Tornambe Paul E
From Poway, California.
Retin Cases Brief Rep. 2007 Fall;1(4):229-31. doi: 10.1097/01.iae.0000223713.17726.db.
To demonstrate, in vivo, that infusion cannula forces of air may strike the retina and optic nerve, which may explain why some patients develop post vitrectomy scotomas.
Case report.
During a vitrectomy for a macular hole, following a subtotal fluid/air exchange using a 23-gauge infusion cannula and a 25-gauge chandelier light, an unusual circular light reflex was noted on the surface of the retina inferior and nasal to the optic nerve.
The light reflex appeared at a position opposite the infusion cannula; rotating the direction of the infusion cannula moved the reflex from an area inferior to the optic nerve to over the nerve and even on the macula. The reflex disappeared when the air infusion was stopped and reappeared when the air infusion resumed.
Air infusion forces are directed on to the surface of the retina and these forces might damage the retina resulting in post vitrectomy scotomas.
在活体中证明，注入空气的套管产生的力可能冲击视网膜和视神经，这或许可以解释为什么一些患者在玻璃体切除术后会出现暗点。
病例报告。
在为黄斑裂孔进行玻璃体切除术时，使用23号注入套管和25号吊灯式照明进行部分液体/空气交换后，在视神经下方和鼻侧的视网膜表面观察到一种异常的圆形光反射。
光反射出现在注入套管相对的位置；旋转注入套管的方向会使反射从视神经下方的区域移至神经上方甚至黄斑上。停止注入空气时反射消失，恢复注入空气时反射重新出现。
注入空气的力作用于视网膜表面，这些力可能会损伤视网膜，导致玻璃体切除术后出现暗点。
