advertisement
Abstract #58935 Published in IGR 16-3
Schlemm's canal expands after trabeculectomy in patients with primary angle-closure glaucoma
Hong J; Yang Y; Wei A; Deng SX; Kong X; Chen J; Girard MJ; Mari JM; Xu J; Sun XInvestigative Ophthalmology and Visual Science 2014; 55: 5637-5642
PURPOSE: To evaluate the in vivo changes in the Schlemm's canal (SC) in patients with primary angle-closure glaucoma (PACG) after trabeculectomy using spectral-domain optical coherence tomography (SD-OCT). METHODS: Forty eyes of 40 patients with PACG who underwent trabeculectomy were included. All participants underwent SD-OCT. The diameter and area of SC were examined and measured before and within 1 month after trabeculectomy. All SD-OCT images were processed using adaptive compensation algorithm to improve contrast and image quality. Multivariate linear regression analysis was performed for predictors of percentage change in the mean SC diameter and area. RESULTS: The mean age of participants was 60.5 ± 14.6 years. Adaptive compensation significantly increased the percentage of sections in which SC was observable in the subjects studied from 52.5% (21/40) to 75.0% (30/40), which has acceptable intraobserver and interobserver repeatability. There was a significant increase in the SC diameter and area at the follow-up examination compared with the baseline value (SC diameter: 34.2 ± 6.2 μm vs. 28.4 ± 6.1 μm; SC area: 8117 ± 1942 μm(2) vs. 5200 ± 996 μm(2); all P < 0.001). After multivariate analysis, the only variable related to changes in SC was percentage change in IOP (SC diameter, P = 0.002; SC area, P < 0.001). In addition, the magnitude of the change in the SC area also correlated with angle opening distance at 750 μm from the scleral spur at baseline. CONCLUSIONS: Expansion of SC was observed after trabeculectomy in PACG patients. The degree of SC expansion was related to the extent of the IOP decrease.
Department of Ophthalmology and Visual Science, Eye, Ear, Nose, and Throat Hospital, Shanghai Medical College, Fudan University, Shanghai, China.
Full articleClassification:
2.5.2 Schlemms canal (Part of: 2 Anatomical structures in glaucoma > 2.5 Meshwork)
12.8.1 Without tube implant (Part of: 12 Surgical treatment > 12.8 Filtering surgery)
