Figure 136
Dysembryoplastic neuroepithelial tumor DNET . Horizontal post-contrast T1W image of a child with a DNET. The lesion is based in the cortical and subcortical region of the posterior insula on the left. The lesion has minimal mass effect and a cystlike appearance medially with a posterolateral nodule that follows gray matter signal black arrow . gelastic seizures as well as other types of partial and generalized seizures, including atypical absence and drop attacks 20 . Lesions usually are...
Table 14
Pros and Cons of Genetic Absence Models in Rats Absence Seizure Models in Genetically Prone Rats Spontaneous seizures Good electroclinical correlation to human absences Developmental discrepancy with the onset of human absence seizures Many spontaneous as well as engineered gene mutations were identified in mice and are now an important tool to study epilepsy syndromes, with the information well exceeding the extent of this chapter. Recently, several excellent reviews on this topic have been...
Symptomatic And Cryptogenic Partial Epilepsies In Infancy
Etiologies of symptomatic partial epilepsies in infants include focal cortical dysplasia FCD , pachygyria, poly-microgyria, low-grade dysplastic changes, heterotopic gray matter, schizencephaly, Sturge-Weber syndrome, tuberous sclerosis, hemimegalencephaly, with or without various neurocutaneous syndromes, dysembryoplastic neuroepithelial tumor, ganglioglioma, gangliocytoma, glialneuronal hamartoma, perinatal postnatal insult, and hippocampal sclerosis with or without cortical dysplasia 18,...
Diagnosing The Specific Type Of Pme
Once the clinician is convinced that a patient has the PME syndrome, the critical question is to determine which specific disorder is present. This is essential for proper clinical and genetic counseling of the family see Treatment'' section . It is now possible to provide a specific diagnosis in life for the majority of patients with PME using clinical methods and minimally invasive investigations. An approach to this problem has been described previously. The clinician should first consider...
Info Kap
Kato M, Dobyns WB. X-linked lissencephaly with abnormal genitalia as a tangential migration disorder causing intractable epilepsy proposal for a new term, interneu-ronopathy. J Child Neurol 2005 63 392-397. OMIM National Center for Biotechnology Information NCBI online Human Genome Resources databases human , including Online Mendelian Inheritance in Man, OMIM McKusick-Nathans Institute for Genetic Medicine, Johns Hopkins University, Baltimore, MD , MIM No. 300382. Buoni S, Zannolli R,...
Developmental Changes In Glutamate Neurotoxicity
The immature brain is quite sensitive to neurotoxicity from glutamate and certain of its analogs 33, 60 . Olney discovered a number of years ago that feeding monosodium glutamate to neonatal mice produced characteristic lesions in the hypothalamus 33 . More recently, it has become clear that the receptors that mediate glutamate neurotoxicity respond differently in the immature brain compared with the adult brain. These observations have important implications for the EAA neurotransmitter...
The Gaba System Neuronal Excitability And Seizure Activity
Gamma-aminobutyric acid is the major inhibitory neu-rotransmitter in brain. It has been extensively characterized and plays a major role in regulating neuronal excitability by controlling chloride permeability 23-25 . Specific binding sites for GABA molecules have been identified in neuronal membrane. Although not all GABA receptors are linked to the chloride channel, a large proportion of these receptors are directly involved in regulating chloride channel function. The major inhibitory effect...
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Adapted from Shinnar et al, 1994 53 . Adapted from Shinnar et al, 1994 53 . have not provided information by epilepsy syndrome. The results from our data 53 are shown in Table 29-2. Overall, patients with both idiopathic and cryptogenic epilepsy syndromes have similar prognosis. However, specific syndromes are associated with a differential risk of relapse. Patients with benign rolandic epilepsy have a particularly favorable prognosis, even if their EEGs are still abnormal, whereas all 4 of our...
