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J Bancaud

Publications and source records attributed to J Bancaud.

At least 19 recordsLinked to original sources
PubMed1992

Surgical therapy for frontal epilepsies.

We have described our 25 years experience concerning 100 patients operated on for frontal epilepsy. Results show that 55% of patients are practically cured of their seizures and that 76% benefited from cortectomy (reduction of more than 75% of seizures). These results are the worst in the total series of St. Anne. Reasons for success and especially failure were analyzed in detail: 1. SEEG methods gave good indications along three dimensions of the limits and borders of the cortical excision. 2. When clinical semiology and organization of ictal discharges give evidence for rapid bilateral discharge, with involvement of axial musculature and generalized tonic-clonic manifestations, experience shows that it is necessary to combine cortectomy with a section of the adjacent cortico-subcortical fibers of the corona radiata, as if propagation of ictal discharges were impeded if not interrupted by sectioning such fibers and the primary site were incapable of expressing itself clinically. 3. If the characteristics of seizures suggest the quasisimultaneous involvement of the two frontal lobes and the existence of bilateral multifocal epilepsy, we suggest that a systematized anterior callosotomy might lead to useful results. 4. Finally, we propose general criteria for indications and contraindications for surgery.

Adolescent↗
PubMed1979

[Contribution to anatomical and clinical studies of avoidance phenomena (author's transl)].

The authors report 5 cases of avoiding phenomenon of the hand from parietal lesions. Four of these patients were operated for intractable epilepsy, from a parietal cortectomy that implicated a certain amount of white matter. The avoiding phenomena observed are analyzed as elementary motor perturbations rather than a disturbance of motor comportment. The authors distinguish two types of avoiding phenomena: 1--Avoiding phenomenon of dystonic type occurs during any motor activity and persists during all its development. It is probably related to the removal of the cortex of the post-central gyrus and of the anterior part of the superior parietal lobule; 2--The initial avoiding phenomenon is brief and occurs only at the beginning of the movements which implicate solely the upper limb; it seems related to the removal of the internal part of the superior parietal lobule that corresponds approximately to areas 5 and 7 from Brodmann. Some hypotheses are discussed concerning the possible physio-pathological mechanisms of these disturbances.

Adolescent↗
PubMed1978

[Auditory response at the posterior part of the first temporal convolution (author's transl)].

Among the epileptic patients investigated by the stereotactic E. E. G. (Talairach) whose electrodes were introduced at or around the auditory cortex (Area 41, 42), the topography of the auditory responses by the electrical bipolar stimulation and that of the auditory evoked potential by the bilateral click sound stimulation were studied in relation to the ac--pc line (Talairach). The positive points of auditory responses and those of evoked potential were found in the posterior part of the first temporal convolution at or around the Hesch's transverse gyrus. The contralateral auditory responses to the stimulating electrodes situated more anterior and superior than the homolateral responses in lateral projection and more medial in frontal projection. The points of the sensation of "elevation" or "fall" elicited by the electrical stimulation which were thought to be related to the vestibular function were scattered more superior and posterior than the points of the auditory responses in lateral projection and more medial in frontal projection. This study gave the accurate topography concerning the auditory responses, the positive auditory evoked potentials and the vestibular function related sensation (sensation of "elevation" or "fall"). Further study will be required to elucidate the functional anatomy of the human auditory cortex.

Adolescent↗
PubMed1977

Clinical consequences of corticectomies involving the supplementary motor area in man.

Three patients with well-mapped, circumscribed ablations of the medial part of the frontal lobe are reported. A specific clinical evolution in 3 stages was observed: (1) post-operatively there was global akinesia, more prominent contralaterally, with an arrest of speech; (2) recovery occurred suddenly but even then there was severe reduction of spontaneous motor activity contralaterally, an emotional type facial palsy and a reduction of spontaneous speech; (3) long after the operation the only sequela was disturbance of the alternating movements of the hands. The anatomical basis of these disorders appears to be a lesion of the supplementary motor area (SMA). Three main points have been discussed, namely: (1) the nature of the motor disorder which may be a disturbance of the function of the SMA in initiating and sustaining spontaneous and automatic motor activity; (2) the nature of the arrest of speech which appears not to be aphasic; the studies reported in the present paper do not support a left cerebral dominance for the SMA as suggested by previous studies; (3) the method of clinical examination appears to be important in distinguishing between spontaneous and voluntary motor and speech performance. Differences in method may account for differences between our findings and those reported in previous studies.

