Complementary and alternative asthma treatments and their association with asthma control: a population-based study

BMJ Open 2013;3:e003360 doi:10.1136/bmjopen-2013-003360

• Complementary medicine

1. Wenjia Chen1,2, 
2. J Mark FitzGerald2,3, 
3. Roxanne Rousseau2, 
4. Larry D Lynd1,4, 
5. Wan C Tan3,5,
6. Mohsen Sadatsafavi2,3

+Author Affiliations

1. ¹Faculty of Pharmaceutical Sciences, Collaboration for Outcomes Research and Evaluation, University of British Columbia Vancouver British Columbia Canada
2. ²Division of Respiratory Medicine, Faculty of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
3. ³Institute for Heart and Lung Health, University of British Columbia, Vancouver, British Columbia, Canada
4. ⁴Centre for Health Evaluation and Outcome Sciences, Providence Health, University of British Columbia, Vancouver, British Columbia, Canada
5. ⁵James Hogg Research Centre, University of British Columbia, Vancouver, British Columbia, Canada

1. Correspondence toDr Mohsen Sadatsafavi; Mohsen.Sadatsafavi@ubc.ca

• Received 6 June 2013
• Revised 23 July 2013
• Accepted 24 July 2013
• Published 4 September 2013

Abstract

Objectives Many patients with asthma spend time and resources consuming complementary and alternative medicines (CAMs). This study explores whether CAM utilisation is associated with asthma control and the intake of asthma controller medications.

Design Population-based, prospective cross-sectional study.

Setting General population residing in two census areas in the province of British Columbia, Canada. Recruitment was based on random-digit dialling of both landlines and cell phones.

Participants 486 patients with self-reported physician diagnosis of asthma (mean age 52 years; 67.3% woman).

Primary and secondary outcome measures We assessed CAM use over the previous 12 months, level of asthma control as defined by the Global Initiative for Asthma and the self-reported intake of controller medications. Multivariate logistic regression was performed to study the relationship between any usage of CAMs (outcome), asthma control and controller medication usage, adjusted for potential confounders.

Results A total of 179 (36.8%) of the sample reported CAM usage in the past 12 months. Breathing exercises (17.7%), herbal medicines (10.1%) and vitamins (9.7%) were the most popular CAMs reported. After adjustment, female sex (OR 1.66; 95% CI 1.09 to 2.52) and uncontrolled asthma (vs controlled asthma, OR 2.25, 95% CI 1.30 to 3.89) were associated with a higher likelihood of using any CAMs in the past 12 months. Controller medication use was not associated with CAM usage in general and in the subgroups defined by asthma control.

Conclusions Clinicians and policy makers need to be aware of the high prevalence of CAM use in patients with asthma and its association with lack of asthma control.

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