ABSTRACT
The injurious changes of the microvasculature in the maxillofacial region due to high-velocity bullet injury were observed in different time intervals with scanning and transmission electron microscopy. It was found that there were microthrombus formation in the vascular lumen, and endothelial loss and dege-neration or necrosis of the vascular wall in the microvasulature around the wound. Our findings indicate that when early reconstructive surgery for the tissue defect due to gunshot wound especially for those in the maxillofacial region is to be performed with microsurgical technique, it is essential for the surgeon to realize and consider the wounding condition on the microvasculature of the recipient site.
ABSTRACT
Histopathological and ultrastructural changes of the lungs were observed in various intervals after high-velocity bullet wounds of the two thighs of dogs. It was found that histologically there were microvascular dilatation, congestion, capillary rupture, interstitial and alveolar bleeding, focal atelecta-sis and pulmonary emphysema in the first half hour and the 6th hour after injury. In addition, microvascular embolism and hyaline membrane formation were seen in the 24th and 72nd hour after injury. Under electron microscopy, there were swelling of capillary endothelium, swelling, degeneration and necrosis of type I pneumocytes, shortening and decreasing of the microvilli of type II pneu-mocytes, significant vacuolation of the lamonar bodies, accumulation of leucocytes and platelets in the capillary lumen,and obvious decrease of the granules in the leucocytes. The mechanism of the pulmonary injury accompanying bullet wound of the thighs was discussed.