Acute seizure risk in patients with encephalitis: development and validation of clinical prediction models from two independent prospective multicentre cohorts

Greta K. Wood, Roshan Babar, Mark A. Ellul, Rhys Huw Thomas, Harriet Van Den Tooren, Ava Easton, Kukatharmini Tharmaratnam, Girvan Burnside, Ali M. Alam, Hannah Castell, Sarah Boardman, Ceryce Collie, Bethany Facer, Cordelia Dunai, Sylviane Defres, Julia Granerod, David W.G. Brown, Angela Vincent, Anthony Guy Marson, Sarosh R. IraniTom Solomon, Benedict D. Michael*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Objective: In patients with encephalitis, the development of acute symptomatic seizures is highly variable, but when present is associated with a worse outcome. We aimed to determine the factors associated with seizures in encephalitis and develop a clinical prediction model. Methods: We analysed 203 patients from 24 English hospitals (2005-2008) (Cohort 1). Outcome measures were seizures prior to and during admission, inpatient seizures and status epilepticus. A binary logistic regression risk model was converted to a clinical score and independently validated on an additional 233 patients from 31 UK hospitals (2013-2016) (Cohort 2). Results: In Cohort 1, 121 (60%) patients had a seizure including 103 (51%) with inpatient seizures. Admission Glasgow Coma Scale (GCS) ≤8/15 was predictive of subsequent inpatient seizures (OR (95% CI) 5.55 (2.10 to 14.64), p<0.001), including in those without a history of prior seizures at presentation (OR 6.57 (95% CI 1.37 to 31.5), p=0.025). A clinical model of overall seizure risk identified admission GCS along with aetiology (autoantibody-associated OR 11.99 (95% CI 2.09 to 68.86) and Herpes simplex virus 3.58 (95% CI 1.06 to 12.12)) (area under receiver operating characteristics curve (AUROC) =0.75 (95% CI 0.701 to 0.848), p<0.001). The same model was externally validated in Cohort 2 (AUROC=0.744 (95% CI 0.677 to 0.811), p<0.001). A clinical scoring system for stratifying inpatient seizure risk by decile demonstrated good discrimination using variables available on admission; age, GCS and fever (AUROC=0.716 (95% CI 0.634 to 0.798), p<0.001) and once probable aetiology established (AUROC=0.761 (95% CI 0.6840.839), p<0.001). Conclusion: Age, GCS, fever and aetiology can effectively stratify acute seizure risk in patients with encephalitis. These findings can support the development of targeted interventions and aid clinical trial design for antiseizure medication prophylaxis.

Original languageEnglish
Article numbere000323
JournalBMJ Neurology Open
Volume4
Issue number2
DOIs
Publication statusPublished - 5 Sept 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 Author(s) (or their employer(s)).

Keywords

  • AUTOIMMUNE ENCEPHALITIS
  • CLINICAL NEUROLOGY
  • INFECTIOUS DISEASES

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