Ictal Clinical Manifestations
The repertoire of ictal manifestation of epilepsy in infants is limited. Seizures often begin with a change in facial expression or behavior, but the most striking feature is an arrest or marked reduction of behavioral motor activity, which was formerly called a hypomotor seizure 18 . Some authors consider seizures complex partial if nonconvulsive ictal phenomena are associated with disturbance of contact or unresponsiveness and focal or nongeneralized paroxysmal EEG discharges 15, 19 , but...
Exposure To Epileptogenic Stimuli Fever Infection Hypoxia During Development
Infants are exposed to a high risk of epileptogenic stimuli, represented by greater exposure to infectious agents that lead to fever and sometimes to cerebral infections. Neo-nates and infants may also often suffer from perinatal hypoxia ischemia. In susceptible subjects, these stimuli may induce seizures, and because of the higher susceptibility of the young brain to seizures, these seizures occur multiple times a day and may be difficult to control with currently available AEDs 239-245 ....
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135. Ohtahara S. Clinico-electrical delineation of epileptic encephalopathies in childhood. Asian Med J 1978 21 499-509. 136. Chakova L. On a rare form of epilepsy in infants Ohtahara syndrome. Folia Med Plovdiv 1996 38 69-73. 137. Chen PT, Young C, Lee WT, et al. Early epileptic encephalopathy with suppression burst electroencephalograph pattern an analysis of eight Taiwanese patients. Brain Dev 138. Clarke M, Gill J, Noronha M, McKinlay I. Early infantile epileptic encephalopathy with...
Potassium Channels
Potassium channels play a major role in regulating neuronal excitability. Although more than 20 types of potassium channels have been identified by biophysical studies, there are four major groups calcium-activated, voltage-gated, sodium-activated, and inwardly rectifying potassium channels. These different types of potassium channels are regulated by neuromodulators, ions, and second messenger systems. The opening of potassium channels has the effect of hyperpolarizing neurons or reversing...
Reza Behrouz Selim R Benbadis
Idiopathic generalized epilepsies IGEs are a distinct group of epi- lepsies, clearly defined in the 1989 International Classification of Epileptic Syndromes and Epilepsies. This classification established an important dichotomy between the idiopathic epilepsies on the one hand, and the symptomatic or cryp-togenic epilepsies on the other 1 . In prior versions of this classification, IGEs were referred to as primary generalized epilepsies, and symptomatic cryptogenic generalized epilepsies were...
V Antiepileptic Drugs And Ketogenic Diet
Section Editors Blaise F. D. Bourgeois and Raman Sankar Rajesh RamachandranNair and O. Carter Snead, III 543 Kevin Farrell and Aspasia Michoulas 557 42. Carbamazepine and Oxcarbazepine 43. Ethosuximide, Methsuximide, and Trimethadione Gregory L. Holmes and Philip L. Pearl 593 Raman Sankar and W. Donald Shields 611 49. Phenytoin and Related Drugs Dietz Rating, Nicole Wolf, and Thomas Bast 653 Shlomo Shinnar, Richard Civil, and Kenneth W. Sommerville 661 G nter Kr mer and Gabriele Wohlrab 699 55....
Sustained Repetitive Firing Srf
Sustained high-frequency repetitive firing is an important property of vertebrate and invertebrate neurons that correlates with the excitability state of the neuron 6-10 . Many central nervous system CNS neurons exhibit SRF. Although no direct evidence has demonstrated the link between SRF and epilepsy, information from in vitro studies on isolated neurons may have some bearing on altered neuronal excitability and anticonvulsant action. Sustained repetitive firing is a nonsynaptic property of...
T
he International League Against Epilepsy ILAE defined a febrile seizure as a seizure in association with a febrile illness in the absence of a CNS infection or acute electrolyte imbalance in children older than 1 month of age without prior afebrile seizures 1 The temperature associated with the febrile illness must be greater than 38.4 C, although the temperature may not be evident until after the seizure. Prior epidemiological studies have used either one month 2-8 or 3 months 9,10 as the...
