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Multicenter Study
. 2022 Apr:68:31-37.
doi: 10.1016/j.jcrc.2021.11.009. Epub 2021 Dec 3.

Prognostication using SpO2/FiO2 in invasively ventilated ICU patients with ARDS due to COVID-19 - Insights from the PRoVENT-COVID study

Collaborators, Affiliations
Multicenter Study

Prognostication using SpO2/FiO2 in invasively ventilated ICU patients with ARDS due to COVID-19 - Insights from the PRoVENT-COVID study

Jan-Paul Roozeman et al. J Crit Care. 2022 Apr.

Abstract

Background: The SpO2/FiO2 is a useful oxygenation parameter with prognostic capacity in patients with ARDS. We investigated the prognostic capacity of SpO2/FiO2 for mortality in patients with ARDS due to COVID-19.

Methods: This was a post-hoc analysis of a national multicenter cohort study in invasively ventilated patients with ARDS due to COVID-19. The primary endpoint was 28-day mortality.

Results: In 869 invasively ventilated patients, 28-day mortality was 30.1%. The SpO2/FiO2 on day 1 had no prognostic value. The SpO2/FiO2 on day 2 and day 3 had prognostic capacity for death, with the best cut-offs being 179 and 199, respectively. Both SpO2/FiO2 on day 2 (OR, 0.66 [95%-CI 0.46-0.96]) and on day 3 (OR, 0.70 [95%-CI 0.51-0.96]) were associated with 28-day mortality in a model corrected for age, pH, lactate levels and kidney dysfunction (AUROC 0.78 [0.76-0.79]). The measured PaO2/FiO2 and the PaO2/FiO2 calculated from SpO2/FiO2 were strongly correlated (Spearman's r = 0.79).

Conclusions: In this cohort of patients with ARDS due to COVID-19, the SpO2/FiO2 on day 2 and day 3 are independently associated with and have prognostic capacity for 28-day mortality. The SpO2/FiO2 is a useful metric for risk stratification in invasively ventilated COVID-19 patients.

Keywords: Acute respiratory distress syndrome; COVID-19; Mechanical ventilation; Pulse oximetry; Resource limited settings; SpO(2)/FiO(2).

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Conflict of interest statement

Declaration of Competing Interest None.

Figures

Fig. 1
Fig. 1
Predictive capacity of SpO2/FiO2 during the first three days of invasive ventilation. Panel A: SpO2/FiO2 on day 1, Panel B: SpO2/FiO2 on day 2, Panel C: SpO2/FiO2 on day 3. Legend: AUC, area under the curve.
Fig. 2
Fig. 2
The relationship between observed and calculated PaO2/FiO2 values using a Deming regression. Legend: The dashed line depicts the ideal accuracy line; the solid line shows the Deming regression estimation.

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