Figure Legends
Fig. 1 Lung zones used during ultrasound scanning [13]
R1: right upper anterior, R2: right lower anterior, R3: right lateral, same for the left side. The direction of the arrows represents the direction of the ultrasound probe.
Fig. 2 Four typical patterns of neonatal lung ultrasound
1) Normal lung areation with transverse repetition of pleural image which is A-line artifact (arrow), these patterns is given a severity score of zero. The absence of sliding in this study indicates the presence of a pneumothorax. 2) Longitudinal separated B lines (arrows) reaching the bottom of the image signifies interstitial fluid as in transient tachypnea of the newborn (TTN pattern). This pattern is given a severity score of 1. 3) Coalescent B lines with homogenous echographic view and thickened pleura as in respiratory distress syndrome (RDS pattern). This pattern is given a severity score of 2. 4) Subpleural air bronchogram (arrow) is seen in addition to the RDS pattern. This pattern is given a severity score of 3 (the highest score).
Fig. 3 Prediction of extubation success by lung ultrasound score and left ventricular eccentricity index
Receiver operating characteristic (ROC) curves for lung ultrasound scores at day 3 (Panel A), and day 7 (Panel B) and for left ventricular eccentricity index (Panel C). Area under the curve, 95% confidence interval, and p values are (0.71, 95% CI: 0.55 – 0.88, p=0.023), (0.92, 95% CI: 0.82 – 1.0, p<0.001) and (0.52, 95% CI: 0.32 – 0.71, p= 0.87), respectively.