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Longitudinal EEG Studies in a Kindred with Lafora Disease

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Longitudinal EEG Studies in a Kindred with Lafora Disease Epilepsia, 32(6):895499, 1991 Raven Press, Ltd., New York 0 International League Against Epilepsy Longitudinal EEG Studies in a Kindred with Lafora Disease C. Yen, A. Beydoun, and I. Drury Department of Neurology, University of Michigan, Ann Arbor, Michigan, U.S.A. Summary: We reviewed 18 EEG studies in four members disease progression, there is increased epileptiform activ- of a family with the Lafora form of progressive myoclonic ity, and a striking change in the spike-wave complexes, epilepsy. Each patient was the product of a consan- with a marked increase in frequency up to 6-12 Hz, and guinous marriage and presented as a teenager with pro- many more short duration polyspike components. Unlike gressive seizures, myoclonus, dementia, and ataxia, and some other forms of secondarily generalized epilepsy, the had biopsy proven disease. The EEG early in Lafora dis- EEG in Lafora disease is distinguished by an increased ease has spike-wave activity resembling that seen in a frequency of the spike-wave complexes with disease primary generalized epilepsy; the background slowing is progression. Key Words: Lafora disease-Seizures- more typical of a secondary generalized epilepsy. With Electroencephalograph y-Genetics. Lafora disease (LD) is a form of progressive my- MATERIALS AND METHODS oclonic epilepsy, characterized by seizures, myoc- All four children were products of consanguinous lonus, dementia, and ataxia, with onset in adoles- marriages; two were brother and sister, and the oth- cence and progression to death within several years ers were first cousins. Each had the typical clinical (Van Heycop Ten Ham, 1968; Schwarz, 1977). features and progressive course of LD, with diag- Most descriptions of the electroencephalogram nosis confirmed by a skin or brain biopsy. Follow- (EEG) in LD have been isolated case reports. One up has been from 2.5 to 9 years; three patients have series (Tassinari et al., 1978) found early EEG died. The principal clinical features are summarized changes similar to those in primary generalized ep- in Table 1. Two illustrative case histories follow. ilepsy, but with progression the development of background slowing, polyspikes, and diffuse and Patient # 1 multifocal spikes. We report the longitudinal EEG An isolated generalized tonic-clonic seizure oc- findings in four members of a kindred with LD. curred at age 12 years in this girl with normal birth These patients had significant EEG findings that and developmental history. In the following year, made discrimination from a primary epilepsy possi- she developed severe behavioral problems, dysar- ble in the early stage of illness. With progression, all thria, and ataxia, as well as poorly controlled ab- developed fast-frequency spike-waves of 10 Hz or sence, myoclonic, and tonic-clonic seizures. She greater, an unusual feature that may be quite dis- became bedridden 4 years after onset. A corpus cal- tinctive in this disorder. losotomy temporarily decreased the seizure fre- quency; the diagnosis of LD was made at that time by a brain biopsy. The patient died 8 years after onset from multiple episodes of aspiration pneumo- Received July 1990; revision accepted October 1990. Address correspondence and reprint requests to Dr. 1. Drury nia. at EEG Laboratory, University of Michigan Medical Center, 1500 E. Medical Center Drive, Ann Arbor, MI 48109-0036, Patient #4 U.S.A. At age 14 years, this girl developed myoclonic This work was presented in part at the 1990 Annual Meeting of jerks of the extremities, but was still doing well in the Central Association of Electroencephalographers and pub- lished as an abstract in Electroencephalogr Clin Neurophysiol school. Birth and developmental history were nor- 1991;78:14 p. mal. A brother had LD. Treatment with valproate 895 896 C. YEN ET AL. TABLE 1. Clinical features in kindred with Lafora disease Age at Patient onset Presenting Seizure Years Number of number Sex (years) symptoms type followed electroencephalograms 1" F 12 Seizure Tonic-clonic, 8 7 myoclonic, absence 2" F 15 Myoclonus Myoclonic, 9 2 tonic-clonic, absence 3" M 15 Seizure Tonic-clonic, myoclonic 5 7 4 F 14 Myoclonus Myoclonic, tonic-clonic 2.5 2 a Deceased. resulted in initial improvement. Over several the background activity that was reactive to eye months, school performance deteriorated and gen- opening in only one case. Trains of irregular, bilat- eralized tonic-clonic seizures developed. Ataxia, erally synchronous 3 Hz spike-wave activity were dementia, and myoclonus have progressed but she seen at times diffusely, and at other times with an is still ambulatory 2.5 years after onset. anterior or posterior emphasis. Two patients had Each patient had an initial EEG within 1 year of EEGs performed in the intermediate stage. Both symptom onset and at least one subsequent