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Abstract #24091 Published in IGR 11-3
A Prospective, randomized, investigator-masked evaluation of the monocular trial in ocular hypertension or open-angle glaucoma
Realini TDOphthalmology 2009; 116: 1237-1242
See also comment(s) by Anjali Bhorade •
PURPOSE: To evaluate the clinical value of the monocular therapeutic drug trial in predicting long-term intraocular pressure (IOP) reduction. DESIGN: Prospective, randomized, investigator-masked trial. PARTICIPANTS: Twenty-six subjects with ocular hypertension or open-angle glaucoma. METHODS: Subjects attended 5 study visits: 2 on no IOP-lowering therapy, 1 on monocular therapy with latanoprost, and 2 on bilateral therapy. The monocular trial eye was randomly selected, and study personnel making IOP measurements were masked to randomization. The following parameters were calculated: the unadjusted IOP change (IOP in the randomized eye at the first on-treatment visit minus IOP in the same eye at the initiation of the monocular trial); the adjusted IOP change (the unadjusted IOP change minus the comparable IOP change in the untreated fellow eye between the same 2 visits); and the long-term IOP change (the difference of the mean of the 2 on-treatment IOP values during bilateral use and the mean of the 2 pretreatment IOP values). MAIN OUTCOME MEASURE: The relationship between short- and long-term IOP reduction, with the coefficient of determination (the square of the Pearson correlation coefficient, r) as the measure of association. RESULTS: The mean long-term IOP reduction after latanoprost therapy was -3.4±2.4 mmHg in first-treated eyes (P<0.0001) and -3.4±2.4 mmHg in second-treated eyes (P<0.0001). The mean unadjusted IOP reduction in the monocular trial eye was -3.1±3.4 mmHg; the correlation between the unadjusted IOP change and the long-term IOP change was weak to moderate (coefficient of determination 0.325). The mean adjusted IOP reduction was -2.8±4.3 mmHg; the correlation between the adjusted IOP change and the long-term IOP change was also weak to moderate (coefficient of determination 0.279). CONCLUSIONS: The practice of adjusting the IOP change in the treated eye by the IOP change in the untreated eye--the monocular drug trial--is no more informative than using the treated eye's unadjusted IOP change, and both of these methods are poor predictors of long-term IOP reduction with latanoprost.
Dr. T.D. Realin, West Virginia University Eye Institute, Morgantown, West Virginia 26505, USA. realinia@wvuh.com
Classification:
11.4 Prostaglandins (Part of: 11 Medical treatment)