Info Rmi
2 3 4 5 6 7 8 Stimulation 400 iA every 2 min 5 10 15 20 25 30 35 40 Stimulation 400 nA 5 10 15 20 25 30 35 40 Stimulation 400 nA
Figure 68
This axial T1 spoiled gradient recalled SPGR MR image shows bilateral periventricular heterotopia in a female with a FLNA mutation, representing a disorder of radial neuronal migration. normal, though specific defects in reading ability have been identified 129 . Less commonly, this condition can occur in males with a similar overall phenotype 128 . Not all females with bilateral PH harbor mutations in FLNA 128 another gene that has been associated with PH is ARFGEF2, described in autosomal...
Drowsiness
r T r r r tmtt-t-v tVH .- VNS 'J 1 jj ,'A n v v,J S Benign myoclonic epilepsy in infancy BMEI . Two-year old female infant with onset before age 1 of myoclonic jerks, who remained untreated until this polygraphic-EEG evaluation at age 2, showing waking and drowsiness. Note the correlation between generalized, irregular spike wave discharges on the EEG and myoclonic jerks shown on the deltoid EMG leads. the reflex forms, or in patients with slightly later onset, after infancy. The jerks may...
Prakash Kotagal
he International Classification of Epilepsies and Epileptic Syndromes I 1 divides epilepsy, first, on the basis of whether the seizures are partial localization-related epilepsies or generalized generalized epilepsies and, second, by etiology idio-pathic, symptomatic, or cryptogenic epilepsy . Idiopathic epilepsies are defined by age-related onset, clinical and electroencephalographic characteristics, and a presumed genetic etiology. Symptomatic epilepsies comprise syndromes based on anatomic...
W Allen Hauser P Nina Banerjee
s a group, the convulsive disorders are among the most frequently occurring neurologic conditions 4 in children. In the United States approximately 5 of children and adolescents experience a seizure of some type by the age of 20 1 . This proportion may be very different in other cultures higher, for example, in Japanese and lower in Chinese or Asian Indians. The greatest proportion of these children experience convulsions only in association with a febrile illness. Only about a quarter of those...
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Source Leary LD, Nordli DR, Jr., De Vivo DC 2006 37 . temperature instability, developmental delay, ptosis, dystonia, and tremors along with seizures. These disorders may not be detected by routine screen for inherited metabolic disorders. If initial metabolic screen and CSF lactate and amino acids are normal in an infant with seizure without clear etiology, profiles of CSF metabolites including biogenic amines should be considered 40 . When gamma-aminobutyric acid GABA -related disorders are...
Info Kvl
46. Donat JF, Wright FS. Seizures in series similarities between seizures of the West and Lennox-Gastaut syndromes. Epilepsia 1991 32 4 504-509. 47. Bonanni P, Parmeggiani L, Guerrini R. Different neurophysiologic patterns of myoclonus characterize Lennox-Gastaut syndrome and myoclonic astatic epilepsy. Epilepsia 2002 43 6 609-615. 48. Smeraldi E, Scorza Smeraldi R, Cazzullo CL, Guareschi Cazzullo A, et al. Immunoge-netics of the Lennox-Gastaut syndrome frequency of HL-A antigens and haplotypes...
Contributors
Distinguished Professor and Sally Reahard Chair Indiana University School of Nursing Indianapolis, Indiana Chapter 66 Quality of Life in Children with Epilepsy Department of Pediatric Neurology Lille University Hospital Pharmacology Laboratory Lille Medical School Lille, France Chapter 58 Inflammation, Epilepsy, and Anti-Inflammatory Therapies Assistant Professor Department of Human Services California State University Fullerton, California Chapter 68 Academic Deficits and Interventions in...
James J Riviello Jr Stavros Hadjiloizou
___ he Landau-Kleffner syndrome I LKS and epilepsy with continuous spikewaves during slow-wave sleep 4 CSWS are recognized as specific epilepsy syndromes by the International League Against Epilepsy ILAE 1-3 . They were first classified as epilepsies and syndromes undetermined as to whether they are focal or generalized 2 . They are now classified as an epileptic encephalopathy, defined as disorders in which the epileptiform abnormalities may contribute to progressive dysfunction 3 . Other...