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Multi-symptom asthma as an indication of disease severity in epidemiology

  • Linda Ekerljung
  • Apostolos Bossios
  • Jan Lötvall
  • Anna-Carin Olin
  • Eva Rönmark
  • Göran Wennergren
  • Kjell Torén
  • Bo Lundbäck
Open Access
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Keywords

Asthma Rhinitis Allergic Rhinitis Emergency Department Visit Asthma Exacerbation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Epidemiological questionnaires have failed to identify individuals with severe asthma. The extent of symptoms of asthma can, however, easily be established in epidemiological studies by identification of multiple symptoms. We hypothesized that reporting of multiple symptoms of asthma reflects uncontrolled disease and can be a sign of more severe asthma. The aims of the current study were, therefore, to determine the prevalence and determinants of multi-symptom asthma. In this paper we report our definition of multi-symptom asthma and its clinical characteristics. A postal questionnaire was mailed to 30,000 randomly selected subjects aged 16 75 yrs. A subgroup underwent detailed clinical examinations including lung function test, exhaled NO, methacholine test in addition to a detailed clinical history by using structured interview. Multi-symptom asthma was defined as questionnaire reported physician-diagnosed asthma, use of asthma medication, recurrent wheeze, attacks of shortness of breath, and at least one additional respiratory symptom. The overall prevalence of physician-diagnosed asthma was 8.3%, while of multi-symptom asthma the prevalence was 2.0% (women 2.4%, men 1.5%, p < 0.001). Multi-symptom asthma versus other asthma was associated with lower FEV1 (88.8% pred vs. 98.8% pred), higher FeNO (29.3 ppb vs. 23.2 ppb), a greater proportion having PD20 < 1.96 mg methacholine chloride (82.9% vs. 58.7%), all statistically highly significant. The same pattern was found for asthma exacerbations, emergency department visits and hospitalizations. All respiratory symptoms were more common in multi-symptom asthma compared with other asthma, and that was true also for symptoms of bronchitis, rhinitis and rhino-sinusitis. In contrast, allergic rhinitis and allergic sensitization were not more common in multi-symptoms asthma than in other asthma. Multi-symptom asthma cannot be used for defining severe asthma. We conclude, however, that multi-symptom asthma, as we defined the condition, is related to signs of more severe disease and could be used as an epidemiological marker of asthma severity.

Copyright information

© Ekerljung et al; licensee BioMed Central Ltd. 2013

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Linda Ekerljung
    • 1
  • Apostolos Bossios
    • 2
  • Jan Lötvall
    • 2
  • Anna-Carin Olin
    • 3
  • Eva Rönmark
    • 4
  • Göran Wennergren
    • 5
  • Kjell Torén
    • 3
  • Bo Lundbäck
    • 2
  1. 1.University of GothenburgSweden
  2. 2.University of GothenburgInstitute of Medicine/Krefting Research CentreSweden
  3. 3.University of GothenburgInstitute of Medicine/Dept of Occup & Envir MedSweden
  4. 4.University of UmeåDept of Public Health & Clinical MedicineSweden
  5. 5.University of GothenburgDept of PediatricsSweden

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