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Long-term antibiotics reduce COPD exacerbations, raise questions
Date:11/20/2008

duration of exacerbations from onset to resolution of symptoms was 9 days in the erythromycin group and 13 days in the placebo group.

"Our results did not allow us to determine a mechanism for these findings. However based on in-vitro studies we suspect that the mechanism is likely to involve the anti-inflammatory properties of erythromycin," noted Dr. Seemungal.

While their findings are encouraging, Dr. Seemungal points out that they must be put in context with future findings. Furthermore, the threat of growing antibiotic resistance resulting from widespread prophylactic use of erythromycin is not a trivial concern. "In this scenario, substantial, widespread emergence of macrolide bacterial resistance is virtually foreordained, with attendant reduction in the antimicrobial usefulness of this drug class," wrote Ken M. Kunisaki, M.D. and Denise E. Niewoehner, M.D., of the Veterans Affairs Medical Center in Minneapolis, in the accompanying editorial. "Balancing benefit against harm could pose a dilemma for which there might be no clear answers."

Moreover, not all of the study patients were treated with guideline-recommended therapy, such as inhaled corticosteroids or inhaled long-acting bronchodilators, which have been shown to decrease exacerbation frequency. The degree of added benefit of erythromycin over and above standard therapy will require further study.

"Observations that any intervention might decrease the frequency and severity of acute exacerbations in COPD present considerable public health implications," observed John Heffner, M.D., past president of the ATS. "Exacerbations occur about once a year among patients with moderate to severe COPD and account for more than $30 billion dollars in direct and indirect costs annually in the United States alone."

"Many patients with advanced COPD receive highly potent, extended spectrum antibiotics during acute exacerbations," commented Dr. Heffner. "The relative ris
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Contact: Keely Savoie
ksavoie@thoracic.org
212-315-8620
American Thoracic Society
Source:Eurekalert

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