Gonioscopy-Assisted Transluminal Trabeculotomy: A Retrospective Review of Cases with 6-month Follow-up

Abstract

Purpose : To report the safety and efficacy of performing a gonioscopy-assisted transluminal trabeculotomy
(“GATT”).

Methods : Patients were identified through a retrospective medical chart review of patients who underwent
GATT procedures between 12 July 2017 and 27 November 2018. Participants consisted of patients who
were referred for the treatment of glaucoma and who underwent a GATT.

Results : 44 patients, age ranging between 18 to 89, underwent a GATT with at least three months follow
up. Thirteen eyes had primary open angle glaucoma, twenty-six had secondary open angle glaucoma and
five had ocular hypertension. The average pre-GATT intra-ocular pressure was 30 mmHg. The post-
operative day one average intra-ocular pressure was 16.63 (44.6% decrease) and at one and six months
respectively was 15.39 (48.7% decrease) and 17.74 (41.87% decrease).
The average number of pre-GATT medications were 3.54 with twenty-two patients also taking oral
acetazolamide. The average number of medications on day one was 3.38, with thirty-one patients on oral
acetazolamide (Average dose was 455.64 mg per day). The number of medications at one month was to
3.39, with seven patients still requiring oral acetazolamide and at three months was 3.32 with five patients
still on oral acetazolamide. Average intra-ocular pressure at 6 months (27 patients at time of abstract
submission) was 16.42 mmHg. The average number of medications was 3.24. Four patients remained on
acetazolamide (Average dose 250 mg per day).
Only three patients required further surgical intervention to adequately control their intra-ocular pressure.

Conclusions : The preliminary review of the use of GATT, indicate that it as an effective angle surgical
intervention for patients with moderate glaucoma. Data collection is ongoing for 6 month follow up data.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.