Purpose: The purpose of this study was to evaluate the intraocular gas dynamics after 23-gauge transconjunctival sutureless vitrectomy (TSV) as compared with 20-gauge pars plana vitrectomy (PPV).
Methods: A consecutive series of 290 eyes that experienced 20-gauge or 23-gauge vitrectomy with 25% sulfur hexafluoride (SF6) gas tamponade were retrospectively reviewed. Intraocular gas bubble size on postoperative Day 1 and Gas50, the interval to dissipate to a 50% gas fill, were evaluated.
Results: The mean intraocular bubble size on postoperative Day 1 was 92.0 ± 8.3% in the 20-gauge PPV cases and 83.8 ± 13.7% in the 23-gauge TSV cases (P < 0.001). The mean Gas50 was 8.6 ± 1.6 days in the 20-gauge PPV cases and 6.6 ± 2.2 days in the 23-gauge TSV cases (P < 0.001). Thorough peripheral vitrectomy and 23-gauge TSV were significantly associated with Gas50 ≤ 4 days (odds ratio, 4.62 and 16.8; P = 0.036 and P = 0.007, respectively). Among thoroughly vitrectomized eyes, 13 eyes treated with 23-gauge PPV with intraoperative suture placement at the sclerotomy sites had gas longevity comparative to those with 20-gauge PPV.
Conclusion: Eyes treated with 23-gauge TSV tend to have earlier gas disappearance or incomplete gas fill. Intraoperative suture placement would be a solution.
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