狗双后肢高速火器伤后肺组织学和超微结构观察

本研究观察了狗双后肢高速枪弹伤后不同时间内肺组织学和超微结构的改变。结果表明,在伤后0.5h、6h、24h和72h肺脏均出现了不同程度的组织学和超微结构的改变。伤后0.5h和6h,组织学检查可见肺微血管扩张充血,毛细血管破裂,间质和肺泡内出血,局灶性肺不张和肺气肿。伤后24h和72h,除上述改变外,尚可见肺微血管栓塞和透明膜形成。超微结构检查,各组均可见不同程度的肺毛细血管内皮细胞肿胀。Ⅰ型肺泡上皮细胞肿胀,剥脱或变性坏死。Ⅱ型肺泡上皮细胞肿胀,微绒毛变短,数目减少,板层体排空。毛细血管腔内可见白细胞聚集和血小板扣压,白细胞呈明显脱颗粒。此外,本文还对肺损伤的可能机理进行了讨论。

Histopathological and Ultrastructural Observation of the Lungs after Gun-shot-wounds of the Thighs in Dogs

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.