Predictors of Helmet CPAP Failure in COVID-19 Pneumonia: A Prospective, Multicenter, and Observational Cohort Study

Figure 1

Accuracy of predictors of CPAP failure. Receiver operating characteristic (ROC) curves with areas under the ROC curves showing the performance for mROX index (a), A-a O₂ gradient (b), and HACOR score (c) in predicting CPAP failure at T0 (black lines) and T1 (grey lines). mROX index = modified ROX index (PaO₂/FiO₂/respiratory rate); A-a O₂ gradient = alveolar-arterial oxygen gradient; HACOR = heart rate, acidosis (pH), consciousness (Glasgow coma scale: GCS), oxygenation, and respiratory rate score; AUROC = area under the receiver operating characteristic curve.

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