Mortality in patients with psychogenic nonepileptic seizures
Abstract
Objective
To investigate the hypothesis that patients diagnosed with psychogenic nonepileptic seizures (PNES) on video-EEG monitoring (VEM) have increased mortality by comparison to the general population.
Methods
This retrospective cohort study included patients evaluated in VEM units of 3 tertiary hospitals in Melbourne, Australia, between January 1, 1995, and December 31, 2015. Diagnosis was based on consensus opinion of experienced epileptologists and neuropsychiatrists at each hospital. Mortality was determined in patients diagnosed with PNES, epilepsy, or both conditions by linkage to the Australian National Death Index. Lifetime history of psychiatric disorders in PNES was determined from formal neuropsychiatric reports.
Results
A total of 5,508 patients underwent VEM. A total of 674 (12.2%) were diagnosed with PNES, 3064 (55.6%) with epilepsy, 175 (3.2%) with both conditions, and 1,595 (29.0%) received other diagnoses or had no diagnosis made. The standardized mortality ratio (SMR) of patients diagnosed with PNES was 2.5 (95% confidence interval [CI] 2.0–3.3). Those younger than 30 had an 8-fold higher risk of death (95% CI 3.4–19.8). Direct comparison revealed no significant difference in mortality rate between diagnostic groups. Among deaths in patients diagnosed with PNES (n = 55), external causes contributed 18%, with 20% of deaths in those younger than 50 years attributed to suicide, and “epilepsy” was recorded as the cause of death in 24%.
Conclusions
Patients diagnosed with PNES have a SMR 2.5 times above the general population, dying at a rate comparable to those with drug-resistant epilepsy. This emphasizes the importance of prompt diagnosis, identification of risk factors, and implementation of appropriate strategies to prevent potential avoidable deaths.
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Information & Authors
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© 2020 American Academy of Neurology.
Publication History
Received: August 18, 2019
Accepted: February 6, 2020
Published online: July 20, 2020
Published in print: August 11, 2020
Authors
Disclosure
R. Nightscales, L. McCartney, C. Auvrez, G. Tao, S. Barnard, and C. Malpas report no disclosures relevant to the manuscript. P. Perucca is supported by an Early Career Fellowship from the National Health and Medical Research Council (APP1163708) and by the Viertel Clinical Investigator Award from the Sylvia and Charles Viertel Charitable Foundation. A. McIntosh and Z. Chen report no disclosures relevant to the manuscript. S. Sivathamboo is supported by the Victorian Medical Research Acceleration Fund and The Royal Melbourne Hospital Neuroscience Foundation. S. Ignatiadis, S. Jones, S. Adams, and M. Cook report no disclosures relevant to the manuscript. P. Kwan is supported by a Medical Research Future Fund Practitioner Fellowship; reports grants and personal fees from Eisai, UCB Pharma, and LivaNova; reports grants from Zynerba, Biscayne, and GW Pharmaceuticals; and has received travel, speaker honoraria, or consultancy fees from Sun Pharmaceuticals, Supernus Pharmaceuticals, Novartis, and Eisai. D. Velakoulis reports no disclosures relevant to the manuscript. W. D'Souza has received travel, investigator-initiated, and speaker honoraria from UCB Pharma; educational grants from Novartis, Pfizer, and Sanofi-Synthelabo; educational, travel, and fellowship grants from GSK Neurology Australia; and honoraria from SciGen Pharmaceuticals. S. Berkovic reports grants from The National Health and Medical Research Council, Eisai, UCB Pharma, and SciGen; has a patent for SCN1A licensed to various diagnostic companies with no financial return, a patent for PRRT2 gene licensed to Athena Diagnostics, and a patent for Diagnostic and Therapeutic Methods for Epilepsy and Mental Retardation Limited to Females (EFMR) licensed to Athena Diagnostics. T. O'Brien reports grants and personal fees from Eisai, UCB Pharma, and Zynerba. Go to Neurology.org/N for full disclosures.
Study Funding
Supported by the National Health and Medical Research Council (APP1091593) and the RMH Neuroscience Foundation.
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I read with interest study by Nightscales et al.1 of mortality in patients with psychogenic nonepileptic seizures (PNES) and the accompanying editorial by Giraldez and Lafrance.1,2 In my personal experience, patients with PNES usually carry multiple other diagnostic labels referable to different organ systems. Many of these diagnostic labels fall under the category of somatoform and conversion disorders. Whether the increased mortality seen in patients with PNES is on account of misdiagnoses of some latent cardiovascular, cerebrovascular, or neoplastic disorder as somatoform or conversion disorder with resultant delayed or inappropriate treatment should be investigated. The fact that overall mortality in the PNES group is 2.5 times the general population emphasizes that these patients should continue to remain in close follow up with both their neurologist and primary care physician after a diagnosis of PNES is made.
Disclosure
The author reports no relevant disclosures. Contact [email protected] for full disclosures.
References
We thank Dr. Sethi for his interest in our article1 and comment. We certainly agree that this group of patients should be evaluated and monitored for cardiovascular, cerebrovascular, or neoplastic disorder. 30.9% of the deaths in our cohort of psychogenic nonepileptic seizures (PNES) patients was due to one of these causes. Patients with PNES are over-represented in lower socioeconomic groups and have high incidence of modifiable risk factors for these disorders, such as smoking, alcohol and drug use, obesity, diabetes, and metabolic syndrome.
Disclosure
The author reports no relevant disclosures. Contact [email protected] for full disclosures.
Reference