Fig. 1
From: Airway ultrasound to detect subglottic secretion above endotracheal tube cuff
a A longitudinal view was obtained with the transducer placed at the anterior midline of the neck; b airway ultrasound (longitudinal view) showing subglottic secretions. c Relation of heterogenous subglottic secretions (blue watermark) and homogenous subglottic secretions (green watermark) with endotracheal (ETT) cuff, cricoid cartilage (CC) and cricothyroid membrane (yellow line)