Brainstem lesions may be important in the development of epilepsy in multiple sclerosis patients: an evoked potential study.
OBJECTIVE
Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system, with epileptic seizures sometimes observed in the same patients. In this study, we used evoked responses to study the pathogenesis of epilepsy in MS.


METHODS
Patients with a diagnosis of definite MS and who had EPs performed (visual (VEP), brainstem auditory (BAEP) and short latency somatosensory (upper (USSEP) and lower (LSSEP))) were retrospectively included in this study. They were divided into three groups; Group I: Patients with no epilepsy and who were not taking anti-epileptic drugs (AED); Group II: Patients with epilepsy and taking AEDs; and Group III: Patients with no epilepsy who were taking AEDs for symptoms related to neuropathic pain.


RESULTS
Three hundred and fifty-five patients were included in this study; Group I: 229 patients (64.5%), Group II: 20 patients (5.6%) and Group III: 106 patients (29.9%). The proportion of patients with abnormal BAEP and USSEP was higher in Group II.


CONCLUSIONS
A positive association exists between the presence of epilepsy in MS patients and BAEP and USSEP abnormalities. Analysis of Group III ruled out AED use as a factor.


CONCLUSIONS
Brainstem lesions may be the cause of epileptogenicity in MS.
Papathanasiou
E S
ES
The Cyprus Institute of Neurology & Genetics, Nicosia, Cyprus. neurophy@cing.ac.cy
Pantzaris
M
M
Myrianthopoulou
P
P
Kkolou
E
E
Papacostas
S S
SS
D000328:Adult; D000927:Anticonvulsants / Q000494:pharmacology / Q000627:therapeutic use; D001933:Brain Stem / Q000187:drug effects / Q000503:physiopathology*; D004569:Electroencephalography / Q000379:methods; D004827:Epilepsy / Q000188:drug therapy / Q000209:etiology* / Q000473:pathology*; D016057:Evoked Potentials, Auditory, Brain Stem / Q000187:drug effects / Q000502:physiology*; D005073:Evoked Potentials, Somatosensory / Q000187:drug effects / Q000502:physiology; D005074:Evoked Potentials, Visual / Q000187:drug effects / Q000502:physiology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D009103:Multiple Sclerosis / Q000150:complications*; D010812:Physical Stimulation / Q000379:methods; D012189:Retrospective Studies; D013223:Statistics as Topic; D034941:Upper Extremity / Q000294:innervation
D000927:Anticonvulsants