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Epilepsy Behav. 2017 Aug;73:142-147. doi: 10.1016/j.yebeh.2017.04.040. Epub 2017 Jul 18.

Identifying seizure clusters in patients with psychogenic nonepileptic seizures.

Author information

1
Lifespan Biostatistics Core, Rhode Island Hospital, United States; Diagnostic Imaging, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, United States; University of Rhode Island, Department of Psychology, United States. Electronic address: gbaird@lifespan.org.
2
University of Rhode Island, Department of Psychology, United States.
3
Lifespan Biostatistics Core, Rhode Island Hospital, United States; University of Rhode Island, Department of Psychology, United States; Brown University, United States.
4
Brown University, United States.
5
Department of Psychiatry, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, United States; Department of Neurology, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, United States.

Abstract

The present study explored how seizure clusters may be defined for those with psychogenic nonepileptic seizures (PNES), a topic for which there is a paucity of literature. The sample was drawn from a multisite randomized clinical trial for PNES; seizure data are from participants' seizure diaries. Three possible cluster definitions were examined: 1) common clinical definition, where ≥3 seizures in a day is considered a cluster, along with two novel statistical definitions, where ≥3 seizures in a day are considered a cluster if the observed number of seizures statistically exceeds what would be expected relative to a patient's: 1) average seizure rate prior to the trial, 2) observed seizure rate for the previous seven days. Prevalence of clusters was 62-68% depending on cluster definition used, and occurrence rate of clusters was 6-19% depending on cluster definition. Based on these data, clusters seem to be common in patients with PNES, and more research is needed to identify if clusters are related to triggers and outcomes.

KEYWORDS:

Cluster; Outcomes; PNES; Seizures

PMID:
28641165
DOI:
10.1016/j.yebeh.2017.04.040
[Indexed for MEDLINE]

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