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Study: Half of COPD Patients Misdiagnosed as Having Asthma

June 1, 2006 by HME Business

DENVER &#151 A new study shows that more than half of patients with chronic obstructive pulmonary disease (COPD) may be misdiagnosed as having asthma. The study results, published in the Journal of Asthma, are from the most recent patient-reported COPD study to examine COPD misdiagnosis.

COPD, which includes chronic bronchitis and emphysema, is characterized by a loss of lung function over time. COPD affects nearly 12 million Americans. Unlike asthma, COPD is associated with a cascade of decline that leads to a diminished quality of life over time.

“Millions of people live with COPD for years, so their inability to do the things they enjoy because they simply can’t breathe is devastating,” said the study’s lead author David G. Tinkelman, M.D., vice president for Health Initiatives, National Jewish Medical and Research Center, Denver. “We need to clarify the differences between COPD and asthma so patients get the right diagnosis early and the appropriate interventions needed to change the course of this growing health crisis.”

The study, conducted in Denver and Aberdeen, Scotland, and sponsored by Boehringer Ingelheim Pharmaceuticals Inc. and Pfizer Inc., analyzed data from 597 patients age 40 and older with a history of lung disease or recent treatment with respiratory medications. Patients were then screened using spirometry, a lung function test, to confirm their diagnosis of COPD. In this study, a COPD diagnosis was defined in agreement with American Thoracic Society and European Respiratory Society guidelines as the presence of obstruction &#151 inability to get air out of the lungs &#151 based on spirometry results.

Of the 235 patients diagnosed with COPD by spirometry, 51.5 percent reported a prior diagnosis of asthma only. Only 37.9 percent of participants diagnosed with COPD based on the study tests reported a previous diagnosis of the disease, while 10.6 percent reported no prior diagnosis of COPD or asthma.

“These findings are surprising given the availability of credible diagnosis and treatment guidelines specifically for COPD,” noted Dr. Tinkelman. “Only through proper diagnosis and treatment will COPD patients fully benefit. Patients can benefit from lifestyle modification, pulmonary rehabilitation and proper pharmacotherapy that may help them breathe better and return to the activities they enjoy.”

Source: National Jewish Medical and Research Center

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