Fig. 3.

Representative histological sections of both lungs at 3 hours.

There are less edema, thickening of the alveolar wall, and infiltration of inflammatory cells into the alveolar space and interstitial space in the 0.6 FiO₂ group, with a lower ALI score (the left lung: 2.1±1.3 vs. 3.3±1.1, P < 0.05; the right lung: 2.3±1.1 vs. 3.4±0.7, P < 0.05), compared with those in the 1.0 FiO₂ group. All photos are 200 magnifications.