The ultrastructure of the epithelium of terminal bronchioles in rabbits was studied 40 minutes after intratracheal administration of iodinated water-soluble non-ionic contrast agent iopamidol. The signs of pathological alteration of the epithelial cells may be a result of the transitional hypoxia during administration.
The secretory Clara cells were not stimulated to release their secretion, nor the signs of epithelial cells' proliferation were noticed.