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Biomedical subjects

O Devinsky

Publications and source records attributed to O Devinsky.

At least 55 records · Page 3Linked to original sources
PubMed1998

Interhemispheric memory transfer in the intracarotid amobarbital procedure.

The authors examined interhemispheric memory transfer in 32 patients with lateralized temporal lobe complex partial epilepsy (15 right onsets, 17 left onsets). Visually presented verbal, nonverbal, and two types of dually encodable stimuli were displayed during amobarbital anesthesia, and recognition memory was tested with verbal and nonverbal (pointing) response modalities. No relationship was found between the material specificity of stimuli and response modality. The only significant findings were for poorer recognition memory after injection of the hemisphere contralateral to the seizure focus. Visual information presented predominantly to one hemisphere during anesthesia is available to the other hemisphere for recognition memory on clearing.

Adult↗
PubMed1998

Olfactory reference syndrome in a patient with partial epilepsy.

A 49-year-old man with right temporal lobe epilepsy developed the chronic delusion that his body emitted a foul odor (olfactory reference syndrome). Before the delusional symptoms, he had partial seizures with unpleasant olfactory hallucinations. Subsequently ictal olfactory symptoms abated but a disabling delusional syndrome developed. The only prior case of the olfactory reference syndrome in a patient with epilepsy had a right frontal lesion. The case further supports the association of right hemisphere lesions and delusional disorders.

Epilepsy, Temporal Lobe↗
PubMed1997

Serial recovery of language during the intracarotid amobarbital procedure.

There is considerable variability among epilepsy centers in the methods and interpretations of the intracarotid amobarbital procedure. Prominent among these differences is the determination of language representation and assessment of language functions. Some centers rely on speech arrest following amobarbital injection as a marker for language representation, whereas other centers examine verbal output for the presence of aphasic errors. The present study assessed the pattern of language recovery following amobarbital injection in epilepsy patients who were candidates for temporal lobectomy. Language recovery from dominant hemisphere injection (left or right) followed a stereotypical progression, with 71.8% of patients showing return of vocalization followed by return of naming and comprehension. Repetition deficits with paraphasic errors persisted the longest (mean = 12'30"), with a conduction aphasia persisting after the acute global aphasia resolved. Although two patients interpreted as left hemisphere language dominant were mute following right hemisphere injection, all language functions were intact immediately upon resumption of vocalization and they showed no other signs of aphasia such as paraphasias or anomia. Possible explanations for serial language recovery and persistent conduction aphasia are discussed. These findings have significant implications for the determination of cerebral language dominance.

Adult↗
PubMed1997

Dissociation in epilepsy and conversion nonepileptic seizures.

PURPOSE: We examined the dimensionality of the item content of the Dissociative Experiences Scale (DES) in relation to the clinical diagnosis of conversion nonepileptic seizures (C-NES) versus complex partial epilepsy (CPE). METHODS: The DES was administered to a sex- and age-matched sample of 132 patients with C-NES and 169 with CPE and was factor analyzed with principal components analysis (PCA) with varimax rotation. RESULTS: The mean total DES score was 15.1 in the C-NES group and 12.7 in the CPE group (p = 0.079). The factors obtained by PCA differentiated the CPE and C-NES groups more strongly than did the total DES score. The factor accounting for the most variance, interpreted as "depersonalization-derealization," was significantly greater in C-NES than CPE (p = 0.005). An "absorption-imaginative involvement" factor, which included some of the clinical features of posttraumatic stress disorder was elevated only in subjects reporting histories of childhood abuse (p = 0.001) regardless of the diagnosis of CPE or C-NES. An "amnestic" factor appearing to represent memory problems related to neurologic impairment showed a trend toward elevation in CPE (p = 0.056) and may have confounded the CPE versus C-NES distinction using total DES scores. CONCLUSIONS: The DES has separate underlying dimensions that appear to relate distinctively to depersonalization and derealization, childhood trauma, and neurologic impairment. The heterogeneous item content of the DES is a potential confound that should be appreciated when this instrument is used to study dissociation in neuropsychiatric populations.

Adult↗
PubMed1997

Bradycardia and asystole induced by partial seizures: a case report and literature review.

Bradyarrhythmias associated with partial seizures are uncommon, with most reported patients having temporal lobe seizure foci on scalp EEG recordings. We report a patient with bradycardia and sinus arrest during a complex partial seizure documented during bilateral subdural EEG and EEG and simultaneous video and EEG recordings. The seizure began in the left temporal lobe and spread to the right temporal region, with bradycardia occurring 55 seconds after ictal onset and asystole after 60 seconds.

