Fig. 3From: Ultrasound-assessed diaphragmatic impairment is a predictor of outcomes in patients with acute exacerbation of chronic obstructive pulmonary disease undergoing noninvasive ventilationa Correlation between change in diaphragm thickness (ΔTdi) and transdiaphragmatic pressure capacity measured at maximal inspiration using the sniff maneuver (Pdi sniff). b Accuracy of ΔTdi and Pdi sniff in identifying patients with diaphragmatic dysfunction (DD)Back to article page