cite journal |author=Cane  RD, Shapiro BA, Templin R, Walther K |title=Unreliability of oxygen tension-based  indices in reflecting intrapulmonary shunting in critically ill patients  |journal=Crit.  Care Med. |volume=16 |issue=12 |pages=1243–5 |year=1988 |pmid=3191742 |doi=}}</ref>
Comparative studies suggest this measure  correlates better with pulmonary shunts than does the A-a gradient.<ref  name="pmid6409506">{{cite journal |author=Covelli HD, Nessan VJ, Tuttle WK |title=Oxygen  derived variables in acute respiratory failure |journal=Crit.  Care Med. |volume=11 |issue=8 |pages=646–9 |year=1983 |pmid=6409506 |doi=}}</ref><ref name="pmid14769743">{{cite journal |author=El-Khatib  MF, Jamaleddine GW |title=A new oxygenation index for reflecting  intrapulmonary shunting in patients undergoing open-heart surgery  |journal=Chest  |volume=125  |issue=2  |pages=592–6  |year=2004  |pmid=14769743  |doi=}}</ref><ref name="pmid3191742">{{cite journal |author=Cane  RD, Shapiro BA, Templin R, Walther K |title=Unreliability of oxygen tension-based  indices in reflecting intrapulmonary shunting in critically ill patients  |journal=Crit.  Care Med. |volume=16 |issue=12 |pages=1243–5 |year=1988 |pmid=3191742 |doi=}}</ref>


==References==
==References==
<references/>
{{reflist|2}}[[Category:Suggestion Bot Tag]]

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In pulmonary medicine, critical care and anesthesiology, the P:F ratio is the ratio of arterial oxygen concentration to the fraction of inspired oxygen. It reflects how well the lungs absorb oxygen from expired air. [1]

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.[2][3][4]

References

  1. Caroline Helwick, P/F Ratio May Be a Marker of Potential Intraoperative Ventilator-Induced Lung Injury, "Coverage of the American Society of Anesthesiologists (ASA) 2009 Annual Meeting", Medscape Medical News
  2. Covelli HD, Nessan VJ, Tuttle WK (1983). "Oxygen derived variables in acute respiratory failure". Crit. Care Med. 11 (8): 646–9. PMID 6409506[e]
  3. 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]
  4. 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]