Adolescent↗
PubMed1977

Ictal tonic postural changes and automatisms of the upper limb during epileptic parietal lobe discharges.

Tonic postural changes of the upper limb accompanied by epileptic parietal lobe discharges are not well known. The authors report 3 such cases. In the 3 patients, a total of 18 spontaneous seizures were recorded, 12 by telemetry, from either scalp electrodes or stereotactically implanted electrodes. Of these 18 seizures, 14 included tonic postural changes of the upper limb accompanied by a contralateral parietal discharge. Combining these 3 cases with the 4 such cases in the literature, the authors found that the clinical pattern consisted of a tonic postural change in one upper limb associated with automatisms of the opposite upper limb. It was also found that the same patient might have automatisms involving the upper limb in some seizures and upper limb postural changes in other seizures, both accompanied by the same electrical discharge. It is concluded that tonic postural changes and automatisms in the upper limb may be interchangeable.

Adult↗
PubMed1977

The seizures of frontal lobe epilepsy. A study of clinical manifestations.

We describe ictal clinical manifestations of frontal lobe epileptic seizures in 22 patients. After examination of all ictal clinical data, 14 catergories of signs and symptoms were established. The validity of the ictal clinical data used was confirmed on the basis of 99 frontal lobe seizures recorded by tele-electroencephalogram or tele-stereo-electroencephalogram. The main conclusion is that the frontal lobe appears to be partially connected with motor acitivity.

Adolescent↗
PubMed1976

Electrocorticography of waves associated with eye movements in man during wakefulness.

Waves associated with horizontal saccadic eye movements were recorded from cortical occipital areas through multilead intracerebral electrodes implanted for a few days in 6 drug-resistant epileptic patients in order to localize epileptogenic foci. The waves were studied statistically when the EEG activity was not disturbed by interictal discharges. Cortical occipital waves related to free eye movements while scanning complex material started at the end of the eye movement, later in fact than the corresponding scalp parieto-occipital phenomena. The amplitude of the cortical waves increased with the complexity of the external field (contrasts having no marked effect) and was reduced in an unpatterned field and in dim light. Waves persisted in darkness. Their amplitude was independent of the size of the eye movement. The latency of the waves, calculated from the onset of eye movement, increased with the size of the movement, the complexity of the external field and also in darkness. Imposed eye movements induced cortical waves of larger amplitude and shorter latency and anticipatory potential changes beginning before onset of the eye movement. Waves related to eye movements differed from blinks and from responses to several types of light stimulation more strikingly in cortical records than in those from the scalp. These findings are discussed in relation to lambda waves, activation waves and eye movement potentials, expectancy waves and premotor potentials, and to the phenomena of perceptual blanks preceding normal perception after fixation of gaze. The importance of the subject's attention is emphasized.

Adolescent↗
PubMed1976

Automatisms during frontal lobe epileptic seizures.

Three new cases of automatisms occurring during frontal lobe epileptic seizures are reported. If these cases are added to those already published and adequately described in the literature, a total of 12 cases is obtained. An attempt is made to elucidate the clinical characteristics of automatisms encountered during frontal lobe seizures. This kind of automatism would seem to be clinically distinguishable from other types.

Adolescent↗
PubMed1976

[Behavioral manifestations induced by electric stimulation of the anterior cingulate gyrus in man].

The electrical stimulation of a restricted part of area 24 in awake man elicits important behavioral changes. The present study is dealing with 83 epileptic patients whose brain activity was recorded in SEEG conditions, with a view to possible neurosurgery. In order to determine how seizures originate and propagate, 116 multileads electrodes (65 right, 51 left) were stereotaxically inserted in the anterior part of the cingular gyrus. 521 stimulations were performed. In 362 cases, this stimulation induced a particular behaviour which was characterized by an arousal, motor activities (involving fingers and hand, mouth, legs, eyes, associated movements of hand mouth, highly integrated movements), thymic modifications and hallucinatory manifestations. Topographical organization of the effective area in the cingular gyrus and the relation between the electrical responses and stimulation parameters are studied.

Adolescent↗