Figure 2.

Parenchymal architecture was mostly intact in A) control lung and C) surfactant treated lung subjected to I/R; B) untreated lung subjected to I/R showed regions of alveolar collapse and atelectasis formation. Note the formation of small areas with intraalveolar edema (Ed) in B. After surfactant treatment, numerous small intraalveolar surfactant aggregates were observed. Some larger aggregates almost entirely filled several neighbouring alveoli (Surf) in C. Alv = alveolar lumen; V = vessel; Ed = edema; At = atelectasis; Surf = surfactant.