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'Difficult-to-treat asthma' may be due to difficult-to-treat patients
Date:10/22/2009

Difficult-to-treat asthma often may have more to do with patients who do not take their medication as instructed than ineffective medication, according to researchers in Northern Ireland.

"[A] significant proportion of patients with difficult asthma are poorly adherent to inhaled and oral corticosteroid therapy," wrote principal investigator, Dr. Liam Heaney, of Belfast City Hospital.

The results of the study were published in the November 1 issue of the American Journal of Respiratory and Critical Care Medicine, an official publication of the American Thoracic Society.

"Defining the scale and identifying non-adherence in this population is important given currently available and other imminent expensive biological therapies," said Dr. Heaney.

Dr. Heaney and colleagues obtained data from almost 200 patients who were referred to a tertiary referral clinic that specializes in treating difficult asthma. To assess compliance with inhaled corticosteroid therapy (ICT), they compared patient prescription to the patient's actual refill usage. They used blood plasma prednisolone and cortisol levels to evaluate oral medication adherence.

Of the 182 consecutive patients, 35 percent filled fewer than half of their prescribed inhaled combination therapy (ICT), 21 percent filled more than they were prescribed and 45 percent filled between half and all of the medication they were prescribed.

Furthermore, in patients who were on a maintenance course of oral prednisolone, blood levels of cortisol and prednisolone showed that nearly half (45 percent) were not taking the medication as prescribed. In follow-up conversations with the researchers, most admitted that they were inconsistent in the use of their medications. Of the 23 patients who were non-adherent to their oral prednisolone, 15or 65 percentwere also non-adherent to their ICT.

"All subjects had initially denied poor medication adherence, and poor
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Contact: Keely Savoie
ksavoie@thoracic.org
212-305-8620
American Thoracic Society
Source:Eurekalert

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