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Abstract
BACKGROUND: Several studies have suggested that high-flow nasal cannula (HFNC) is useful for respiratory support after extubation in subjects with COVID-19 pneumonia, whereas 18.2% subsequently needed to undergo re-intubation. This study aimed to evaluate whether the breathing frequency (f)-ratio of oxygen saturation (ROX) index, which has been shown to be useful for predicting future intubation, is also useful for re-intubation in subjects with COVID-19.
METHODS: We retrospectively analyzed mechanically ventilated subjects with COVID-19 who underwent HFNC therapy after extubation at 4 participating hospitals between January 2020–May 2022. We evaluated the predictive accuracy of ROX at 0, 1, and 2 h for re-intubation until ICU discharge and compared the area under the receiver operating characteristic (ROC) curve of the ROX index with those of f and SpO2/FIO2.
RESULTS: Among the 248 subjects with COVID-19 pneumonia, 44 who underwent HFNC therapy after extubation were included. A total of 32 subjects without re-intubation were classified into the HFNC success group, and 12 with re-intubation were classified into the failure group. The overall trend that the area under the ROC curve of the ROX index was greater than that of the f and SaO2/FIO2 was observed, although there was no statistical significance at any time point. The ROX index at 0 h, at the cutoff point of < 7.44, showed a sensitivity and specificity of 0.42 and 0.97, respectively. A trend of positive correlation between the time until re-intubation and ROX index at each time point was observed.
CONCLUSIONS: The ROX index in the early phase of HFNC therapy after extubation was useful for predicting re-intubation with high accuracy in mechanically ventilated subjects with COVID-19. We may need close observation for subjects with < 7.44 ROX index just after extubation because of their high risk for re-intubation.
- SARS-CoV-2
- mechanical ventilation
- extubation
- noninvasive ventilation
- breathing frequency
- re-intubation
- ROX index
Footnotes
- Correspondence: Nobuaki Shime MD PhD, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan. E-mail: nshime{at}hiroshima-u.ac.jp
- Copyright © 2023 by Daedalus Enterprises
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