Asthma Step Up Therapy in Children
A 7 year old boy with asthma remains symptomatic despite adherence and correct spacer technique on a high dose inhaled corticosteroid. He wheezes on 4 days a week and wakes at night twice a week. Skin prick tests to house dust mite and cat are negative, and serum IgE is 32 IU/mL. Spirometry shows FEV1 72 percent of predicted with 14 percent reversibility. Which is the most appropriate next addition?
- A.Inhaled long acting beta 2 agonistCorrect
- B.Daily oral corticosteroid
- C.Inhaled sodium cromoglicate
- D.Subcutaneous anti IgE monoclonal antibody
Explanation
When a school aged child remains uncontrolled despite a medium to high dose inhaled corticosteroid with verified adherence and technique, the preferred next step is to add a long acting beta 2 agonist as a combination inhaler rather than to escalate the corticosteroid dose further. Combination therapy improves symptom control, lung function and exacerbation rates while limiting the dose related systemic effects of inhaled corticosteroid, and the fixed combination device guarantees that the long acting bronchodilator is never taken without an anti inflammatory. Long acting beta 2 agonists produce sustained smooth muscle relaxation for about 12 hours through beta 2 receptor stimulation, and formoterol additionally has a rapid onset that permits maintenance and reliever therapy regimens. A daily oral corticosteroid would suppress growth and the adrenal axis and is a last resort for severe refractory asthma, not a routine step up. Sodium cromoglicate is a weak, largely obsolete mast cell stabiliser with no role at this severity. Omalizumab is reserved for children aged 6 years and older with severe allergic asthma proven by a positive skin or specific IgE test to a perennial aeroallergen and a total IgE within the dosing range, and this boy has negative allergy testing with a low total IgE, so he does not qualify. A leukotriene receptor antagonist is a reasonable but less effective alternative add on. Before any step up, comorbidities such as rhinitis, obesity, reflux and ongoing tobacco smoke exposure must be excluded.
Why each option
- A.
- Correct. Adding a long acting beta 2 agonist to an inhaled corticosteroid is the preferred step up for uncontrolled asthma in children aged 6 years and older.
- B.
- Maintenance oral steroids cause growth suppression, adrenal suppression and bone loss, and are reserved for severe refractory asthma after biologics have been considered.
- C.
- Sodium cromoglicate is far too weak for a child failing high dose inhaled corticosteroid and is no longer recommended.
- D.
- Omalizumab requires demonstrated allergic sensitisation and an elevated total IgE in the dosing range; this child has negative skin tests and low IgE, so he is not a candidate.
Reference: GINA Global Strategy for Asthma Management and Prevention, 2024
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