PubMed ID: 18989348
Author(s): Girach A, Aiello LP, Milton RC, Davis MD, Danis RP, Zhi X, Sheetz MJ, Vignati L; PKC-DRS2 Study Group. Sustained moderate visual loss as a predictive end point for visual loss in non-proliferative diabetic retinopathy. Eye (Lond). 2009 Jan;23(1):209-14. doi: 10.1038/eye.2008.324. Epub 2008 Nov 7. PMID 18989348
Journal: Eye (London, England), Volume 23, Issue 1, Jan 2009
PURPOSE In PKC-DRS2, the efficacy of the oral PKC-beta inhibitor, ruboxistaurin 32 mg/day, was measured by the primary end point of sustained moderate visual loss (SMVL: a > or = 15 letter decrease from baseline on the ETDRS (Early Treatment Diabetic Retinopathy Study) chart sustained at least for the last 6 months of study participation). We now evaluate whether SMVL is more accurate than moderate visual loss (MVL: a single occurrence of a decrease from baseline of > or = 15 ETDRS letters) for predicting future visual loss.
METHODS Study eyes with moderately severe to very-severe non-proliferative diabetic retinopathy, best-corrected visual acuity of at least 45 letters on the ETDRS chart (approximately Snellen 20/125), and no prior pan retinal photocoagulation were evaluated in 506 patients (869 eyes) who completed 36 months of treatment.
RESULTS Sixty-five percentage (26/40) of study eyes with the onset of SMVL within 24 months of enrolment still had SMVL at study completion (36 months). In comparison, only 24% (30/126) with MVL within 24 months had SMVL at study completion. Analyses based on data from 6, 12, and 18 months of treatment were similar.
CONCLUSIONS SMVL is a more predictable measure of subsequent visual loss than is a single time point measure of MVL.