Journal
NEW ENGLAND JOURNAL OF MEDICINE
Volume 362, Issue 11, Pages 975-985Publisher
MASSACHUSETTS MEDICAL SOC
DOI: 10.1056/NEJMoa1001278
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Funding
- National Heart, Lung, and Blood Institute [HL064307, HL064288, HL064295, HL064287, HL064305, HL064313]
- National Institute of Allergy and Infectious Diseases [T32AI007635]
- National Center for Research Resources [UL1-RR025011, UL1-RR025780, UL1-RR024992]
- General Clinical Research Centers at Washington University School of Medicine [M01-RR00036]
- National Jewish Health [M01-RR00051]
- University of Wisconsin [M01-RR03186]
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Background: For children who have uncontrolled asthma despite the use of low-dose inhaled corticosteroids (ICS), evidence to guide step-up therapy is lacking. Methods: We randomly assigned 182 children (6 to 17 years of age), who had uncontrolled asthma while receiving 100 microg of fluticasone twice daily, to receive each of three blinded step-up therapies in random order for 16 weeks: 250 microg of fluticasone twice daily (ICS step-up), 100 microg of fluticasone plus 50 microg of a long-acting beta-agonist twice daily (LABA step-up), or 100 microg of fluticasone twice daily plus 5 or 10 mg of a leukotriene-receptor antagonist daily (LTRA step-up). We used a triple-crossover design and a composite of three outcomes (exacerbations, asthma-control days, and the forced expiratory volume in 1 second) to determine whether the frequency of a differential response to the step-up regimens was more than 25%. Results: A differential response occurred in 161 of 165 patients who were evaluated (P<0.001). The response to LABA step-up therapy was most likely to be the best response, as compared with responses to LTRA step-up (relative probability, 1.6; 95% confidence interval [CI], 1.1 to 2.3; P=0.004) and ICS step-up (relative probability, 1.7; 95% CI, 1.2 to 2.4; P=0.002). Higher scores on the Asthma Control Test before randomization (indicating better control at baseline) predicted a better response to LABA step-up (P=0.009). White race predicted a better response to LABA step-up, whereas black patients were least likely to have a best response to LTRA step-up (P=0.005). Conclusions: Nearly all the children had a differential response to each step-up therapy. LABA step-up was significantly more likely to provide the best response than either ICS or LTRA step-up. However, many children had a best response to ICS or LTRA step-up therapy, highlighting the need to regularly monitor and appropriately adjust each child's asthma therapy. (ClinicalTrials.gov number, NCT00395304.) N Engl J Med 2010;362:975-85.
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