Association between SpO/FiO Ratio and PaO/FiO Ratio in Different Modes of Oxygen Supplementation.

Background: Acute hypoxemic respiratory failure (AHRF) is a major factor for increased mortality in the intensive care unit (ICU). We hypothesized that the noninvasive index SpO/FiO (SF) ratio can be used as a surrogate to invasive index PaO/FiO (PF) as SF ratio correlates with PF ratio in all modes of oxygen supplementation.

Patients And Methods: Patients with acute respiratory failure admitted to the intensive care unit were enrolled in this retrospective cross-sectional study.