engleski

Visual Evoked Potentials in Multiple Sclerosis Patients Treated with Interferon beta-1a

Aim was to study pattern-reversal visual evoked potentials (VEP) in patients with relapsing remitting multiple sclerosis (RRMS) on interferon beta 1-a treatment. In a randomized, prospective, non-blinded, placebo-uncontrolled study, VEP were studied in 9 patients (18 eyes) with RRMS treated with interferon. Three of them have had an episode of unilateral optic neuritis. VEP were first recorded before treatment and then followed up for 12 months, at 3-month intervals, in the time when patients were receiving interferon, 11 ug twice weekly. P100 latency and P100 amplitude in response to full field, right and left half-field stimulation were evaluated. For the group of 18 eyes, there was no statsistically significant difference in P100 latency and amplitude before and after 6 months of treatment. In individual cases P100 latency was delayed in 3 eyes of 3 patients with a history of optic neuritis before tretament. At follow-up, p100 latency remained delayed in 3 eyes with a history of optic neuritis. further, in 3 eyes of two patients who have had normal p100 latency before treatment, p100 latency became delayed. Overall, P100 latency was at follow-up delayed in 6 eyes of 5 patients. Interferon beta 1-a (22 ug per week) administered for 12 months during 1998/99 in Croatia showed no statistically signifact VEP changes in the group of RRMS patients. However, VEP may reveal evidence for asymptomatic deterioration.

evoked potentials; visual; interferon-beta; multiple sclerosis

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