Adult↗
PubMed1997

Frontal functions in juvenile myoclonic epilepsy.

The authors investigated cognition in juvenile myoclonic epilepsy (JME), focusing on frontal functions as suggested by maximal spatial distribution of epileptiform activity seen over frontocentral regions. Fifteen patients with JME (mean age, 34.3 years; mean estimated IQ 101) were administered a battery of tests sensitive to frontal dysfunction. The number of patients with impaired test performance and the frequency of impairment per test were calculated. Performance on selected tests was compared with that of 15 patients with temporal lobe epilepsy (TLE) who were matched for estimated IQ using paired t-tests. Although the performance of the group with JME was not uniform--some patients showed marked impairment whereas others showed little or no deficit--a high frequency of impairment was found on tests of concept formation-abstract reasoning and mental flexibility, cognitive speed, and planning and organization. Significant differences were found between the group with JME and the group with TLE on tests requiring mental flexibility and concept formation-abstract reasoning. In conjunction with studies demonstrating intractable seizures in approximately 20% of patients, the results from this study suggest that JME is not a uniformly benign condition. Frontal deficits may have maladaptive behavioral consequences suggestive of personality dysfunction, as described anecdotally by previous investigators.

Adolescent↗
PubMed1996

Clinical features of neocortical temporal lobe epilepsy.

Few studies have examined the clinical features of neocortical temporal lobe epilepsy (NTLE) in carefully selected patients. We reviewed records from 21 patients with NTLE, defined by intracranial electroencephalogram (EEG), who have been seizure free for 1 year or more following temporal lobectomy. The mean age of onset at the time of first seizure was 14 years (range, 1-41 years). Febrile seizures were reported in only 2 patients (9.5%). In contrast to prior mesial temporal lobe epilepsy (MTLE) studies, seizure-free intervals between the initial cerebral insult or first seizure and habitual seizures were uncommon. Possible or known risk factors for epilepsy were reported in 13 of 21 patients (62%). Fifteen (71%) patients reported auras, with experiential phenomena being the most common type. Magnetic resonance imaging was normal or nonspecific in 15 patients, revealed mild hippocampal atrophy in 2, tumors in 2, and heterotopic gray matter and hippocampal atrophy in 1, and cortical dysgenesis in 1. Neuropsychological testing showed deficits consistent with the seizure focus in 13 patients (62%), and Wada test showed ipsilateral memory deficits in 10 (48%). The most common behavioral manifestation was a motionless stare at ictal onset (48%). In contrast to prior studies of MTLE, only 1 NTLE patient had frequent independent, contralateral temporal lobe epileptiform spikes on scalp EEG.

Adolescent↗
PubMed1996

A comparison of health-related quality of life in patients with epilepsy, diabetes and multiple sclerosis.

The purpose of this investigation was to compare self-reported health-related quality of life (HRQOL) in epilepsy compared to another neurological condition or a non-neurological chronic illness. Patients with epilepsy (N = 271), multiple sclerosis (N = 85) and diabetes (N = 555) completed a generic measure of HRQOL (RAND 36-Item Health Survey 1.0 (SF-36)), and the eight SF-36 scale scores were compared across groups, adjusting for differences in sociodemographic characteristics and co-morbid medical conditions. Patients with multiple sclerosis reported significantly worse HRQOL compared to both the epilepsy and diabetes groups (who did not differ from one another) on the Physical Functioning, Role Limitations-Physical, Energy, and Social Function scales. Patients with epilepsy and multiple sclerosis did not differ from one another but reported significantly lower HRQOL scores than the diabetes group on the Emotional Well-Being and Role Limitations-Emotional scales. However, the epilepsy group reported better health perceptions compared to the diabetes and multiple sclerosis patients. Generic measures of HRQOL appear useful in identifying some effects of neurological disease, but disease-targeted supplements may be required to more clearly identify the impact of epilepsy on quality of life.

Adult↗
PubMed1996

A brief questionnaire to screen for quality of life in epilepsy: the QOLIE-10.

