Abstract
This study aims to determine the risk factors for epileptogenesis and characteristics of seizures in patients with progressive multifocal leukoencephalopathy (PML) who survive more than 1 year from onset of neurological symptoms (PML survivors). We reviewed clinical data including seizure history and MR imaging studies from PML survivors evaluated at our institution between 1997 and 2014. PML progressors who passed away within 1 year and patients with a history of seizures prior to PML diagnosis were excluded from the analysis. Of 64 PML survivors, 28 (44 %) developed seizures. The median time from the onset of PML symptoms to the first seizure was 5.4 months (range 0–159) and 64 % of patients with seizures had them within the first year. The presence of juxtacortical PML lesions was associated with a relative risk of seizures of 3.5 (p < 0.02; 95 % confidence interval (CI) 1.3–9.4) in multivariate analyses. Of all seizure types, 86 % were focal and 60 % most likely originated from the frontal lobes. Among seizure patients, 89 % required treatment, including one (54 %), two (25 %), or three (10.5 %) antiepileptic drugs. Seizures are a frequent complication in PML and can develop throughout the entire course of the disease. However, late onset seizures did not signify PML relapse. Seizures may require treatment with multiple antiepileptic medications and are a significant co-morbidity in PML.
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Authors’ contributions
Dr. Miskin was involved in the conceptualization or design of the study, acquisition, analysis, and interpretation of the data and drafting of the manuscript. Dr. Herman was involved in the conceptualization or design of the study, analysis, and interpretation of the data and drafting and critical revision of the manuscript. Dr. Ngo was involved in the analysis and interpretation of the data, critical revision of the manuscript, and statistical analysis. Dr. Koralnik was involved in the conceptualization of the study, analysis and interpretation of the data, critical revision of the manuscript, obtaining funding, and supervision.
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This study was supported by NIH grants R01NS 047029 and 074995.
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Dr. Miskin reports no disclosures or conflicts of interest. Dr. Herman is funded by NIH grants R01 047029 and 074409; received research grants from UCB Pharma, Sage Pharmaceuticals, Acorda Therapeutics, and the Epilepsy Therapy Development Project; received consulting fees from Eisai, Inc. and Biotie, Inc. Dr. Ngo is funded by NIH grant R01 047029. Dr. Koralnik is funded by NIH grants R01 047029 and 074995; has received a research grant from Biogen Idec and the National Multiple Sclerosis Society; served on scientific advisory boards for Hoffmann La Roche, GlaxoSmithKline, Merck Serono, and MedImmune; received consulting fees from Bristol Myers Squibb, Ono Pharmaceuticals, Merck Serono, Hoffmann La Roche, GlaxoSmithKline, Perseid Therapeutics, Vertex Pharmaceuticals, and Johnson & Johnson; is an Associate Editor for the Annals of Neurology; and receives royalties from UpToDate for topics on the management of HIV and CNS mass lesions and on PML.
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Miskin, D.P., Herman, S.T., Ngo, L.H. et al. Predictors and characteristics of seizures in survivors of progressive multifocal leukoencephalopathy. J. Neurovirol. 22, 464–471 (2016). https://doi.org/10.1007/s13365-015-0414-3
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DOI: https://doi.org/10.1007/s13365-015-0414-3