Are we too ready to diagnose asthma in children?

Recurrent respiratory symptoms in children are extremely common. A proportion of those children who experience recurrent respiratory symptoms have asthma—reversible airways obstruction associated with bronchial hyperreactivity, allergic inflammation of the airways, and a response to treatment with bronchodilators and regular prophylactic inhaled anti-inflammatory agents. Since we cannot easily measure bronchial hyperresponsiveness or inflammation and clinical correlates are not specific, diagnosis often depends on response to treatment. But how big is the proportion with asthma, how does that proportion vary with age, and are we successful in applying the asthma label and giving the asthma treatments to the right group of children? The prevalence of asthma has undoubtedly increased in industrialised countries over the last few decades. Increases in rates of physician diagnosis of asthma are partially accounted for by changes in diagnostic preference, but there is consistent survey evidence for the increasing prevalence of symptomatic wheezing. Parent reported prevalence of attacks of wheezing in Oslo children aged 6–16 increased from 3.7% to 6.8% between 1981 and 1994.1 Exercise induced bronchospasm is closely related to asthma, and the proportion of 12 year old children in Wales whose peak flow dropped by more than 25% after running doubled between 1973 and 1988.2 It was equally clear in the 1980s that childhood asthma was underdiagnosed and undertreated. Eleven out of 31 Tyneside schoolchildren experiencing more than 12 episodes of wheezing per year and three out of 56 with 4–12 episodes per year had been offered a diagnosis of asthma by their general practitioner.3 Since then, growing awareness of the existence of childhood asthma and of the effectiveness and relative safety of regular inhaled prophylactic agents has led to considerably higher rates of diagnosis and treatment. Has the pendulum swung too far the other way? Are we now making false diagnoses …

[1]  A. Majeed,et al.  Prescribing for patients with asthma by general practitioners in England and Wales 1994-96 , 1999 .

[2]  P. Lambert,et al.  Recurrent cough: Natural history and significance in infancy and early childhood , 1998, Pediatric pulmonology.

[3]  J. Carlin,et al.  A randomised, placebo controlled trial of inhaled salbutamol and beclomethasone for recurrent cough , 1998, Archives of disease in childhood.

[4]  D. Cochran Diagnosing and treating chesty infants , 1998, BMJ.

[5]  D. Strachan,et al.  Prevalence of asthma symptoms, diagnosis, and treatment in 12–14 year old children across Great Britain (international study of asthma and allergies in childhood, ISAAC UK) , 1998, BMJ.

[6]  M. Silverman,et al.  Wheezing phenotypes in childhood. , 1997, Thorax.

[7]  S. Holgate,et al.  Effect of inhaled corticosteroids on episodes of wheezing associated with viral infection in school age children: randomised double blind placebo controlled trial , 1997, BMJ.

[8]  A. Gulsvik,et al.  Changing prevalence of asthma in school children: evidence for diagnostic changes in asthma in two surveys 13 yrs apart. , 1997, The European respiratory journal.

[9]  P. Sly,et al.  Allergic respiratory disease: strategic targets for primary prevention during childhood. , 1997, Thorax.

[10]  M. Silverman,et al.  Effect of continuous treatment with topical corticosteroid on episodic viral wheeze in preschool children. , 1995, Archives of disease in childhood.

[11]  W. Morgan,et al.  Asthma and wheezing in the first six years of life. The Group Health Medical Associates. , 1995, The New England journal of medicine.

[12]  S. Mckenzie,et al.  Cough--but is it asthma? , 1994, Archives of disease in childhood.

[13]  R G Neville,et al.  Diagnosis and treatment of asthma in children: usefulness of a review of medical records. , 1992, The British journal of general practice : the journal of the Royal College of General Practitioners.

[14]  H. Bisgaard,et al.  Inhaled budesonide for treatment of recurrent wheezing in early childhood , 1990, The Lancet.

[15]  B. Butland,et al.  Changes in asthma prevalence: two surveys 15 years apart. , 1989, Archives of disease in childhood.

[16]  S. Stewart-Brown,et al.  Preschool wheezing and prognosis at 10. , 1986, Archives of disease in childhood.

[17]  E. Hey,et al.  Underdiagnosis and undertreatment of asthma in childhood. , 1983, British medical journal.