Evidence map›Paper›PMID 42446501›Full record

ArticleEpilepsia2026

New onset refractory status epilepticus (NORSE) versus refractory status epilepticus not meeting NORSE criteria: A comparative clinical and electroencephalography-based study.

Seren Hawksworth, Nina Moutonnet, Gregory Scott, Sanjeev Rajakulendran, Mahinda Yogarajah, Matthew C Walker, Umesh Vivekananda

Abstract readComparative Study
In one paragraph

Article in Epilepsia, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Seren HawksworthUniversity College London Queen Square Institute of Neurology, London, UK.ORCID https://orcid.org/0009-0002-6616-9266
Nina MoutonnetImperial College London, UK Dementia Research Institute, London, UK.
Gregory ScottImperial College London, UK Dementia Research Institute, London, UK.
Sanjeev RajakulendranUniversity College London Queen Square Institute of Neurology, London, UK.
Mahinda YogarajahUniversity College London Queen Square Institute of Neurology, London, UK.ORCID https://orcid.org/0000-0003-3509-3756
Matthew C WalkerUniversity College London Queen Square Institute of Neurology, London, UK.ORCID https://orcid.org/0000-0002-0812-0352
Umesh VivekanandaUniversity College London Queen Square Institute of Neurology, London, UK.ORCID https://orcid.org/0000-0001-6116-2335

Funding

Wellcome Trust
6 · The paper itself

Abstract

objectiveNew onset refractory status epilepticus (NORSE) is a rare, severe presentation of refractory status epilepticus (RSE), with approximately half of cases cryptogenic NORSE (c-NORSE). We compared electroencephalographic (EEG) findings alongside clinical features between NORSE and RSE not meeting NORSE criteria to better understand outcomes and prognostication.

methodsThis retrospective cohort study analyzed 81 RSE patients admitted to the intensive therapy unit (ITU) at the National Hospital for Neurology and Neurosurgery and University College London Hospital (2007-2023). Patients were categorized as RSE not meeting NORSE criteria (n = 52) or NORSE (n = 29). EEG features, treatment, and outcomes (ITU stay, mortality, cognitive outcome, and antiseizure medication [ASM] use), were evaluated.

resultsOf 29 NORSE patients (15 c-NORSE, 51.7%; 14 etiology-identified NORSE, 48.3%), autoimmune (20.7%) and infectious (17.2%) etiologies were most prevalent. Six-month mortality was higher in c-NORSE than etiology-identified NORSE (20.0% vs. 7.1%), but similar between NORSE and RSE not meeting NORSE criteria (13.8% vs. 21.1%). EEG analysis revealed longer seizure duration (mean = 243.38 vs. 51.67 s, p < .001), a tendency to higher seizure frequency (.013 vs. .009 seizures/min, p = .076), and increased presence of generalized periodic epileptiform discharges and stimulus-induced rhythmic, periodic, or ictal discharges in NORSE than RSE not meeting NORSE criteria. Across all patients, higher initial seizure burden correlated with longer ITU admissions and worse outcomes. Compared with RSE not meeting NORSE criteria, NORSE patients had longer ITU stays (median = 51 vs. 11 days, p < .001), more ASMs (mean = 3.91 vs. 2.00, p = .031), greater sedative use (mean = 2.17 vs. 1.00, p < .001), and more frequent cognitive impairment at discharge (88.9% vs. 62.2%, p = .037). SIGNIFICANCE: NORSE, particularly c-NORSE, tends to follow a more severe course than RSE not meeting NORSE criteria, with more severe background EEG features including the initial EEG, greater seizure burden, longer ITU stays, and increased incidence of cognitive impairment at discharge. Six-month mortality was similar, implying additional contributing factors to mortality.

Indexed as

Drug Resistant EpilepsyElectroencephalographyStatus EpilepticusAdultAgedAnticonvulsantsFemaleHumansMaleMiddle AgedPrognosisRetrospective StudiesAnticonvulsantsElectroencephalographyNew‐onset refractory status epilepticusRefractory status epilepticusStatus EpilepticusSuper‐refractory status epilepticus

Identifiers

PMID42446501
PMCPMC13675771

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