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Veronica Haysa Yamada, Christiane Rolim de Moura, Norma Allemann, Vespasiano Rebouças-Santos; Evaluation of drainage implant tube position by anterior segment optical coherence tomography in pediatric glaucoma. Invest. Ophthalmol. Vis. Sci. 2017;58(8):2077.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the position and length of the tube in the anterior chamber by anterior segment optical coherence tomography in pediatric glaucoma patients
Retrospective study of patients with pediatric glaucoma, submitted to surgical procedures at São Paulo Hospital – Federal University of São Paulo, from January 2006 to January 2015 (108 months). The intracameral portion of tube implant was evaluated with Visante OCT (Zeiss, software version 22.214.171.124) using a longitudinal scan of the tube. Measurements of the tube parameters were performed using calipers and the angle tool of the device’s software and Image J`s software applied to the images in “RAW mode".The parameters of the tube considered were length from the bevel-edged to the sclerolimbal junction; position: distance from the extremity of the tube to the anterior iris surface (T-I distance) and to the posterior endothelial surface (T-C distance) and the angle between the tube and the posterior endothelial surface (T-C angle). Age, gender, diagnosis, date of surgery and corneal transparency data were collected as well.
Forty drainage implant tubes of 26 patients were included, 14 were male. Age ranged from 3 to 16 years-old. Etiological diagnosis included: primary congenital glaucoma (18), secondary glaucoma after cataract surgery (3), and glaucoma associated to other anomalies (6). Of the 40 tubes, 22 were implanted in the right eye and 18 in the left eye. Superior-temporal region was the most frequent location for the tube (28), followed by the superior-nasal region (11) and nasal-inferior region (1). Of the 26 patients, 22 corneas were clear, 8 were partially clear and 10 were opacified. Mean time of the first evaluation after surgery was 30.7 months of follow-up, and the mean (SD) T-I distance was 1.42 (±0.91) mm; T-C distance was 0.64 (±0.53) mm; T-C angle was 19.54 (±7.1) degrees; intracameral length was 3.15 (±1.05) mm. A second examination was performed after 48.5 months and the mean (SD) T-I distance was 1.48 (±0.75) mm (p=0.501); T-C distance was 0.48 (±0.47) mm (p=0.212); T-C angle was 13.80 (±7.7) degrees (p=0.096); intracameral length was 3.24 (±0.86) mm (p=0.520).
Anterior segment optical coherence tomography was helpful to evaluate the position of drainage implant tube position in anterior chamber of pediatric patients, sometimes aiding in planning a surgical intervention.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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