Fig. 1From: Comparison of ROX index (SpO2/FIO2 ratio/respiratory rate) with a modified dynamic index incorporating PaO2/FIO2 ratio and heart rate to predict high flow nasal cannula outcomes among patients with acute respiratory failure: a single centre retrospective studyKaplan–Meier plot for HFNC success probability based on Delta POX-HR for patients initiated on HFNC for acute respiratory failureBack to article page