Fig. 2From: Ultrasound-assessed diaphragmatic impairment is a predictor of outcomes in patients with acute exacerbation of chronic obstructive pulmonary disease undergoing noninvasive ventilationROC analysis comparing predictors for noninvasive ventilation (NIV) failure at baseline and within 2 hours after NIV was started. ΔTdi Change in diaphragm thicknessBack to article page