Fig. 5

Scatter plot between lung aeration score (LUS) and right diaphragmatic thickening fraction (DTF) assessed by ultrasound. Filled circles indicate the patients successfully weaned from mechanical ventilation; open circles indicate the patients with weaning failure. The vertical dashed line indicates LUS of 14; the horizontal dash line indicates DTF of 20%. LUS and DTF were assessed at 30-min after a spontaneous breathing trial