Evidence map›Paper›PMID 32802826›Full record

ReviewERJ open research2020

The burden of exacerbations in mild asthma: a systematic review.

J Mark FitzGerald, Peter J Barnes, Bradley E Chipps, Christine R Jenkins, Paul M O'Byrne, Ian D Pavord, Helen K Reddel

Open access · goldAbstract readReview
In one paragraph

Review in ERJ open research, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 39 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
39citing papers in PubMed, 1 pooled it
4.3field-weighted citation impact, top 5% 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

39 citing papers in PubMed, 1 synthesis or guideline pooled it, 64 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Review
  4. Asthma Burden in Mild Adult Asthma in the PEARL Survey: Asthma Control and Health Status.The journal of allergy and clinical immunology. In practice · 2026
    Article
  5. Review
  6. Article
  7. Review
  8. Review
  9. Article
  10. Article
  11. Identifying and Addressing the Hidden Risks of Mild Asthma.Federal practitioner : for the health care professionals of the VA, DoD, and PHS · 2025
    Article
  12. High-flow nasal cannula in severe asthma exacerbations: current evidence and clinical perspectives.European respiratory review : an official journal of the European Respiratory Society · 2025
    Review
  13. Article
  14. Article
  15. Article
  16. Observational
  17. Article
  18. Review
  19. Risk Factors for Acute Asthma Exacerbations in Adults With Mild Asthma.The journal of allergy and clinical immunology. In practice · 2024
    Article
  20. Novel Machine Learning Identifies 5 Asthma Phenotypes Using Cluster Analysis of Real-World Data.The journal of allergy and clinical immunology. In practice · 2024
    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 at 7 institutions in 4 countries.

J Mark FitzGeraldInstitute for Heart and Lung Health, University of British Columbia, Vancouver, BC, Canada.ORCID https://orcid.org/0000-0002-8753-6056
Peter J BarnesAirway Disease Section, National Heart and Lung Institute, Imperial College, London, UK.ORCID https://orcid.org/0000-0002-5122-4018
Bradley E ChippsCapital Allergy and Respiratory Disease Center, Sacramento, CA, USA.
Christine R JenkinsThe George Institute for Global Health and Faculty of Medicine, UNSW, Sydney, Australia.ORCID https://orcid.org/0000-0003-2717-5647
Paul M O'ByrneFirestone Institute of Respiratory Health, St Joseph's Healthcare and Dept of Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada.ORCID https://orcid.org/0000-0003-0979-281X
Ian D PavordOxford Respiratory NIHR BRC, Nuffield Dept of Medicine, University of Oxford, Oxford, UK.ORCID https://orcid.org/0000-0002-4288-5973
Helen K ReddelWoolcock Institute of Medical Research, University of Sydney, Sydney, Australia.ORCID https://orcid.org/0000-0002-6695-6350
Capital Allergy and Respiratory Disease Center · USImperial College London · GBSt. Joseph’s Healthcare Hamilton · CAThe University of Sydney · AUUniversity of British Columbia · CAUniversity of Oxford · GBUNSW Sydney · AU

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundAlthough most patients with asthma have mild disease, data on how mild asthma is defined, and how frequently exacerbations occur in this patient population are scarce, so we aimed to redress this.

methodsWe searched Medline and Medline In-Process (PubMed), and Embase in OVID for English-language publications containing "mild asthma" plus at least one relevant therapy and outcome/keyword, limited to randomised controlled trials (RCTs) and observational studies published between January 1990 and February 2019. Publications were filtered to ensure appropriate data extraction. The main outcomes were the definitions of mild asthma and exacerbations, baseline exacerbation rates and exacerbation data for placebo recipients in prospective studies. Meta-analysis of exacerbation rates was planned.

findingsOf 4064 articles identified, 64 were included in our review (49 743 subjects); 54 RCTs and 10 observational/other studies. Six main types of definitions of mild asthma were identified. While care was taken to ensure inclusion only of patients with mild asthma, marked heterogeneity was revealed in the definitions of mild asthma and hence the study populations. Reporting of exacerbations also varied widely between studies, precluding meta-analysis. Between 0-22% of patients were hospitalised for asthma or had a severe exacerbation in the previous year, according to baseline data from prospective studies. In RCTs, severe exacerbation rates in placebo recipients taking only short-acting β

conclusionsThese data provide new evidence of the burden of exacerbations in mild asthma and highlight the need for standardised definitions of mild asthma and of exacerbations to progress further research.

Identifiers

PMID32802826
PMCPMC7418821
OpenAlexW3048786325

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
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.