EEG. A had increased background slowing (Fig. 2) and in total of 18 studies were performed (range of two to one the frequency of the spike-waves had in- seven) using the International 10-20 system of elec- creased. In the late stage (Fig. 3), there was severe trode placement on 8- to 21-channel instruments, background slowing and a marked increase in the with hyperventilation and photic stimulation per- amount of epileptiform activity. In all cases, this formed routinely. All were obtained in the waking consisted predominantly of 6-12 Hz spike-waves and drowsy states. Each was reviewed for back- and short duration polyspikes, generally synchro- ground frequency and reactivity; the morphology, nous, with a diffuse or posterior emphasis. All pa- location, and frequency of the spike-wave activity; tients had both synchronous and asynchronous ep response to activating procedures; and the presence. ileptiform activity in the occipital areas. We were of independent focal spikes especially in the occip- unable to reliably discriminate independent occipi- ital regions. EEGs were separated according to tal spikes from fragments of the generalized dis- stage of illness defined as early (<I year from on- charges. set), intermediate (1-3 years from onset), or late A photoparoxysmal response was seen inconsis- (>3 years from onset). tently in three patients, although one had a brief generalized myoclonic seizure induced by photic RESULTS stimulation. Hyperventilation was rarely activating. The EEG features are summarized in Table 2. In Myoclonus was also seen, frequently with no elec- the early stage (Fig. l), there was mild slowing of trographic accompaniment. TABLE 2. Electroencephalographic features in Lafora disease Background Spike-wave activity Activation Patient Stage of Predominant Predominant number illness frequency Reactivity Morphology Location frequency Hv Photic 1 Early 7 Single S-W Diffuse 3 + Intermediate 4 Single S-W Posterior 3 - Late 2-3 Single and Posterior 8-10 ND poly s-w 2 Early 4-1 Single S-W Posterior 3 - Late 3-5 Single and Posterior fj-3 ND poly s-w 3 Early 4 Single S-W Diffuse 3 - Late 2-3 Single and Diffuse 8-10 ND poly s-w 4 Early 6 + Single S-W Anterior 3 + Intermediate 4 + Single and Diffuse 10 - poly s-w ND, not done; Hv, hyperventilation; S-W, spike-wave; Hz, Hertz. Epilepsia, Vol. 32, No. 6, 1991 EEG IN LAFORA DISEASE 897 FIG. 1. Patient #l.Early stage, age 12 years, 1 week after first seizure. Electroencephalogram shows mild background slowing and trains of 3 Hz irregular spike-wave activity. DISCUSSION background slowing and both diffuse and focal ep- ileptiform activity. In a later series, Tassinari et a1 The progressive myoclonic epilepsies constitute (1978) described an early stage (first year) of LD one subtype of patients with secondary generalized with EEG features similar to those seen in primary epilepsy (Berkovic et al., 1986), and are a heterog- generalized epilepsy, with normal background ac- enous group that can be distinguished by clinical tivity and in four of six cases 3-5 Hz polyspike-and- features, biopsy findings, and in some patients by wave activity anteriorly. None of our cases demon- particular EEG characteristics. In some early case strated a normal background, although all had an reports of LD (Van Heycop Ten Ham and De Jager, EEG within 1 year of onset; patient 1 was evaluated 1963; Janeway et al., 1967), the EEG pattern was within a week of first seizure, with no medication, thought to be nonspecific and nonprogressive, with and the EEG already had mild slowing. Progressive Fpl-A1 Fp2-A2 F3-AI F4-A2 C3-A 1 C4-AZ P3-A 1 FIG. 2. Patient #4. Intermediate stage, age 16 years, 2 years after onset. Electroencephalogram shows remnants of 3 Hz spike-waves, with faster frequency spike-waves up to 12 Hz. Epilepsia, Vol. 32, No. 6, 1991 ‘?V kB NZA ‘3 868 EEG IN LAFORA DISEASE 899 and the progression to prominent fast spike-wave Chaque patient Ctait issu d’un manage consanguin et a present6 dans l’adolescence I’association progressive de crises, d’un my- complexes over time appears to be unique. oclonus, d’une dtmence et d’une ataxie; le diagnostic de la mal- adie a CtC confirm6 par une biopsie. L’EEG prtsente, a la phase REFERENCES initiale de la maladie de Lafora, un aspect comparable a celui de l’bpilepsie gCntralisCe idiopathique, mais le ralentissement de Berkovic SF, Andermann F, Carpenter S, et al. Progressive my- I’activitC de fond Cvoque davantage I’EEG des epilepsies gCn6r- oclonus epilepsies: specific causes and diagnosis. N Engl J alisCes symptomatiques (EGS). Pendant la progression de la mal- Med 1986;315296-305. adie, les auteurs ont constat6 une augmentation de l’activitt 6p- Drury I, Dreifuss FE. Late-onset Lennox-Gastaut syndrome. ileptique EEG, avec modification importante de la morphologie In: Wolf P, Dam M, Janz D, Driefuss FE, eds. Advances in des PO, qui ont augment6 de frtquence, jusqu’a 6-12 c/s, avec epileptology, 16th Epilepsy Znternational symposium.
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