Evidence map›Paper›PMID 34195253›Full record

ArticleERJ open research2021

Characteristics and impact of exercise-induced laryngeal obstruction: an international perspective.

Emil S Walsted, Bamidele Famokunwa, Louise Andersen, Sune L Rubak, Frederik Buchvald, Lars Pedersen, James Dodd, Vibeke Backer, Kim G Nielsen, Andrew Getzin and 1 more

Open access · goldAbstract read
In one paragraph

Article in ERJ open research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
5.7field-weighted citation impact, top 3% 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

23 citing papers in PubMed, 49 citations in OpenAlex.

  1. Microevolutionary divergence and plasticity of laryngeal shape in the house mouse (American journal of physiology. Regulatory, integrative and comparative physiology · 2025
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  5. Clinical Case Study: Pediatric Exercise-Induced Laryngeal Obstruction.Perspectives of the ASHA special interest groups · 2025
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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

11 authors at 8 institutions in 3 countries.

Emil S WalstedDept of Respiratory Medicine, Bispebjerg Hospital, Copenhagen, Denmark.ORCID https://orcid.org/0000-0002-6640-7175
Bamidele FamokunwaAcademic Respiratory Unit, University of Bristol, Southmead Hospital, Bristol, UK.
Louise AndersenDept of Pediatrics and Adolescent Medicine, Aarhus University Hospital Skejby, Aarhus, Denmark.
Sune L RubakDept of Pediatrics and Adolescent Medicine, Aarhus University Hospital Skejby, Aarhus, Denmark.
Frederik BuchvaldPediatric Pulmonary Service, Dept of Pediatrics and Adolescent Medicine, Rigshospitalet, Denmark.
Lars PedersenDept of Respiratory Medicine, Bispebjerg Hospital, Copenhagen, Denmark.ORCID https://orcid.org/0000-0002-5950-652X
James DoddAcademic Respiratory Unit, University of Bristol, Southmead Hospital, Bristol, UK.ORCID https://orcid.org/0000-0003-4805-5759
Vibeke BackerDept of ENT and Centre for Physical Activity Research, Rigshospitalet and Copenhagen University, Copenhagen, Denmark.
Kim G NielsenPediatric Pulmonary Service, Dept of Pediatrics and Adolescent Medicine, Rigshospitalet, Denmark.
Andrew GetzinCayuga Medical Center, Ithaca, NY, USA.
James H HullDept of Respiratory Medicine, Royal Brompton Hospital, London, UK.ORCID https://orcid.org/0000-0003-4697-1526
Aarhus University Hospital · DKBispebjerg Hospital · DKSouthmead Hospital · GBCopenhagen University Hospital · DKIthaca College · USRigshospitalet · DKRoyal Brompton Hospital · GBUniversity of Copenhagen · DK

Funding

Medical Research Council MR/T005114/1
6 · The paper itself

Abstract

backgroundExercise-induced laryngeal obstruction (EILO) is a common cause of exertional breathlessness and wheeze yet is frequently misdiagnosed as asthma. Insight regarding the demographic characteristics, laryngeal abnormalities and impact of EILO is currently limited, with data only available from individual centre reports. The aim of this work was to provide a broader perspective from a collaboration between multiple international expert centres.

methodsFive geographically distinct clinical paediatric and adult centres (3 Denmark, 1 UK, 1 USA) with an expertise in assessing unexplained exertional breathlessness completed database entry of key characteristic features for all cases referred with suspected EILO over a 5-year period. All included cases completed clinical asthma workup and continuous laryngoscopy during exercise (CLE) testing for EILO.

resultsData were available for 1007 individuals (n=713 female (71%)) with a median (range) age of 24 (8-76) years, and of these 586 (58%) were diagnosed with EILO. In all centres, EILO was frequently misdiagnosed as asthma; on average there was a 2-year delay to diagnosis of EILO, and current asthma medication was discontinued in 20%. Collapse at the supraglottic level was seen in 60%, whereas vocal cord dysfunction (VCD) was only detected/visualised in 18%. Nearly half (45%) of individuals with EILO were active participants in recreational-level sports, suggesting that EILO is not simply confined to competitive/elite athletes.

conclusionOur findings indicate that key clinical characteristics and the impact of EILO/VCD are similar in globally distinct regions, facilitating improved awareness of this condition to enhance recognition and avoid erroneous asthma treatment.

Identifiers

PMID34195253
PMCPMC8236618
OpenAlexW3163857574

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.