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Biomedical subjects

B B Lyon

Publications and source records attributed to B B Lyon.

13 recordsLinked to original sources
PubMed1995

Cognitive function and anticonvulsant therapy: effect of monotherapy in epilepsy.

INTRODUCTION: The effect of antiepileptic drugs (AED) on cognitive function was studied in 87 patients with epilepsy. MATERIAL AND METHODS: Group A: (n = 52) started AED treatment (carbamazepine, oxcarbazepine, sodium-valproate, phenobarbital or phenytoin). Group B: (n = 27) had AED monotherapy withdrawn (carbamazepine or sodium-valproate). Group C: (n = 8) was switched from phenytoin to carbamazepine monotherapy. The patients were tested before and 4 months after change of the treatment. RESULTS: In group A the test performances were in general unchanged. Patients who had their drug treatment withdrawn (group B) and the patients who were switched from phenytoin to carbamazepine (group C) improved in single tests. The predominant changes in performance seem to be due to practice effect. CONCLUSION: Cognitive functions are only minimally influenced by AEDs after short-term treatment whereas there is a slight improvement after discontinuation of long-term administration of carbamazepine and valproate. A lack of practice effect might be the first indicator of a negative effect of AED on cognitive function.

Adolescent↗
PubMed1994

[Preoperative EEG in medically intractable epilepsy].

The aim of the preoperative neurophysiological investigations is to identify the primary epileptogenic focus and its relation to functional cortical areas. The investigations include interictal and ictal extracranial (scalp) electroencephalography (EEG) and invasive methods (depth, subdural, foramen ovale electrodes and peroperative electrocorticography). If an epileptic focus is located in the anterior part of the temporal lobe by the use of scalp EEG, this is normally regarded as sufficient for an anterior lobectomy. However, because of poor spatial resolution by scalp EEG, it is difficult to separate mesial from lateral foci, identify the exact extent of posterior temporal or extra-temporal foci, identify the primary focus in patients with bilateral abnormalities and identify cases with minor scalp EEG-changes. As invasive EEG shows higher spatial resolution and gives an opportunity to evaluate functional areas, invasive EEG has significant advantages in these patients. Use of invasive EEG bears a slightly increased risk and discomfort to the patient, but is necessary in the presurgical evaluation of some patients suffering from medically intractable epilepsy.

Electroencephalography↗
PubMed1991

Central nervous system reactions to cervical myelography.

In a double blind prospective study of side effects to cervical myelography 38 patients were evaluated with neurologic examination, electroencephalography (EEG), brainstem evoked response (BER), somatosensory evoked responses (SSER), and continuous reaction times prior to and at 6 h and 24 h after myelography with either metrizamide or iohexol. A difference in the incidence of side effects (for example headache, dizziness, nausea, and neck pain) to the two different contrast media indicated that the inconveniences related to myelography were not only due to the spinal puncture. A contrast medium effect on the central nervous system varying from one agent to another was present. A high frequency of EEG deteriorations among patients with adverse clinical reactions and on only discrete affection upon BER indicated the reaction to be located to the cerebral cortex. Weakened tendon reflexes and reduced strength in the upper extremities were probably caused by blockade in the motor roots as SSER were normal indicating no affection of the sensory pathways. This hypothesis is in agreement with the fact that the patients were in the prone position in the first phase of the investigation causing the highest concentration of contrast medium around the motor roots and the anterior part of the spinal cord. Difference in metabolic effect may explain differences in side effects of metrizamide and iohexol.

Adult↗
PubMed1983

Progabide: a controlled trial in partial epilepsy.

Progabide (SL 76002) was studied in a randomized double-blind crossover trial using 20 outpatients suffering from partial complex seizures. Progabide was added to the concomitant antiepileptic treatment in a fixed dosage schedule. The design included an open therapy control unit. No significant difference was established between the number of partial seizures during treatment with progabide and placebo. A trend was observed for lower seizure frequency of secondary generalized seizures during treatment with progabide. Only mild and transient side effects were observed. There was no difference between the side effects of progabide and placebo.

Anticonvulsants↗
PubMed1983

Gamma-vinyl-GABA: a single-blind trial in patients with epilepsy.

The anti-epileptic effect of gamma-vinyl-GABA (GVG) was studied using a placebo-controlled, single-blind design in 15 patients with therapy-resistant epilepsy, the majority experiencing complex partial seizures. GVG was added to concomitant treatment, which was kept at constant serum levels. Following administration of 1 g, 2 g and 3 g per day, significant reductions in seizure frequency were observed. A poor correlation was found between GVG serum levels and clinical effect. Only mild and transient side-effects were observed.

Adolescent↗
PubMed1979

Carbamazepine vs phenytoin. A controlled clinical trial in focal motor and generalized epilepsy.

The antiepileptic effects of carbamazepine and phenytoin were compared in a double-blind crossover trial studying patients with primary and secondary generalized seizures and partial seizures with motor symptoms. Each treatment period lasted ten weeks. The patients were seen every two weeks, and doses were adjusted according to plasma levels. It was attempted to keep levels in the optimal plasma range, ie, 10 to 20 and 4 to 10 mg/liter for phenytoin and carbamazepine, respectively. Twenty-three patients entered and 19 completed the study. No statistically significant differences were found between carbamazepine and phenytoin with regard to seizure control and acute side effects.

Adolescent↗
PubMed1978

Penicillamine-induced polymyositis-dermatomyositis.

Two patients with classical rheumatoid arthritis developed myopathy during treatment with penicillamine. In both patients, electromyography and muscle biopsies were indicative of polymyositis. In one patient, muscle enzymes were not examined at the appropriate time; in the other patient muscle enzymes were raised. This latter patient also had a rash and, in the dermal epidermal junction of pathological skin, granular deposits of immunoglobulin and complement were found. The myopathy subsided in both patients after withdrawal of penicillamine.

Action Potentials↗
PubMed1975

Peripheral nerve injury as a complication of axillary arteriography.

Five patients with peripheral nerve injury after axillary arteriography are presented. The clinical and electromyographic pictures of this complication are described. In 4 patients the brachial plexus was damaged due to haematoma or pseudoaneurysm-formation at the site of the arterial puncture. The grave prognosis for this complication is illustrated on the basis of the literature and our cases. Since it is concluded that the prognosis is better if rapid surgical correction of the complication is performed, certain steps to prevent the disabling outcome are proposed.

Adolescent↗
PubMed1975

Peripheral nerve involvement in Batten-Spielmeyer-Vogt's disease.

Electromyography and sensory and motor nerve conduction were studied in 23 patients with Batten-Spielmeyer-Vogt's disease ("juvenile amaurotic idiocy", cerebral ceroidlipofuscinosis). A slight to moderate slowing of the sensory conduction velocity was found in the median as well as in the sural nerve, more pronounced in the distal than in the proximal segments. The findings are interpreted as evidence of impaired transmission of the peripheral nerves in Batten-Spielmeyer-Vogt's disease.

Adolescent↗