| 발표일자: |
2018년 11월 2일(금) ~ 11월 4(일) |
| 발표번호: |
P(e-poster)-408 |
| 발표장소: |
코엑스 컨퍼런스룸 3층 301 A-B |
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| ULTRASOUND BIOMICROSCOPIC DIAGNOSIS OF ANGLE CLOSURE MECHANISMS IN VIETNAMESE SUBJECTS WITH UNILATERAL ANGLE CLOSURE GLAUCOMA |
| Vietnam National Institute of Ophthalmology |
| Do Tan (1), Nguyen Xuan Hiep (1), Dao Lam Huong (1), Nguyen Thi Thuy Giang (1), Tran Tien Dat (2), Sushma Verma (3), Tin Aung (3,4), Nguyen Do Ngoc Hien (5) |
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Purpose : To identify the mechanisms of angle closure in the fellow eyes of Vietnamese subjects with unilateral primary angle closure glaucoma (PACG) using ultrasound biomicroscopy (UBM) before and after prophylactic laser peripheral iridotomy (LPI).
Design: Prospective observational study.
Participants: Patients diagnosed with PACG in one eye and primary angle closure suspect (PACS) in the other eye were included in this study, conducted from January 2014 to October 2014 at Viet Nam National Institute of Ophthalmology.
Methods : 112 PACS fellow eyes of 112 patients presenting withunilateral PACG were evaluated. All subjects underwent standard ophthalmic clinical examination and UBM imaging a week before and after LPI. Based on UBM images, the angle closure mechanism was defined according to the classification of Svend Vedel Kessing and John Thygesen as pupillary block(PB),plateau iris(PI) and mixed pattern.
Results: The proportion of PACS subjects who showed pupillary block (PB) was 86.6%, while 13.4% showed a plateau iris (PI) configuration prior to LPI. After LPI the pre-LPI PB group was reclassified, with 55.4% showing pure PB, and 31.3% showing mixed mechanisms (PB and PI). The proportion of patients with PI remained unchanged (13.4%) even after LPI. After the LPI, the angle opening significantly increased in the PB sub-group (14.01o ± 2.43, p<0.01)and reclassified mixed group (6.34o ± 1.71, p<0.01) but remained almost unchanged in the PI group (1.81o ± 0.98, p>0.05).
Results : .
Conclusion : Based on the UBM criteria,PI was found in 13.4% of PACS fellow eyes of Vietnamese subjects with PACG. The clinical and UBM features of patients showing PI before LPI remained almost unchanged after the procedure. The proportion of patients showing PB pre LPI reduced from 86.6% to 55.4% showing the important role of mixed mechanisms in PACG.
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