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Long-term inhaled dry powder mannitol improves lung function in CF
Date:12/15/2011

Adding inhaled dry powder mannitol to standard therapy for cystic fibrosis produced sustained improvement in lung function for up to 52 weeks, according to a new study. Along with the treatment's efficacy and good safety profile, the convenience and ease of administration of mannitol treatment may improve adherence with therapy in these patients.

In the double-blind study, which was supported by Pharmaxis Limited, 318 patients were randomized to treatment with 400 mg bid inhaled mannitol or 50 mg bid inhaled mannitol (control group) for 26 weeks, followed by an additional 26 weeks of open-label active treatment. A 50 mg dose was chosen as the control because it was felt it would not be clinically effective, based on an earlier dose escalation study. Mannitol was given on top of a background of typical concomitant therapy such as recombinant human deoxyribonuclease and inhaled antibiotics.

The findings were published online ahead of print publication in the American Thoracic Society's American Journal of Respiratory and Critical Care Medicine.

"Patients in the treatment group showed a 106.5 mL mean improvement in forced expiratory volume in one second (FEV1), an 8.22 percent improvement from baseline, compared with a 52.4 mL improvement (4.47 percent) in the control group," said lead author Moira L. Aitken, MD, professor of pulmonary and critical care medicine at the University of Washington Medical Center. "Forced vital capacity increased 136.3 mL in the treatment group, compared with 65.0 mL in the control group. Treated patients also experienced fewer pulmonary exacerbations than controls."

The difference in absolute FEV1 between the study and control groups approached statistical significance (p=0.059), while the difference in relative change from baseline FEV1 between groups reached significance (p=0.029). Improvements in FEV1 were maintained in the treatment group during the 26-week open-label extension phase of
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Contact: Nathaniel Dunford
ndunford@thoracic.org
212-315-8620
American Thoracic Society
Source:Eurekalert

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