PURPOSE: To evaluate a brief questionnaire to screen aspects of health-related quality of life for persons with epilepsy. METHODS: A study of 304 adults with epilepsy was undertaken at 25 seizure clinics in the United States. It was used for derivation of a brief screening tool from a longer instrument (QOLIE-89). RESULTS: The 10-item questionnaire (QOLIE-10) covers general and epilepsy-specific domains, grouped into three factors: Epilepsy Effects (memory, physical effects, and mental effects of medication), Mental Health (energy, depression, overall quality of life), and Role Functioning (seizure worry, work, driving, social limits). Scale scores were significantly different among seizure groups (p = 0.003). CONCLUSIONS: The QOLIE-10 can be completed by a patient in several minutes and reviewed rapidly by the physician. This screening tool could provide potentially useful information for initial assessment or follow-up of problem areas that are not commonly evaluated during routine clinical visits with patients with epilepsy.

Adolescent↗
PubMed1996

Clinical profile of patients with epileptic and nonepileptic seizures.

Epileptic seizures (ES) and nonepileptic seizures (NES) often coexist in patients with treatment-refractory seizures. There are few data on ictal features of these different seizure types in the same patient. We identified 20 patients with ES from a group of 99 NES patients (ES/NES) and compared this group with patients with only ES or NES. All 20 ES/NES patients developed NES after ES. Clinical features of NES clearly differed from ES in 18 of 20 cases. In patients with ES/NES their ES were similar to seizures in patients with only ES, and their NES were similar to spells in patients with only NES. ES/NES patients were similar to ES patients in electrodiagnostic and neuroimaging studies, and similar to NES patients in psychiatric interviews and inventories. The clinical manifestations of ES and NES in the same patient are usually different. Both types of events may be stereotypic and can be distinguished and characterized during video-EEG recording. Determining what events are more prevalent or disturbing is critical. Psychiatric and antiepileptic drug treatment may be provided accordingly.

Amnesia↗
PubMed1995

Psychiatric classification of nonconversion nonepileptic seizures.

OBJECTIVE: To determine the frequency and type of non-conversion nonepileptic seizures (NES). BACKGROUND: Although conversion disorder is the most common psychiatric disorder among patients with NES, many patients with nonepileptic paroxysmal behavioral events have other psychiatric disorders, with natural histories and treatments different from those of conversion disorder. DESIGN: Retrospective review of a series of consecutive admissions for video-electroencephalography monitoring. All patients identified with NES were interviewed by a psychiatrist. Patients with conversion and other psychiatric disorders were divided into separate groups. SETTING: A comprehensive epilepsy center. RESULTS: Twenty-one patients evaluated for possible epileptic seizures had a psychiatric disorder other than conversion that accounted for their events. Among these patients, Diagnostic and Statistical Manual of Mental Disorders, Revised Third Edition (DSM-III-R) anxiety disorders (n = 9) were the most common diagnosed category, followed by all forms of psychotic disorders (n = 7) and impulse control problems in the setting of attention deficit disorder residual type (n = 2). In contrast to 71 patients with conversion NES seen over the same period of time, the non-conversion group showed no female predominance and the nonconversion patients were significantly less likely than the conversion patients to have been physically or sexually abused in childhood or adolescence. CONCLUSIONS: These results support the validity of the nosologic distinction of nonconversion from conversion NES and suggest that DSM-III-R anxiety disorders are an important diagnostic confound in clinical epilepsy.

Conversion Disorder↗
PubMed1995

Correlates of arterial-filling patterns in the intracarotid amobarbital procedure.

OBJECTIVE: To determine behavioral correlates of anterior cerebral artery (ACA) and posterior cerebral artery (PCA) perfusion patterns in the intracarotid amobarbital sodium procedure. DESIGN: Multivariate analysis of covariance and partial correlations of behavioral measures to ACA crossflow and PCA filling. SETTING: Angiography and the intracarotid amobarbital procedure at a comprehensive epilepsy center. SUBJECTS: Forty-two patients with intractable epilepsy (right-hemisphere seizure focus [n-23]; left-hemisphere seizure focus [n = 19]). MEASUREMENTS: Internal carotid angiography was performed both at a standard injection rate (8 mL of contrast per second) and at 1 mL/s, which matched the rate of the subsequent amobarbital injection. The degree of ipsilateral PCA and contralateral ACA filling were graded on a seven-point scale and compared with postinjection behavior, language, and memory measures. RESULTS: The ACA crossflow did not correlate significantly with that of any measure. The degree of PCA-filling pattern correlated significantly only with the level of consciousness (r = .31, P < .004), but it was not significant after accounting for the effects of seizure laterality, injection side, and amobarbital dosage. Neither ACA crossflow nor PCA filling correlated significantly with memory. The degree of ACA and PCA filling was overestimated at standard angiography (8 mL of contrast medium per second) injection rates. CONCLUSIONS: Although the degree of PCA filling correlates mildly with the level of consciousness postinjection, possibly by perfusion of thalamic or mesencephalic branches, it is not reliably predictive and is less contributory than the injection side and seizure laterality. The PCA filling is not required to produce valid memory assessment in the intracarotid amobarbital procedure, and ACA crossflow is not predictive of behavioral responses.

