方法：回顾性分析2014-01/2015-09收治的74例74眼经赤道部裂孔视网膜脱离患者，在广角镜下行标准三通道23G玻璃体切除手术，随机选取37例37眼进行单次气液交换，37例37眼进行两次气液交换，观察两组患者术中手术并发症以及术后1wk，1、3mo视网膜复位成功率。

结果：两次气液交换组术中手术并发症几率小于单次气液交换组，术后1wk、1mo两次气液交换组视网膜复位成功率显著提高，差异有统计学意义(P<0.05)，术后3mo视网膜复位成功率无统计学差异(P>0.05)。

结论：两次气液交换操作简单，有利于初学者掌握，术中避免单次气液交换引流不完全需在后极部或周边部视网膜造孔引流，减少手术并发症发生，提高视网膜复位成功率，临床上有较大的应用价值。

METHODS: The retrospective analysis of the 74 cases(74 eyes)with retinal detachment at the equator from January 2014 to September 2015 were reviewed. All these patients were performed standard three channel 23G vitrectomy under a wide angle lens, in which, the 37 cases(37 eyes)were randomly selected and performed single fluid-gas exchange, and the other 37 cases(37 eyes)were performed twice fluid-gas exchange. The intraoperative surgical complications and the postoperative success rate of retinal reposition in 1wk, 1, 3mo after surgery of the two group patients were observed.

RESULTS: The intraoperative surgical complication rates of the twice fluid-gas exchange group were less than that of the single fluid-gas exchange group. The postoperative success rate of retinal reposition in the twice fluid-gas exchange group significantly increased in 1wk and 1mo after surgery, and the difference was statistically significant(P<0.05). But the postoperative success rate of retinal reposition in 3mo after surgery had no significant difference(P>0.05).

CONCLUSION: The twice fluid-gas exchange operation was simple and it was beneficial for beginners to master. The incomplete drainage of the single fluid-gas exchange and the pore drainage in the posterior pole or in the peripheral part of the retina were avoided during the surgery. The intraoperative surgical complication rates were reduced and the postoperative success rate of retinal reposition were improved. This operation method had great application value in clinic.