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

delta9-Tetrahydrocannabinol (THC) was compared with diphenylhydantoin (DPH), phenobarbital (PB) and chlordiazepoxide (CDP) using two electroshock procedures to determine anticonvulsant activity in mice, i.e., electroshock seizure threshold (EST) and the reduced EST caused by hyponatremia (injection of isotonic glucose). Using doses of each drug which were ineffective against MES, only CDP (10.0 mg/kg) was able to raise the EST by 20%. The lowered EST due to hyponatremia was reveresed by al four drugs. In these tests latency to convulsions and lethality associated with electroshock were more sensitive to THC.
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PMID:Comparative activity of delta9-tetrahydrocannabinol, diphenylhydantoin, phenobarbital and chlordiazepoxide on electroshcok seizure threshold in mice. 92 4

Three boys are reported who showed typical autonomic manifestations of hypoglycemia in association with stupor or convulsive seizures two to four hours after eating a meal. During glucose tolerance tests all three children had high peaks in plasma glucose within the first hour and subsequently developed symptoms typical of their clinical disorders on at least one occasion. Two of the boys showed appropriate responses of plasma insulin to oral glucose loading; the third showed a delay in peak plasma insulin. All three children responded promptly and completely to simple dietary management.
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PMID:The prevention of postprandial seizures in children. 93 48

The role of glucose metabolism in alleviating the complications of status epilepticus (SE) was investigated in developing rats. Pretreatment with glucose reduced mortality from SE by 90% in rats under 1 week of age, 80% in 10-day-old rats, 50% in 15- to 20-day-olds, and not at all in adults. In 4-day-old animals, brain DNA synthesis during seizures, and in survivors, brain weight, DNA, RNA, protein, and cholesterol contents at 7 days of age were reduced less in glucose-treated than in saline-treated littermates. In the saline group, seizures caused a progressive fall in brain glucose level but no fall in blood glucose level, suggesting that glucose transport from blood to brain could not keep pace with glycolytic demands. In glucose-treated rats, blood and brain glucose concentrations remained elevated throughout the convulsive period. There was no reduction of brain adenosine triphosphate levels in either group. Thus, the protection by glucose appears to be related to its roles as a carbon source rather than an energy source. It is concluded that in immature animals, depletion of brain glucose can occur in the absence of hypoglycemia, and may be an important and potentially treatable complication of status epilepticus.
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PMID:Status epilepticus in immature rats. Protective effects of glucose on survival and brain development. 99 45

Cerebral blood flow (CBF) and cerebral metablic rate for oxygen (CMRO2) have been studied during sustained epileptic seizures induced by bicuculline (1-2 mg/kg, i.v.) in paralysed Wistar rats, artificially ventilated with nitrous oxide/oxygen. CBF was determined by venous outflow collection, and by 133Xe desaturation, using sagittal sinus blood (for cerebral cortical flow) or retroglenoid venous blood (for 'whole brain' flow). The procedure employed ensured that arterial oxygenation remained normal and blood glucose concentration was normal or high throughout the seizure. Arterial hypotension was prevented by the infusion of donor blood. CBF increased concurrently with seizure onset, reaching a maximum nine times higher than control value after 15-60 s. This was due to a marked rise in mean arterial pressure (to greater than 180 torr) and a dramatic fall in cerebrovascular resistance to less than 15 per cent of control). Subsequently, with decreasing blood pressure, CBF slowly diminished, being more than four times higher than control at 20 min, and slightly less than three times higher than control at two hours. The different procedures for measuring CBF gave closely similar results. A threefold increase relative to control CMRO2 (7-6 ml/100 g-1/min-1 for 'whole brain,' and 10-2 ml/100 g-1/min-1 for cerebral cortex) was measured after 1-20 min of seizure activity (utilizing either the venous outflow or the 133Xe desaturation procedure for CBF determination). After two hours of seizure activity CMR02 was still more than twice as high as the control. This high metabolic rate during sustained seizure activity will increase the susceptibility of the brain to 'ischaemic' damage during prolonged seizures in man in which an additional metabolic stress may be imposed by cerebral hypoxia, arterial hypotension, hyperpyrexia or hypoglycaemia.
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PMID:Cerebral blood flow and metabolic rate early and late in prolonged epileptic seizures induced in rats by bicuculline. 100 Feb 85

Four children had optic nerve hypoplasia with hypopituitarism, and their clinical picture varied with age. The newborn had apnea, hypotonia, seizures, hyopglycemia, and prolong jaundice. The young infant had defective vision, behavioral delay, hypotonia, and seizures. Except for a mildly receding lower jaw and a high-arched palate, the appearance of the patients was not unusual. The fasting blood glucose level was mildly depressed. In two cases the liver was palpable and results of liver function tests were abnormal. The older child, who was blind and mentally retarded, had growth failure. The extent of the pituitary hormone deficiencies was variable, including diabetes insipidus. The septum pellucidum was not invariably absent. Clinical and pathological findings indicate that the brain lesion might be more diffuse than hitherto recognized. Early recognition of this syndrome and timely intervention might diminish serious sequels.
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PMID:Optic nerve hypoplasia with hypopituitarism. Septo-optic dysplasia with hypopituitarism. 111 54

