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The prevalence of severe refractory asthma

Published:October 14, 2014DOI:https://doi.org/10.1016/j.jaci.2014.08.042

      Background

      Severe asthma is characterized by difficulty to achieve disease control despite high-intensity treatment. However, prevalence figures of severe asthma are lacking, whereas longstanding estimates vary between 5% and 10% of all asthmatic patients. Knowing the exact prevalence of severe refractory asthma as opposed to difficult-to-control asthma is important for clinical decision making, drug development, and reimbursement policies by health authorities.

      Objective

      We sought to estimate the prevalence of severe refractory asthma as defined by the Innovative Medicine Initiative consensus.

      Methods

      Adult patients with a prescription for high-intensity treatment (high-dose inhaled corticosteroids and long-acting β2-agonists or medium- to high-dose inhaled corticosteroids combined with oral corticosteroids and long-acting β2-agonists) were extracted from 65 Dutch pharmacy databases, representing 3% of the population (500,500 inhabitants). Questionnaires were sent to 5,002 patients, of which 2,312 were analyzed. The diagnosis of asthma and degree of asthma control were derived from questionnaires to identify patients with difficult-to-control asthma. Inhalation technique was assessed in a random sample of 60 adherent patients (prescription filling, ≥80%). Patients with difficult-to-control asthma, adherence to treatment, and a correct inhalation technique were qualified as having severe refractory asthma. Results were mirrored to the Dutch population.

      Results

      Of asthmatic adults, 3.6% (95% CI, 3.0% to 4.1%) qualified for a diagnosis of severe refractory asthma, representing 10.4 patients per 10,000 inhabitants.

      Conclusion

      The prevalence of severe refractory asthma might be lower than estimated by expert opinion. This implies that currently recognized severe asthma subphenotypes could meet the criteria of rare diseases.

      Key words

      Abbreviations used:

      ACQ (Asthma Control Questionnaire), COPD (Chronic obstructive pulmonary disease), ICS (Inhaled corticosteroid), IMI (Innovative Medicine Initiative), LABA (Long-acting β2-agonist), OCS (Oral corticosteroid)
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