Erschienen in:
01.02.2007 | Correspondence
Comment on Aboab et al.: Relation between PaO2/FiO2 ratio and FiO2: a mathematical description
verfasst von:
Randolph Cole
Erschienen in:
Intensive Care Medicine
|
Ausgabe 2/2007
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Excerpt
In their recent publication, Aboab et al. discussed the problems related to the use of the arterial PO
2 to fractional oxygen concentration ratio (P/F) to assess the efficiency of gas exchange in patients with hypoxemic respiratory failure, including ARDS and ALI [
1]. Emphasis was placed on the difference between true intrapulmonic shunt, usually determined clinically with administration of 100% oxygen, and what the authors define as intrapulmonary shunt fraction, the term that includes true shunt and reductions in PaO
2 due to ventilation–perfusion and diffusion abnormalities. Older terms that describe this second index of impaired gas exchange and may be more or less familiar to the reader are physiologic shunt [
2] and venous admixture [
3]. …