Rubin J S, Thompson J T, Sjaarda R N, Pappas S S, Glaser B M
Retina Institute of Maryland, Baltimore, USA.
Retina. 1995;15(4):291-4.
Vitreous fluid that remains trapped in the peripheral vitreous cavity after vitrectomy with fluid-air exchange can result in a smaller than desired intravitreal gas bubble size. To evaluate the effectiveness of a single fluid-air exchange in dehydrating the vitreous cavity, we measured the rate and volume of posterior vitreous fluid migration after an initial fluid-air exchange.
Thirty-eight eyes undergoing vitrectomy for macular hole closure had measurements of posterior vitreous fluid accumulation at either 5, 10, 15, or 20 minutes after fluid-air exchange.
An average of 0.38 ml of fluid accumulated posteriorly within 10 minutes after the initial fluid-air exchange compared to 0.22 ml that accumulated after 5 minutes (P = 0.0003). A mean of 0.04 ml accumulated during each 5-minute interval between 10 and 20 minutes after the initial fluid-air exchange.
Fluid composing 10% of the vitreous volume may migrate and accumulate posteriorly within 10 minutes of an apparently complete fluid-air exchange. Fluid aspiration after a 10-minute wait after the initial fluid-air exchange helps maximize vitreous cavity dehydration and should be employed when a large gas bubble is required after vitrectomy.
在进行液气交换的玻璃体切除术后，滞留在周边玻璃体腔的玻璃体液可导致玻璃体内气泡大小小于预期。为评估单次液气交换使玻璃体腔脱水的有效性，我们测量了初次液气交换后玻璃体后界膜下液体积聚的速率和量。
对38例因黄斑裂孔封闭而接受玻璃体切除术的患眼，在液气交换后5、10、15或20分钟测量玻璃体后界膜下液体积聚情况。
初次液气交换后10分钟内，平均有0.38 ml液体在后界膜下积聚，而5分钟后积聚的液体量为0.22 ml（P = 0.0003）。初次液气交换后10至20分钟期间，每5分钟平均积聚0.04 ml液体。
在看似完全的液气交换后10分钟内，占玻璃体体积10%的液体可能会向后迁移并积聚。初次液气交换后等待10分钟后进行液体抽吸有助于使玻璃体腔脱水最大化，在玻璃体切除术后需要大的气泡时应采用此方法。
