Effect of brimonidine on anterior-chamber angle in patients with narrow angles
- Author:
Johanna Timoteo-Cervantes
1
;
Joseph Anthony Tumbocon
1
;
Ma. Margarita Lat-Luna
1
Author Information
- Publication Type:Journal Article
- Keywords: Narrow angles; Anterior-chamber angle
- MeSH: Brimonidine Tartrate; Miosis; Intraocular Pressure
- From: Philippine Journal of Ophthalmology 2011;36(2):69-72
- CountryPhilippines
- Language:English
-
Abstract:
Objective:This study investigated the effect of brimonidine on the anterior-chamber angle in eyes with narrow angles using noncontact three-dimensional anterior-segment analyzer Pentacam.
Methods:Nine eyes with narrow angles were distributed to one of three treatment groups—single topical dose of 0.15% brimonidine tartrate, 0.5% timolol maleate (positive control), or balanced salt solution (negative control)—in a prospective, single-masked, crossover, comparative trial. The primary outcome measure was anterior-chamber angle at baseline, and 2 and 4 hours after instillation of the treatment drug. Secondary outcome measures were pupil diameter, intraocular pressure (IOP), and anterior-chamber depth and volume. After a two-week washout period, eyes were crossed over to the other treatment modes. All baseline and posttreatment measurements were taken. Repeated analysis of variance (ANOVA) was used for statistical analysis.
Results:Anterior-chamber angle, depth, and volume did not differ significantly for all treatment groups. Brimonidine caused a significant decrease in pupil diameter, most notably 2 hours after instillation, from baseline of 2.36 ± 0.37 mm to 2.17 ± 0.35 mm. (p = 0.03). There was a significant decrease in IOP from baseline to hour 4 after treatment for both brimonidine (11.4 ± 2.2 to 9 ± 1.8 mm Hg, p < 0.001) and timolol (11.9 ± 2.3 to 9.4 ± 2.1 mm Hg, p = 0.003).
Conclusions:Brimonidine produced a miotic trend with no significant opening of the anterior-chamber angle in patients with narrow angles. - Full text:PJO 99.pdf
