Fig. 6
Histopathology of the pulmonary vessels. A Representative images of the hematoxylin and eosin staining of the pulmonary medium vessels. Magnification ×200. B Representative images of pulmonary small vessels. Magnification ×400. Pulmonary vessels of the 20 cmH2O and 25 cmH2O groups showed varying degrees of vessel wall thickening, extravascular edema, and inflammatory cell infiltration as indicated by black arrows