NEUROLOGY GRAND ROUNDS: PETIT MAL, MYOCLONIC AND AKINETIC SEIZURES, INFANTILE SPASMS.
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The Lennox-Gastaut syndrome (LGS) is a severe epileptic disorder, characterized by developmental delay, typical electroencephalographic pattern and poor control of seizures. This epileptic syndrome generally presents in early childhood but exceptionally starts at the age of 5 years or later. We describe a patient who was classified as late-onset LGS, with evidence of mild hydrocephalus on CT. MRI added new diagnostic information by demonstrating laminar heterotopic grey matter.
Anticonvulsant (AEDs) therapy in adolescence is very difficult because there is no-compliance in this special time of life. Many studies show that the factors that assured good compliance were good motivation, a good therapeutic result, the support of parents, medical and assistance personnel and the positive attitude to the disease and its treatment. Moreover, in recent years, many studies have shown the changes in endocrinology function and weight changes in adolescents after AEDs therapy and after long term therapy with valproate (VPA), carbamazepine (CBZ), gabapentin, felbamate and, topiramate. Abnormalities include weight increase, weight loss, polycystic ovaries and bone disease (osteopenia/osteoporosis, osteomalacia, etc). Thyroid hormone concentrations are involved too. Some study report that the children treated with CBZ may have subclinical signs of hypothyroidism, and these changes are more evident if CBZ is given in association with another drug for example with VPA.
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In April 2004, a group of physicians with an interest in nonconvulsive status epilepticus representing a spectrum of opinion met in Oxford, sponsored by the Epilepsy Research Foundation (a charitable organization), to discuss and debate the definition, diagnosis and treatment of nonconvulsive status epilepticus. We felt that such a meeting would be useful, as nonconvulsive status epilepticus is a subject that provokes strong reactions, perhaps largely due to the relative lack of evidence and the surfeit of opinion. The meeting was arranged such that there were formal talks followed by a discussion led by one of the attendees. We present here the extended abstracts of the main talks with the points raised by the discussants. Despite disagreements on certain issues there was much in the way of consensus. First, it was agreed that nonconvulsive status epilepticus is a term that covers a range of disparate conditions with varying prognoses and treatments. The agreed definition was thus suitably vague, A< >. Secondly, it was agreed that even within a specific condition (e.g. complex partial status epilepticus), the prognosis and treatment depends upon the context in which the condition occurs (e.g. in the critically ill, in coma, in the A< > and in people with prior epilepsy). Perhaps, most importantly it was agreed that we lacked good clinical data, and the challenge was to design good studies for a condition that is underrecognised and often difficult to diagnose.
RATIONALE: Tonic status epilepticus (TSE) in patients with idiopathic generalized epilepsy (IGE) is not well recognized. The objective of this study is to report episodes of TSE in patients with IGE. METHODS: We retrospectively reviewed the clinical and EEG evaluation of three IGE patients who presented TSE. RESULTS: The three patients had mainly clinical features of IGE, but had developed, in addition, focal discharges, diffuse EEG abnormalities and some focal or diffuse neuropsychological dysfunction. The tonic attacks eventually responded to treatment, but were not completely controlled in any of the patients. DISCUSSION: The continuum between IGE and secondary generalized epilepsy is demonstrated in these patients. Most of their clinical and EEG features are however, in keeping with an idiopathic generalized epileptic process with additional focal and diffuse components. Recognition of the significance of TSE in such patients has important therapeutic and prognostic implications. [Published with video sequences].
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