Injury analysis of saccular stage control and ventilated bronchioles after 24 h and 15 d.

Mild injury: 45° bronchiole epithelium detached or absent; moderate: 45°–180° bronchiole epithelium detached or absent; severe: 180° bronchiole epithelium detached or absent. Injured data represent total no. of mild, moderate, and severely injured bronchioles. MV110+24 h lungs had a higher proportion of injured bronchioles relative to all other groups, of which most were classified as severely injured (p