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Query: UMLS:C0036572 (seizures)
 80,221 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Electroencephalographic activity and extracellular discharges from neurons in deep temporal lobe structures were recorded from fine wire microelectrodes chronically implanted in seven psychomotor epileptic patients for diagnostic localization of seizure foci. In four patients, inhalation of 80 per cent nitrous oxide resulted in loss of consciousness without change in firing rates of temporal lobe neurons (n = 22). In all seven patients, thiopental (400 or 200 mg, iv) decreased limbic neuronal firing rates (n = 38) until the return of wakefulness. In only three of these patients, however, did the firing rates of the neurons (n = 19) decrease significantly (P less than .05). Thiopental suppression of unit activity was not related to systemic hypoxia. This study demonstrates that anesthetic induction with nitrous oxide-oxygen does not significantly affect the firing of neurons in various regions of the human limbic system, which may explain the incidence of patient awareness reported when nitrous oxide-oxygen is administered alone. Thiopental depresses the firing of limbic neurons, and this may account in part for the temporary confusion and amnesia often manifested by patients recovering from the effects of thiopental.
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PMID:Limbic neuronal firing rates in man during administration of nitrous oxide--oxygen or sodium thiopental. 17 77

Naive and pretrained rats were trained in two active avoidance paradigms using a pole-climbing box and in a single-trial passive avoidance task using a T-maze. They were then subjected to amnestic treatments with electroshock, leptazol, pentobarbitone, or ether anesthesia. Single retention tests were given at 20-24, 44-48, or 68-96 h posttreatment. Electroshock and leptazol seizures produced retrograde amnesia in all three paradigms, provided that seizures were maximal and retention was tested before 48 h. Prior treatment with anticonvulsant drugs prevented amnesia. Ether and pentobarbitone anesthesia failed to produce amnesia in all three tasks. A trend of recovery from amnesia was observed in the electroshock and leptazol groups when tested for retention 48-96 h posttreatment. On the other hand, the non-amnesic control, pentobarbitone, and ether groups showed signs of forgetting at these longer intervals. Consolidation failure and/or retrieval block was surmised to be the cause of amnesia; recovery was the possible result of removing the block.
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PMID:Comparative study of retrograde amnesia in rats on active and passive avoidance tasks and spontaneous recovery of memory. 40 59

L-proline induces retroactive amnesia without causing brain seizures or isoelectric activity. 3,4-dehydro-DL-proline, a proline analog containing a double-bond in the 5-membered ring, has similar effects at a smaller dose. Three experiments describe the amnestic qualities of 3,4-dehydro-DL-proline in a chick memory paradigm, the retrograde quality of this amnesia, and its existence in a mammalian (mouse) preparation. Finally, EEG records show that chicks injected with amnestic doses of 3,4-dehydro-DL-proline do not exhibit seizure spiking or abnormal electrical activity.
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PMID:Retrograde amnesia in chicks and mice induced by 3,4-dehydro-DL-proline, a proline analog. 57 97

The diagnostic value of sphenoidal electrode EEG recordings in patients with seizures characteristic for epilepsy with complex partial symptomatology was assessed in a study comprising 404 patients; 71.3% of the patients had seizures with automatisms and amnesia, and 28.7% had psychic seizures with subjective phenomena such as hallucinations and illusions. A total of 59.6% of the patients had diagnostic EEG changes in routine waking or sleep EEG. In sphenoidal EEG recording including thiopenthone activation, diagnostic changes were found in 40.5% of the patients without specific changes in waking or sleep EEG, the chance of a positive finding being more than five times higher in patients with automatisms than patients with psychic seizures. Apart from cases where surgical treatment of temporal lobe epilepsy is considered, sphenoidal electrode EEG recording, including intravenous thiopenthone activation, should be performed in patients with seizure phenomena raising suspicion of epilepsy with complex partial symptomatology but where waking and sleep EEGs fail to demonstrate specific abnormalities.
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PMID:Sphenoidal electrodes: their use and value in the electroencephalographic investigation of complex partial epilepsy. 71 35

A patient was studied who had posttraumatic epilepsy with adversive, psychomotor, and grand mal seizures. During tele-EEG recording from depth electrodes, 4 psychomotor seizures were accompanied by discharge originating in the frontal lobe. The patient sometimes could recall his behavior and believed it to be voluntary. Amnesia was more apt to be total after the seizure than during it.
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PMID:Clinical note: clinical and tele-stereo-EEG findings in a patient with psychomotor seizures. 80 2

Forty-eight patients, 4 to 24 years of age, with recurring absence seizures were studied prospectively for twenty-seven months. Each patient and his EEG were recorded simultaneously by a multicamera videotape technique and each recording was repeatedly viewed and described in writing by two observers who subsequently resolved any differences by joint viewing. From the 48 patients, 374 clinical absence seizures were recorded and classified according to the International Classification of Epileptic Seizures. Automatisms accompanied at least one attack in 88 per cent of the patients. Mild clonic components occurred in 71 per cent, and decreased postural tone in 41 per cent. Only one patient experienced an attack comprising only "blank staring" accompanied by unawareness and amnesia, but 40 per cent of patients exhibited this type of attack in addition to more complex absence attacks. Seizures of ten seconds or less in duration occurred among 85 per cent of patients. Each of the 374 seizures were readily classified according to the International Classification, but simple absence constituted only 9-4 per cent of the seizures. The others most often contained, in order of prevalence, either automatisms, mild clonic components, or decreased postural tone, or a combination of two or more of these features. The relationship between increased duration of the seizures and the occurrence of automatisms was significant. The findings are discussed in relation to differential diagnosis and mechanisms of automatisms. Absence seizures differ from complex partial (temporal lobe, psychomotor) seizures because an aura does not precede the abruptly beginning absence attack, the seizure usually lasts less than ten seconds, and mental clarity returns instantly at the end of the seizure.
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PMID:Simultaneous recording of absence seizures with video tape and electroencephalography. A study of 374 seizures in 48 patients. 118 86

