Multicenter clinical trial for evaluating methylprednisolone pulse treatment of idiopathic optic neuritis in Japan

Background: A randomized, controlled clinical trial was conducted in 1991 t o compare an intravenous megadose of methylprednisolone with a control drug (mecobalamin) for treating acute idiopathic optic neuritis. Cases: Sixty-six cases from 22 clinical centers throughout Japan were exami ned to evaluate the treatment on visual function parameters, such as visual acuity, visual field, color vision, contrast sensitivity, and critical fli cker frequency. Observations: The methylprednisolone pulse treatment group showed faster re covery of visual function, particularly the visual acuity at 1 week (P < .0 5), Humphrey field analyzer mean deviation at 3 weeks (P < .05), and color vision at 1 week (P < .05). Recovery of contrast sensitivity at several dif ferent spatial frequencies was significant In the pulse treatment group at 1 (P < .01), 2 (P < .05), and 4 weeks (P < .05) after the start of treatmen t. Visual function test results at 12 weeks and 1 year were essentially the same in the two treatment groups. Side effects appeared more frequently in the purse treatment group than in the control (P < .05). Conclusions: Pulse treatment does not appear effective for idiopathic optic neuritis even though Visual function in the pulse treatment group of this trial recovered more quickly during the initial phase compared to the contr ols. More effective and specific treatment should be established for optic neuritis. (C) 1999 Japanese Ophthalmological Society.