Early ictal speech and motor inhibition in fronto-mesial epileptic seizures: a polygraphic study in one patient.
OBJECTIVE
To investigate ictal motor inhibition occurring during seizures in a patient with a tumor located in the left fronto-mesial pre-central cortex.


METHODS
Awake and sleep video-polygraphic monitoring, recording scalp EEG and EMG activities from several cranial, trunk and limbs muscles, was performed in a patient with drug-resistant recurrent focal motor seizures before surgical treatment. Speech/motor tasks were repeatedly administered to the patient during the recording sessions in order to evaluate the occurrence of early ictal motor inhibition.


RESULTS
Thirty-four seizures were recorded during wakefulness showing a stereotyped pattern of inhibition of speech and voluntary movements followed by sequential activation of upper limb-trunk-lower limb muscles contralateral to the tumor. Polygraphic recordings showed that: (1) initial speech and motor arrest were associated with the EMG evidence of progressive muscle tone suppression in cranial and right distal upper limb muscles; (2) tonic contraction of right deltoid, biceps brachii, intercostalis and paraspinalis muscles appeared after motor inhibition; (3) tonic-clonic activity in the right tibialis anterior muscle occurred at the end of seizures. Eleven subclinical seizures were recorded during sleep showing mild focal tonic EMG activity in right side trunk muscles.


CONCLUSIONS
Our findings evidenced early and somatotopically organized inhibition of voluntary movement at the beginning of epileptic seizures with fronto-mesial onset. The demonstration that speech and motor arrest were associated with progressive EMG suppression in cranial and limb muscles supports the hypothesis of motor inhibitory seizures originating in the mesial aspect of pre-motor frontal cortex.
Meletti
S
S
Division of Neurology, Department of Neurological Sciences, Bellaria Hospital, University of Bologna, Via Altura n. 3, 40139, Bologna, Italy. carloalberto.tassinari@ausl.bologna.it
Rubboli
G
G
Testoni
S
S
Michelucci
R
R
Cantalupo
G
G
Stanzani-Maserati
M
M
Calbucci
F
F
Tassinari
C A
CA
D001932:Brain Neoplasms / Q000150:complications* / Q000503:physiopathology*; D004569:Electroencephalography; D004827:Epilepsy / Q000150:complications* / Q000209:etiology / Q000503:physiopathology*; D017034:Epilepsy, Frontal Lobe / Q000150:complications / Q000503:physiopathology; D005260:Female; D006801:Humans; D008875:Middle Aged; D009069:Movement Disorders / Q000209:etiology* / Q000503:physiopathology; D013064:Speech Disorders / Q000209:etiology* / Q000503:physiopathology; D013997:Time Factors; D014851:Wakefulness