• Annals of intensive care · Jan 2021

    Performance of the ROX index to predict intubation in immunocompromised patients receiving high-flow nasal cannula for acute respiratory failure.

    • Virginie Lemiale, Guillaume Dumas, Alexandre Demoule, Frederic Pène, Achille Kouatchet, Magali Bisbal, Saad Nseir, Laurent Argaud, Loay Kontar, Kada Klouche, Francois Barbier, Amelie Seguin, Guillaume Louis, Jean-Michel Constantin, Julien Mayaux, Florent Wallet, Vincent Peigne, Christophe Girault, Johanna Oziel, Martine Nyunga, Nicolas Terzi, Lila Bouadma, Alexandre Lautrette, Naike Bige, Jean-Herle Raphalen, Laurent Papazian, Fabrice Bruneel, Christine Lebert, Dominique Benoit, Anne-Pascale Meert, Samir Jaber, Djamel Mokart, Michael Darmon, Elie Azoulay, and Groupe de Recherche en Reanimation Respiratoire du patient d’Onco-Hématologie (GRRR-OH).
    • AP-HP, Hôpital Saint-Louis, Medical Intensive Care Unit and Department of Biostatistics, APHP, Hopital St-Louis, 1 avenue Claude Vellefaux, 75010, Paris, France. virginie.lemiale@sls.aphp.fr.
    • Ann Intensive Care. 2021 Jan 27; 11 (1): 17.

    BackgroundDelayed intubation is associated with high mortality. There is a lack of objective criteria to decide the time of intubation. We assessed a recently described combined oxygenation index (ROX index) to predict intubation in immunocompromised patients. The study is a secondary analysis of randomized trials in immunocompromised patients, including all patients who received high-flow nasal cannula (HFNC). The first objective was to evaluate the accuracy of the ROX index to predict intubation for patients with acute respiratory failure.ResultsIn the study, 302 patients received HFNC. Acute respiratory failure was mostly related to pneumonia (n = 150, 49.7%). Within 2 (1-3) days, 115 (38.1%) patients were intubated. The ICU mortality rate was 27.4% (n = 83). At 6 h, the ROX index was lower for patients who needed intubation compared with those who did not [4.79 (3.69-7.01) vs. 6.10 (4.48-8.68), p < 0.001]. The accuracy of the ROX index to predict intubation was poor [AUC = 0.623 (0.557-0.689)], with low performance using the threshold previously found (4.88). In multivariate analysis, a higher ROX index was still independently associated with a lower intubation rate (OR = 0.89 [0.82-0.96], p = 0.04).ConclusionA ROX index greater than 4.88 appears to have a poor ability to predict intubation in immunocompromised patients with acute respiratory failure, although it remains highly associated with the risk of intubation and may be useful to stratify such risk in future studies.

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