Adult↗
PubMed1995

The relationship of neuropsychological functioning to quality of life in epilepsy.

OBJECTIVE: To examine the relationship of objectively assessed cognitive functioning to self-reported quality of life. DESIGN: Correlational, multiple regression, and factor analytic comparisons of a new self-report quality of life inventory with neuropsychological tests of cognition and mood. SUBJECTS: Two hundred fifty-seven patients with epilepsy. SETTING: Twenty-five epilepsy centers and neurology clinics across the United States. MEASURES: A recently developed self-report (ie, Quality of Life in Epilepsy-89 inventory) and objective tests of memory, verbal abilities, spatial functions, psychomotor and cognitive processing speed, cognitive flexibility, and mood. RESULTS: Factors that assessed mood, psychomotor speed, verbal memory, and language correlated significantly with selected scales of the Quality of Life in Epilepsy-89 inventory (P < .0001) and were predictive of overall quality of life (P < .002 to P < .0001). The mood factor showed the highest correlations (r = -.20 to r = -.73) and was the strongest predictor of quality of life in regression analyses (46.7% explained variance, P < .0001). CONCLUSIONS: Mood may be adversely affected by diminished quality of life, or perceived quality of life may be affected by mood disturbance. Quantitative quality of life assessments can be used in conjunction with formal neuropsychological testing of mood and cognition when evaluating patients with epilepsy.

Adult↗
PubMed1995

Safety of intravenous valproate.

This multicenter, open-label trial was designed to study the safety of intravenous (IV) sodium valproate in patients with epilepsy. All 318 patients (previously treated with antiepileptic drugs) were hospitalized for seizure control or anticipated seizures. The protocol allowed physicians to set the number of infusions and treatment duration. Adverse events, laboratory studies performed, and seizure activity were documented on case report forms. The patients' mean age was 34.4 years (range, 2-87 years). The most common reason for admission was lack of seizure control (235 patients, 185 of whom were admitted for video-electroencephalographic monitoring). The median dosage of valproate was 375 mg infused over 1 hour. The median number of doses was four, given over 2 days. In 54 patients (17%), transient adverse events were reported. The most frequent were headache, reaction at the injection site, and nausea (2.2% each); somnolence (1.9%); vomiting (1.6%); and dizziness and taste perversion (1.3% each). No persistent or severe hematologic or serum chemistry abnormalities were found. Vital signs were not significantly affected by the IV infusion of valproate. At the dosages and rates of administration studied, intravenous valproate appears to be safe and well tolerated.

Adolescent↗
PubMed1995

Anatomic and physiological considerations in pallidotomy for Parkinson's disease.

Our ongoing study of ventral pallidotomy for the control of Parkinson's disease in selected patients has provided the opportunity to explore the topographical and somatotopic organization of the human globus pallidus. Utilizing microelectrode techniques we have obtained recordings which were correlated with data from MPTP-parkinsonian primates. In addition, we performed pre- and post-operative FDG/PET scans in these patients. Our studies reveal similarities between the MPTP-parkinsonian primate model and human Parkinson's disease in terms of physiologic recordings and responses. However, we have encountered significant differences between dominant and non-dominant hemisphere representations, particularly for the hand, in the human. In addition, our PET studies confirmed, as in previous parkinsonian primate models, glucose hypermetabolism in the lenticular area of Parkinson's disease patients. This hypermetabolism is dramatically altered by creation of a lesion in the globus pallidus medialis. This is demonstrated by follow-up PET scans which reveal not only a decrease in metabolism of the operated lenticular region, but also in the frontal cortical projections. These combined observations of the cellular activity in the globus pallidus and the observed changes in PET metabolism support the selection of the pallidum for lesioning and control of Parkinson's disease, and offer insight into the underlying physiology of this disorder. The above physiological and PET data will be clinically correlated with our ongoing series of 35+ patients.

Brain Mapping↗