Background Chronic obstructive pulmonary disease (COPD) resultsfrom a progressive decline in lung function, which is thoughtto be the consequence of airway inflammation. We hypothesizedthat antiinflammatory therapy with inhaled corticosteroids wouldslow this decline.
Methods We enrolled 1116 persons with COPD whose forced expiratoryvolume in one second (FEV1) was 30 to 90 percent of the predictedvalue in a 10-center, placebo-controlled, randomized trial ofinhaled triamcinolone acetonide administered at a dose of 600µg twice daily. The primary outcome measure was the rateof decline in FEV1 after the administration of a bronchodilator.The secondary outcome measures included respiratory symptoms,use of health care services, and airway reactivity. In a substudyof 412 participants, we measured bone density in the lumbarspine and femur at base line and one and three years after thebeginning of treatment.
Results The mean duration of follow-up was 40 months. The rateof decline in the FEV1 after bronchodilator use was similarin the 559 participants in the triamcinolone group and the 557participants in the placebo group (mean [±SE], 44.2±2.9vs. 47.0±3.0 ml per year, P=0.50). Members of the triamcinolonegroup had fewer respiratory symptoms during the course of thestudy (21.1 per 100 person-years vs. 28.2 per 100 person-years,P=0.005) and had fewer visits to a physician because of a respiratoryillness (1.2 per 100 person-years vs. 2.1 per 100 person-years,P=0.03). Those taking triamcinolone also had lower airway reactivityin response to methacholine challenge at 9 months and 33 months(P=0.02 for both comparisons). After three years, the bone densityof the lumbar spine (P=0.007) and the femur (P<0.001) wassignificantly lower in the triamcinolone group.
Conclusions Inhaled triamcinolone does not slow the rate ofdecline in lung function in people with COPD, but it improvesairway reactivity and respiratory symptoms and decreases theuse of health care services for respiratory problems. Thesebenefits should be weighed against the potential long-term adverseeffects of triamcinolone on bone mineral density.
Source Information
The writing group (Robert Wise, M.D., John Connett, Ph.D., Gail Weinmann, M.D., Paul Scanlon, M.D., and Melissa Skeans, M.S.) assumes responsibility for the overall content and integrity of the manuscript.
Address reprint requests to Dr. Connett at the Lung Health Study Coordinating Center, 2221 University Ave. SE, Suite 200, Minneapolis, MN 55414, or at john-c{at}biostat.umn.edu.
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