Author/Editor		Liščić, Rajka M; Brecelj, Jelka
Title		Visual evoked potentials in multiple sclerosis patients treated with interferon beta-1a
Type		članek
Source		Croat Med J
Vol. and No.		Letnik 45, št. 3
Publication year		2004
Volume		str. 323-7
Language		eng
Abstract		Aim. To study pattern-reversal visual evoked potentials (VEP) in patients with relapsing-remitting multiple sclerosis on interferon beta-1a treatment. Methods. In a randomized, prospective, non-blinded, placebo-uncontrolled study, VEP were studied in 9 patients (18 eyes) with relapsing-remitting multiple sclerosis treated with interferon. Three of them have had an episode of unilateral optic neuritis. VEP were first recorded before interferon treatment and then followed up for 12 months, at 3-month intervals, in the time when patients were receiving interferon,11 pg twice weekly. All patients did not appear regularly at 3-months intervals follow-up, except for 6-month follow-up. P100 latency and P100 amplitude in responses to full field, right and left half-field stimulation were evaluated. Results. For the group of 18 eyes, there was no statistically significant difference in P100 latency and P100 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 treatment. 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. Conclusion. Interferon beta-1a therapy (22 pg per week) administered for 12 months during 1998/99 in Croatia showed no statistically significant VEP changes in the group of relapsing-remitting multiple sclerosis patients. However, VEP may reveal evidence for asymptomatic deterioration.
Descriptors		MULTIPLE SCLEROSIS INTERFERON-BETA EVOKED POTENTIALS, VISUAL