Tiotropium Slows Worsening (Progression) in Those with Early COPD
Background: Tiotropium (brand name: Spiriva) is a once daily long-acting inhaled bronchodilator that has been approved for treatment of COPD for over 10 years. Studies show that it opens the airways to make it easier to breathe, reduces air trapped in the lungs, and improves both quality of life and ability to exercise.
However, no bronchodilator has been shown to slow the expected worsening (progression) in breathing tests over time.
Study: Dr. Zhou and other investigators in China compared the changes in breathing tests of Spiriva HandiHaler and a placebo (inactive medication) over 2 years in those with “early-stage” COPD. The authors proposed that regular use of this bronchodilator would slow the expected decline in lung function as measured by expiratory volume in one second (FEV1).
Spiriva HandiHaler dry powder inhaler
Only patients with “early-stage” COPD were studied with FEV1 of 50% or higher of the predicted value. The study was conducted in 24 centers in mainland China between October 2011 and September 2015. The findings were reported in the September 7, 2017, issue of the New England Journal of Medicine, volume 377; pages 923-936.
Results: 841 patients completed the trial: 388 received tiotropium and 383 received placebo. Average age was 64 years, and 85% were men. Most patients did not complain of any shortness of breath.
The annual decline in FEV1 was significantly less in those treated with tiotropium compared with placebo when breathing tests were performed after inhaling albuterol in the pulmonary function laboratory at 2 years. The difference between treatments was 22 milliliters per year.
Conclusions: The authors concluded that tiotropium slows worsening in those with early-stage COPD as measured by post-bronchodilator FEV1.
My Comments: The current recommendations for prescribing one or two long-acting bronchodilators is to reduce symptoms and to reduce the risk of a flare-up (exacerbation) in those with COPD. However,this study challenges that approach by showing that early treatment slows progression of COPD as measured by breathing tests.
An editorial in the September 7 issue of the New England Journal of Medicine by Drs. Ko and Wong from the Chinese University of Hong Kong suggested it is likely that other long-acting bronchodilators would provide a similar benefit.
In caring for those with COPD in my practice, I have observed that many individuals have stable breathing tests when tested over several years. I believe that this stability is likely due to two factors: 1. regular use of long-acting bronchodilators; and 2. avoiding a COPD flare-up (exacerbation).
Diagram of spirometry to diagnose COPD. FEV1 is the amount of air exhaled in one second.