Evidence map›Paper›PMID 25277888›Full record

SynthesisNeurocritical care2015

Continuous EEG monitoring in aneurysmal subarachnoid hemorrhage: a systematic review.

Daniel Kondziella, Christian K Friberg, Ian Wellwood, Clemens Reiffurth, Martin Fabricius, Jens P Dreier

Open access · bronzeAbstract readSystematic Review
PubMed Publisher
In one paragraph

Synthesis in Neurocritical care, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 25 papers.

0numbers the graph read from it
0cells of the map it votes in
25citing papers in PubMed
3.0field-weighted citation impact, top 10% of its field
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

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

25 citing papers in PubMed, 71 citations in OpenAlex.

  1. Review
  2. Article
  3. Review
  4. Article
  5. The effect of antiseizure medication on mortality in spontaneous aneurysmal subarachnoid hemorrhage.Journal of critical care medicine (Universitatea de Medicina si Farmacie din Targu-Mures) · 2025
    Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Review
  11. Review
  12. Article
  13. Article
  14. Review
  15. Article
  16. The role of spreading depolarizations and electrographic seizures in early injury progression of the rat photothrombosis stroke model.Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2021
    Article
  17. Article
  18. Vasospasm following aneurysmal subarachnoid hemorrhage: prediction, detection, and intervention.The Egyptian journal of neurology, psychiatry and neurosurgery · 2019
    Article
  19. Article
  20. Epileptiform abnormalities predict delayed cerebral ischemia in subarachnoid hemorrhage.Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology · 2017
    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

6 authors at 2 institutions in 3 countries.

Daniel KondziellaDepartment of Neurology, Rigshospitalet, Copenhagen University Hospital, 2100, Copenhagen, Denmark, daniel_kondziella@yahoo.com.
Christian K Friberg
Ian Wellwood
Clemens Reiffurth
Martin Fabricius
Jens P Dreier
Charité - Universitätsmedizin Berlin · DECopenhagen University Hospital · DK

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundContinuous EEG (cEEG) may allow monitoring of patients with aneurysmal subarachnoid hemorrhage (SAH) for delayed cerebral ischemia (DCI) and seizures, including non-convulsive seizures (NCSz), and non-convulsive status epilepticus (NCSE). We aimed to evaluate: (a) the diagnostic accuracy of cEEG as a confirmatory test, (b) the prognostic value of EEG patterns suggestive of seizures and DCI, and (c) the effectiveness of intensified neuromonitoring using cEEG in terms of improved clinical outcome following SAH.

methodsA systematic review was performed with eligible studies selected from multiple indexing databases through June 2014. The methodological quality of these studies was assessed using the Quality Assessment of Diagnostic Accuracy Studies-2.

resultsEighteen studies were identified, including cEEG data from 481 patients with aneurysmal SAH. NCSz were diagnosed in 7-18 % of patients; NCSE in 3-13 %. NCSE was associated with increased age (mean age 68 years) and mortality (82-100 %) compared to the entire patient population (53.9 years; mortality 13 %; p values <0.05). DCI was diagnosed in 20-46 % of patients. Quantitative EEG patterns suggestive of DCI included decreased alpha/delta ratio, relative alpha variability, and total power. All studies were subject to a high risk of bias concerning patient selection and cEEG methodology.

conclusionscEEG monitoring following SAH detects an increased number of subclinical seizures and may predict DCI many hours in advance. NCSE is associated with high mortality and morbidity, whereas for DCI identified by cEEG this association is less clear. Prospective randomized controlled multicenter trials are needed to evaluate the benefits (or risks) of intensified treatment of seizures and DCI following SAH.

Indexed as

ElectroencephalographyNeurophysiological MonitoringBrain IschemiaHumansSeizuresSubarachnoid Hemorrhage

Identifiers

PMID25277888
OpenAlexW2041172824

What OpenQuestion holds

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Read underepoch 390

Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.