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An Evidence Based Approach to the First Unprovoked Seizure

Published online by Cambridge University Press:  14 September 2018

Samuel Wiebe*
Affiliation:
Department of Clinical Neurological Sciences, University of Western Ontario, and the London Health Sciences Centre London, Ontario, Canada
*
Samuel Wiebe, London Health Sciences Centre, University Campus, 339 Windermere Rd., London, Ontario, Canada N6A5A5
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Abstract:

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The objective is to illustrate the creation and structure of a particular type of Evidence Based Care (EBC) summary that has direct clinical relevance, the Critically Appraised Topic (CAT). The process consists of a step-by-step application of the EBC principles to a common neurological problem, ie., a patient presenting with a first, unprovoked generalized seizure. This includes asking a focused clinical question about prognosis for recurrence and the role of antiepileptic drugs; searching the literature to answer the question; selecting the relevant evidence (a meta-analysis about prognosis and a randomized controlled trial about therapy); appraising the literature for its validity and usefulness; and applying the results to the clinical scenario. The result is a one-page, user friendly CAT whose title states a declarative answer to the clinical question. It also contains a description of the literature search and of the evidence, the clinical bottom lines derived from the evidence, and general comments.

Résumé:

Résumé:

L’objectif de cet article est d’illustrer la création et la structure d’un type particulier de sommaire de soins fondés sur des preuves (evidence-based care – EBC) ayant une pertinence clinique directe, le critically appraised topic (CAT). Le processus consiste à appliquer étape par étape les principes d’EBC à un problème neurologique fréquent, i.e. celui d’un patient qui consulte pour une première crise convulsive généralisée non provoquée. Ce processus inclut: des questions cliniques ciblées sur le pronostic de récidive et le rôle des antiépileptiques; une recherche de la littérature pour répondre aux questions; la sélection des données pertinentes (une méta-analyse sur le pronostic et un essai clinique contrôlé et randomisé sur le traitement); l’évaluation de la littérature quant à sa validité et à son utilité; et l’application des résultats au scénario clinique. Le résultat est un CAT de deux pages, facile à utiliser, dont le titre énonce une réponse à la question clinique. Il contient également une description de la recherche de la littérature et des données, des conclusions cliniques tirées des données et des commentaires généraux.

Type
Review Article
Copyright
Copyright © Canadian Neurological Sciences Federation 2002

References

1. First Seizure Trial Group. Randomized clinical trial on the efficacy of antiepileptic drugs in reducing the risk of relapse after a first unprovoked tonic-clonic seizure. Neurology 1993; 54: 478-483.Google Scholar
2. Annegers, JF, Shirts, SB, Hauser, WA, Kurland, LT. Risk of recurrence after an initial unprovoked seizure. Epilepsia 1986; 27: 43-50.CrossRefGoogle Scholar
3. Baumhackl, U, Billeth, R, Graf, M. Type-specific diagnostic analysis of first epileptic seizure in adults. Eur Neurol 1994; 34 Suppl 1: 71-73.Google Scholar
4. Berg, AT, Shinnar, S. The risk of seizure recurrence following a first unprovoked seizure: a quantitative review. Neurology 1991; 41: 965-972.CrossRefGoogle Scholar
5. Bora, I, Seckin, B, Zarifoglu, M, et al. Risk of recurrence after first unprovoked tonic-clonic seizure in adults. J Neurol 1995; 242: 157-163.CrossRefGoogle Scholar
6. Elwes, RDC, Chesterman, P, Reynolds, EH. Prognosis after a first untreated tonic-clonic seizure. Lancet 1985; 752-753.Google Scholar
7. Forsgren, L, Bucht, G, Eriksson, S, Bergmark, L. Incidence and clinical characterization of unprovoked seizures in adults: a prospective population-based study. Epilepsia 1996; 37: 224-229.Google Scholar
8. Gilad, R, Lampl, Y, Gabbay, U, Eshel, Y, Sarova-Pinhas, I. Early treatment of a single generalized tonic-clonic seizure to prevent recurrence. Arch Neurol 1996; 53: 1149-1152.Google Scholar
9. Gupta, SK, Satishchandra, P, Venkatesh, A, Subbakrishna, DK. Prognosis of single unprovoked seizure. J Assoc Physicians India 1993; 41: 709-710.Google Scholar
10. Hart, YM, Sander, JW, Johnson, AL, Shorvon SD. National General Practice Study of Epilepsy: recurrence after a first seizure. Lancet 1990; 336: 1271-1274.Google Scholar
11. Hauser, WA, Anderson, VE, Loewenson, RB, McRoberts, SM. Seizure recurrence after a first unprovoked seizure. N Engl J Med 1982; 307: 522-528.Google Scholar
12. Hopkins, A, Garman, A, Clarke, C. The first seizure in adult life. Value of clinical features, electroencephalography, and computerised tomographic scanning in prediction of seizure recurrence. Lancet 1988; 1: 721-726.Google Scholar
13. Musicco, M, Beghi, E, Solari, A, Viani, F. Treatment of first tonicclonic seizure does not improve the prognosis of epilepsy. First Seizure Trial Group (FIRSTGroup). Neurology 1997;49:991-998.Google Scholar
14. Olafsson, E, Hauser, WA, Gudmundsson, G. Long-term survival of people with unprovoked seizures: a population-based study. Epilepsia 1998; 39: 89-92.Google Scholar
15. Tardy, B, Lafond, P, Convers, P, et al. Adult first generalized seizure: etiology, biological tests, EEG, CT scan, in an ED. Am J Emerg Med 1995; 13: 15.Google Scholar
16. van Donselaar, CA, Geerts, AT, Schimsheimer RJ. Idiopathic first seizure in adult life: who should be treated? Br Med J 1991; 302: 620-623.Google Scholar
17. van Donselaar, CA, Schimsheimer, RJ, Geerts, AT, Declerck AC. Value of the electroencephalogram in adult patients with untreated idiopathic first seizures. Arch Neurol 1992;49:231-237.Google Scholar
18. Wolf, P. Non-medical treatment of first epileptic seizures in adolescence and adulthood. Seizure 1995; 4: 87-94.Google Scholar
19. Guyatt, GH, Sackett, DL, Cook, DJ. Users’ guides to the medical literature. II. How to use an article about therapy or prevention. A. Are the results of the study valid? Evidence-Based Medicine Working Group. JAMA 1993; 270: 2598-2601.Google Scholar
20. Guyatt, GH, Sackett, DL, Cook, DJ. Users’ guides to the medical literature. II. How to use an article about therapy or prevention. B. What were the results and will they help me in caring for my patients? Evidence-Based Medicine Working Group. JAMA 1994; 271: 59-63.Google Scholar
21. Oxman, AD, Cook, DJ, Guyatt, GH. Users’ guides to the medical literature. VI. How to use an overview. Evidence-Based Medicine Working Group. JAMA 1994; 272: 1367-1371.Google Scholar
22. Chalmers, TC, Celano, P, Sacks, HS, Smith, H. Bias in treatment assignment in controlled clinical trials. N Engl J Med 1983; 390: 1358-1361.Google Scholar
23. Laupacis, A, Sackett, DL, Roberts, RS. An assessment of clinically useful measures of the consequences of treatment. N Engl J Med 1988; 318: 1728-1733.CrossRefGoogle Scholar
24. North American Symptomatic Carotid Endarterectomy Trial Collaborators. Beneficial Effect of Carotid Endarterectomy in Symptomatic Patients with High-grade Carotid Stenosis. N Engl J Med 1991; 325: 445-453.Google Scholar