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Epileptic Seizures in Multiple Sclerosis May Suggest Shared Pathology

It is not clear whether early onset of multiple sclerosis increases the risk for seizures.

Patients with MS who experience seizures are more likely to be younger at the age of MS onset than patients with MS who do not have seizures, according to a study reported in Neurological Sciences by the Epilepsy Study Group of the Italian Neurological Society. The disease course also tended to be slightly more severe in patients with seizures.

An overlap between MS and epileptic seizures has been observed in previous studies, although the significance of this is not well understood.2-7 The most common condition to show a higher incidence and prevalence  MS is epilepsy, estimated in 1 meta-analysis at 2.28% and 3.09%, respectively, compared with a frequency of <1% in the general population.

The authors of the current meta-analysis, led by Sara Gasparini, MD, from the Magna Graecia University of Catanzaro in Italy, selected 9 studies conducted from 1996 to 2014 from a total of 668 articles available. Of those, 4 studies showed a younger age at onset of MS by a mean difference of 5.42 (95% CI, −7.19 to −3.66; P <.001).

 Gasparini and colleagues found this pattern to be consistent with previous studies indicating a potentially more aggressive inflammatory process involved in early-onset MS, which may have a focus in the cerebral cortex.14,15 The presence of plaques in this region may play a role in the development of seizure activity.

Two studies pointed to an association between the presence of cortical lesions and seizures, although differences in the imaging techniques used did not allow for comparison between them.16,18 The first reported that a greater proportion of patients with MS with seizures had cortical lesions compared with patients with MS without seizures (84% vs 43%; P <.001), and that both the quantity and size of the lesions was larger in the MS-with-seizures group.18 The second study also found a higher mean number of lesions in patients with MS who had seizures.

Another feature that was prominent in 5 of the 9 studies evaluated was a trend toward higher Expanded Disability Status Scale scores among patients with MS and epilepsy, although the mean difference of 0.45 was not statistically significant (95% CI, −0.01 to 0.91; P =.054).10-12,16,17 In addition, the meta-analysis did not reveal any relevant trends in sex distribution or clinical type of MS associated with the expression of seizures.

Story Source: The above story is based on materials provided by NEUROLOGYADVISOR
Note: Materials may be edited for content and length

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