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- W2015938870 abstract "It has previously been shown that unproductive coughing in both healthy subjects and patients with airways obstruction is not effective in clearing lung secretions. This study investigates the regional mucus transport in a group of subjects with airways obstruction who failed to expectorate following instructed cough and forced expiration technique. Fourteen patients (mean +/- SEM age: 68 +/- 2 years) with airways obstruction (mean +/- SEM percent predicted. FEV1: 54 +/- 5; daily wet weight sputum: 9.1 +/- 2.0 g) took part in the study which was a randomized, three-way crossover within-patient design. Each patient underwent three treatment maneuvers: control, cough (30 coughs over a 10-min period), and forced expiration (30 forced expirations over a 10-min period). An objective radioaerosol technique was used to monitor regional mucus movement within the lungs of the patients. The lungs were divided arbitrarily into four regions of interest: tracheal, inner, intermediate, and outer. Peak expiratory flow rate during cough and forced expiration was measured at the mouth. There was no correlation between the radioaerosol clearance from all regions and (1) mean peak flow during cough and forced expiration, and (2) mean 24-h sputum production prior to the study day. There were no differences in regional radioaerosol clearance between cough and forced expiration. However, both cough and forced expiration resulted in significant clearance compared with control for all regions with the exception of the forced expiration in the outer region. To our knowledge, this study is the first to demonstrate that unproductive cough and forced expiration result in movement of secretions proximally from all regions of the lung in patients with airways obstruction." @default.
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- W2015938870 date "1994-05-01" @default.
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- W2015938870 title "Regional Mucus Transport Following Unproductive Cough and Forced Expiration Technique in Patients With Airways Obstruction" @default.
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- W2015938870 doi "https://doi.org/10.1378/chest.105.5.1420" @default.
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