Abstract
Objective To analyze the pathogenic mechanisms and management methods of infusion air misdirection in microincisional vitrectomy. Methods The data of 440 eyes of 440 cases received vitrectomy from Jan.2016 to Jan.2017 were retrospectively analyzed. There were 412 cases of 23 G vitrectomy and 28 cases of 20 G vitrectomy. Results Infusion air misdirection occurred in 23 G vitrectomy in 15 eyes of 15 cases when performing air-fluid exchange. No case happened in 20 G vitrectomy. Infusion air misdirection was mainly caused by inability of trocar tip to penetrate the vitreous cortex and other factors. The management was released anterior chamber gas and readjusted infusion cannula. Conclusion Infusion air misdirection happens more frequently in 23 G vitrectomy than 20 G vitrectomy(χ2=4.141, P=0.042). This complication can be avoided or treated appropriately if recognized. Key words: Vitrectomy, microincisional; Infusion air misdirection; Air-fluid exchange; Mechanisms; Management
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