The effect of sodium cyanate (25, 50, 75, and 100 mg/kg body weight i.p. daily for 10 days) upon cerebral metabolism and the EEG of Wistar rats was studied. This treatment resulted in a dose-related carbamylation of hemoglobin and left shift in the oxygen dissociation curve. Animals receiving the highest dose of cyanate developed a significant systemic metabolic acidosis. In brain there was dose-dependent decrease in phosphocreatine, TCO2 and cytoplasmic NADH/NAD+ ratio, reflecting the calculated drop in intracellular pH. Glucose levels were elevated despite a normal calculated energy charge, which suggests a balanced slowing of the energy-producing and energy-utilizing systems. The higher doses of cyanate produced spontaneous seizure activity on the EEG.
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PMID:Effects of high-dose cyanate upon cerebral energy metabolism of the rat. 120 41

Eleven men with disabling reactive hypoglycemia, in a range of 12 to 50 mg per 100 ml, were treated an average of seven years after gastric surgery with a 10 cm reversed jejunal segment. The reversal was placed at the gastric outlet in six patients and just below the ligament of Treitz in five. The former technic produced a somewhat better correction of hypoglycemia than did the latter. A good result was obtained in all eleven and none has had recurrence of seizures or fainting. Whereas the average minimal blood sugar before reversal was 34 mg per 100 ml, after reversal it was increased to 64 mg per 100 ml. The most severe hypoglycemia was noted in a patient after vagotomy and pyloroplasty. We recommend that all patients with dumping syndrome undergo glucose tolerance tests and plasma insulin determinations to ascertain whether they have reactive hypoglycemia. It is our conclusion that introduction of a reversed jejunal segment can control refractory reactive hypoglycemia resulting from previous gastric surgery.
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PMID:Treatment of postoperative reactive hypoglycemia by a reversed intestinal segment. 124 49

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

The diagnosis of bacterial meningitis can be difficult nowadays when antibiotics are freely used in infants and children with fever due to infection, so that a positive smear or culture may be difficult to achieve. In areas where sophisticated methods of diagnosis may be hard to come by, the simple procedure of simultaneously estimating the blood and cerebrospinal fluid (CSF) glucose levels may be helpful in distinguishing bacterial meningitis from viral meningitis. 74 proven cases of bacterial meningitis and aseptic meningitis were investigated prior to treatment. There were 36 cases of bacterial meningitis and 38 cases of aseptic meningitis. The CSF glucose/plasma glucose ratio was calculated for each patient. The cases were divided into two groups; Group A with CSF glucose/plasma glucose ratio of (0.38-2.0) and Group B with CSF glucose/plasma glucose ratio of (0.1-0.35). In Group A, two out of 59 cases died while in Group B, nine out of 15 died (p < 0.01). 44 out of 59 in Group A recovered fully while only two out of 15 in Group B were cured (p < 0.01). It was also found that 54.2% in Group A were admitted in deep coma compared with 86.7% in Group B (p < 0.05) and 25.4% in Group A were admitted with seizures while 66.7% in Group B had convulsion (p < 0.01). Hence, a low CSF glucose/plasma glucose ratio was associated with a poor outcome. The mechanisms responsible for these findings are discussed especially with reference to the blood-brain barrier (BBB).(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:The use of blood glucose/cerebrospinal fluid glucose ratio in the diagnosis of central nervous system infection in infants and children. 130 60

We measured the density of two benzodiazepine (BZ) receptor subtypes in neurosurgically obtained hippocampal tissue from the seizure focus of patients with temporal lobe epilepsy (TLE) showing mesial temporal sclerosis, the most common pathologic finding in TLE. We performed quantitative in vitro receptor autoradiography with [125I]Ro 16-0154, a probe for the central-type BZ receptor and with [3H]PK 11195, a probe for the peripheral-type BZ receptor. In comparison with autopsy and neurosurgical control groups, patients with mesial temporal sclerosis had regionally selective decreased central-type and increased peripheral-type BZ receptors. These changes paralleled regional losses of neurons and proliferation of glia. Decreases of the inhibitory central-type BZ receptor may be a component of the enhanced excitability of the seizure focus and also may allow localization of the focus by in vivo neuroreceptor imaging. Single photon emission computed tomography (SPECT) imaging of two TLE patients with [123I]Ro 16-0154 suggests that this technique may provide a more sensitive means of localizing the seizure focus than current imaging methods relying on changes in blood flow or glucose metabolism.
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PMID:"Central" and "peripheral" benzodiazepine receptors: opposite changes in human epileptogenic tissue. 131 42


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