P:F ratio: Difference between revisions
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In [[pulmonary medicine]] 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 | {{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 | | journal = Medscape Medical News | ||
| contribution = P/F Ratio May Be a Marker of Potential Intraoperative Ventilator-Induced Lung Injury | | contribution = P/F Ratio May Be a Marker of Potential Intraoperative Ventilator-Induced Lung Injury | ||
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==References== | ==References== | ||
{{reflist|2}} | {{reflist|2}}[[Category:Suggestion Bot Tag]] | ||
Latest revision as of 11:01, 30 September 2024
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
- ↑ 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
- ↑ Covelli HD, Nessan VJ, Tuttle WK (1983). "Oxygen derived variables in acute respiratory failure". Crit. Care Med. 11 (8): 646–9. PMID 6409506. [e]
- ↑ 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]
- ↑ 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]
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