- Poster presentation
- Open access
- Published:
Relation between PaO2/FiO2 ratio, SpO2/FiO2 ratio, oxygenation index and ventilation ratio in critically ill patients
Critical Care volume 17, Article number: P92 (2013)
Introduction
Many authors have proposed less invasive ways to measure oxygenation in patients with ALI. The aim of the present study is to compare the already popular oxygenation index (OI) and PaO2/ FiO2 ratio (PFr) with other recently proposed indices such as SpO2/FiO2 ratio (SFr) and ventilation ratio (VR) in a mixed ICU population.
Methods
During a 6-month prospective observational study carried out in a polyvalent 10-bed adult ICU, ABGs were obtained from 145 patients. Two independent measurements were taken from each patient under the same mode of ventilation (SIMVPSV). PFr, SFr, VR and OI were calculated. Demographic data (APACHE II score, age, sex, diagnosis, body weight) were also recorded. Kolmogorov-Smirnov test for normality was calculated followed by bivariate nonparametric analysis (statistical significance: P < 0.05).
Results
A total of 290 measurements were included for further analysis. Mean ± SD values for age and APACHE II score were 61.2 ± 16 years and 15.4 ± 1.8, respectively, while median ± SD values for PFr are 257 ± 135, for SFr 211 ± 58, for OI 4.8 ± 4.46 and for VR 1.19 ± 0.31. Relations between PFr, SFr and OI are displayed in Table 1.
Conclusion
Our study identified a strong relation between PFr, SFr and OI but not VR. Thus, these markers may be used interchangeably as bedside indices of oxygenation in critically ill patients. Yet larger studies are needed to come to a safer conclusion.
References
Rice TW, et al.: Chest. 2007, 132: 410-417. 10.1378/chest.07-0617
Sinha P, et al.: Br J Anaesth. 2009, 102: 692-697. 10.1093/bja/aep054
Author information
Authors and Affiliations
Rights and permissions
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
About this article
Cite this article
Aslanidis, T., Myrou, A., Chytas, E. et al. Relation between PaO2/FiO2 ratio, SpO2/FiO2 ratio, oxygenation index and ventilation ratio in critically ill patients. Crit Care 17 (Suppl 2), P92 (2013). https://doi.org/10.1186/cc12030
Published:
DOI: https://doi.org/10.1186/cc12030