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Baseline IOP predicts selective laser trabeculoplasty success at 1 year post-treatment: results from a randomised clinical trial

Department of Ophthalmology, The University of Ottawa Eye Institute, 501 Smyth Road, Ottawa, Ontario, K1H 8L6 Canada

Correspondence to:
Correspondence to:
Dr William G Hodge
The University of Ottawa Eye Institute, 501 Smyth Road, Ottawa, ON K1H 8L6 Canada; whodge{at}ottawahospital.on.ca

Background/aims: The efficacy and safety of selective laser trabeculoplasty (SLT) has been found to be equivalent to argon laser trabeculoplasty (ALT). Since SLT produces significantly less disturbance to the trabecular meshwork and is theoretically more repeatable than ALT, it has potential to replace ALT as the standard procedure to treat medically uncontrolled open angle glaucoma. This study’s objective is to determine factors that predict successful SLT at 1 year post-treatment.

Methods: As part of a randomised clinical trial comparing the efficacy and safety of SLT to ALT, data on 72 SLT patients were collected, and successful SLT defined as having an SLT induced intraocular pressure (IOP) reduction of 20% at 1 year post-treatment follow up.

Results: 43 out of the 72 patients who had completed their 1 year follow up visit had an IOP reduction of 20% from baseline. No glaucoma risk factors studied predicted successful SLT. The amount of trabecular meshwork pigmentation was not a significant predictor. However, it was discovered that baseline IOP strongly predicted SLT success (odds ratio = 1.16; p = 0.0001).

Conclusion: SLT success was significantly predicted by baseline IOP but not by age, sex, other glaucoma risk factors, type of open angle glaucoma, or by degree of trabecular meshwork pigmentation.

Abbreviations: ALT, argon laser trabeculoplasty; BCVA, best corrected visual acuity; IOP, intraocular pressure; PI, peripheral laser iridotomy; SLT, selective laser trabeculoplasty; TM, trabecular meshwork

Keywords: selective laser trabeculoplasty; intraocular pressure; predictors; glaucoma risk factors

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				K F Damji, A M Bovell, W G Hodge, W Rock, K Shah, R Buhrmann, and Y I Pan Selective laser trabeculoplasty versus argon laser trabeculoplasty: results from a 1-year randomised clinical trial Br. J. Ophthalmol., December 1, 2006; 90(12): 1490 - 1494. [Abstract] [Full Text] [PDF]

				P B Johnson, L J Katz, and D J Rhee Selective laser trabeculoplasty: predictive value of early intraocular pressure measurements for success at 3 months Br. J. Ophthalmol., June 1, 2006; 90(6): 741 - 743. [Abstract] [Full Text] [PDF]