Evidence map›Paper›PMID 33172719›Full record

SynthesisClinical neurology and neurosurgery2021

Exacerbation of neurological symptoms and COVID-19 severity in patients with preexisting neurological disorders and COVID-19: A systematic review.

Takafumi Kubota, Naoto Kuroda

Open access · greenAbstract readSystematic Review
In one paragraph

Synthesis in Clinical neurology and neurosurgery, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 61 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
61citing papers in PubMed, 4 pooled it
6.6field-weighted citation impact, top 2% 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

61 citing papers in PubMed, 4 syntheses or guidelines pooled it, 99 citations in OpenAlex.

  1. Definitions and symptoms of the post-COVID syndrome: an updated systematic umbrella review.European archives of psychiatry and clinical neuroscience · 2025
    Pooled it
  2. Pooled it
  3. Pooled it
  4. COVID-19, de novo seizures, and epilepsy: a systematic review.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2021
    Pooled it
  5. Article
  6. Combination antiviral and anti-inflammatory therapy mitigates persistent neurological deficits in mice post SARS-CoV-2 infection.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  7. Article
  8. Article
  9. Article
  10. Case Study 8: A 70-Year-Old Man With Memory Loss, Wandering, and Inappropriate Behaviors.The Journal of neuropsychiatry and clinical neurosciences · 2025
    Article
  11. Review
  12. Observational
  13. Review
  14. Article
  15. Article
  16. Article
  17. Review
  18. Article
  19. Article
  20. Article

1 more citing papers are in PubMed but not listed here.

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

2 authors at 2 institutions in 2 countries.

Takafumi KubotaDepartment of Neurology, University Hospitals of Cleveland Medical Center, Cleveland, USA; Department of Neurology, Case Western Reserve University, Cleveland, USA. Electronic address: takafumi.kubota.0612@gmail.com.
Naoto KurodaDepartment of Pediatrics, Wayne State University, Detroit, USA; Department of Epileptology, Tohoku University Graduate School of Medicine, Sendai, Japan.
University Hospitals of Cleveland · USWayne State University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundPatients with chronic diseases likely develop severe 2019 coronavirus disease (COVID-19). However, little is known about the effects of COVID-19 on patients with neurological disorders. We conducted a systematic review to evaluate the severity of COVID-19 and its effect on neurological symptoms in patients with preexisting neurological disorder and COVID-19.

methodsWe searched the MEDLINE (PubMed) and medRxiv databases for reports of patients with both preexisting neurological disorders and COVID-19. Studies reporting data on changes in the symptoms of preexisting neurological disorders and/or the severity of COVID-19 were included.

resultsTwenty-six articles with 2278 patients with preexisting neurological disorder and COVID-19 were identified. Of 232 patients, 74 (31.9 %) showed exacerbation of preexisting neurological symptoms of dementia (55/92; 59.5 %), Parkinson's disease (10/17; 58.8 %), epilepsy (1/1; 100 %), and unspecified neurological disorders (8/106; 7.5 %). Of 2168 patients, 478 (22.0 %) showed severe COVID-19 course. These included patients with cerebrovascular disease (86/445; 19.3 %), dementia (70/316; 22.2 %), Parkinson's disease (25/214; 11.7 %), multiple sclerosis (28/71; 39.4 %), spinal cord injury (5/7; 71.4 %), epilepsy (10/98; 10.2 %) and unspecified neurological disorders (254/1011; 25 %).

conclusionsPatients with preexisting neurological disorders and COVID-19 may develop exacerbation of neurological symptoms and severe COVID-19. Clinicians should be aware of the risk of symptom exacerbation and severe COVID-19 in patients with preexisting neurological disease and should focus on the prevention and early care of COVID-19.

Indexed as

Disease ProgressionComorbidityCOVID-19HumansNervous System DiseasesNeurologic ExaminationPreexisting Condition CoverageCOVID-19EpilepsyNeurological disorderNeurologyReviewSystematic

Identifiers

PMID33172719
PMCPMC7604080
OpenAlexW3095977293

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.