This communication describes a technique of stimulated recall and video replay which has reduced the frequency of seizures in five epileptic patients. Each of the patients had long standing partial epilepsy with complex symptomatology of the psychomotor type. It was generally acknowledged that emotional factors played an important role in their poor seizure control. Previous psychotherapeutic efforts had been without benefit because ictal amnesia had erased the memory of the stressful antecedent message-input which had triggered the seizures. Creation of empathetically stressful responses to presentation of audio and video tape recordings of specific problematic social interactions was sufficient to induce seizures in these patients. Video tape recording of the seizure and the antecedant events provided by means by which the patients could acquire otherwise unrecognized or forgotten information. Once equipped with the identity of the specific emotional trigger, the patient could avoid the kinds of events which might be expected to induce a seizure and be better able to cope with threatening environmental cues when encountered in the future.
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PMID:Identity of emotional triggers in epilepsy. 126 58

A 40-year-old man was admitted after 8 months of speech disturbance and locomotive ataxia. He had no seizures, lightning pains, paresthesia, visual loss, bladder disturbance or rectal incontinence. He had never been neurologically or psychiatrically ill and had no history of syphilis. When the patient was admitted, his general physical examination including blood pressure and dermatologic examination was normal. His consciousness was alert. He was found to have a deterioration of mental status such as inability to concentrate, failing memory, amnesia and circumstantiality. His pupils were anisocoric and Achilles jerks were absent. No rigidity of the neck muscles, paralysis and sensory disturbance were recognized. Romberg's sign was absent. The right pupil was 7.0 mm and the left was 6.0 mm in room illumination. The pupils were nonreactive to bright light and both did not constricted to near stimuli. 0.125% pilocarpine eyedrops produced bilateral pupillary constriction. The results indicated bilateral tonic pupils. Laboratory data revealed white cell count of 12,600/mm3 and normal erythrocyte sedimentation rate of 8 mm/hr. Cerebrospinal fluid (CSF) examination revealed the following: opening pressure, 140 mm of water; cell counts, 76/mm2 (mononuclear cells); total protein, 116 mg/dl; glucose, 57 mg/dl. A serum venereal disease research laboratories (VDRL) test was positive in a 1:32 titer confirmed by positive treponema pallidum hemagglutination (TPHA) test in a 1:40,960 titer and positive fluorescent treponemal antibody-absorption (FTA-ABS) test. Serum TPHA-IgM was positive in a 1:320 titer but TPHA-IgG was negative. CSF examination revealed positive TPHA test (titer of 1:2,560) and positive FTA-ABS test.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[A case of early syphilis presenting general paresis-like symptoms and bilateral tonic pupils]. 130 Feb 74

Our study aimed at analysing effects of epileptic foci on memory function in patients with partial epilepsy. Twenty-eight patients with spontaneous memory complaints and psychometrically established memory disorders were assessed by 21-channel electroencephalography recorded both during cognitive testing and during 99mTc-HMPAO single photon emission computed tomography (SPECT). Computed tomography (CT) was performed on the same day. None of the epilepsy-related factors (seizure type, seizure frequency, type of epilepsy, age at onset of the seizures, type of antiepileptic treatment) could be related directly to severity or type of memory impairment (classified into the categories 'global', 'verbal' and 'non-verbal'). Remarkably, this study found no significant relationship between EEG focus localization and severity of measured memory impairment. Most areas with hypoperfusion on the SPECT were found in the group with global (severe) amnesia, typically with a right frontal localization. Abnormalities on CT were predominantly found in the same group, however, with a right-sided parietal localization. An unanticipated finding was that the majority of temporal CT and SPECT lesions were found in the group with relatively better memory performance.
Seizure 1992 Sep
PMID:Memory complaints, memory disorders and focus localization in patients with partial epilepsy. 134 59

Verbal recent memory disturbance was observed in a patient with a malignant glioma associated with left hippocampal atrophy. A 25 year-old male was admitted because of seizures. CT scan and MRI showed enhanced mass lesions in the left temporal lobe associated with ipsilateral hippocampal atrophy. Neurological examination disclosed right homonymous hemianopsia, word amnesia, alexia, agraphia and acalculia. Neuropsychological examination disclosed verbal recent memory disturbance, which consisted of impaired recall of the precisely memorized words after some interruption. Although hippocampal lesions are known to be often associated with cerebrovascular disease, hippocampal atrophy due to brain tumor is quite unusual. This case suggested that the left hippocampus is closely related to verbal recent memory. Hippocampal atrophy in this case conceivably derived from the decreased arterial flow due to perifocal edema or obstructive hydrocephalus.
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PMID:[A case of malignant glioma associated with verbal recent memory disturbance due to left hippocampal atrophy; case report]. 138 Jun 76


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