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- W3049233609 endingPage "2020" @default.
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- W3049233609 abstract "Introduction Obesity can lead to a late-onset nonallergic (LONA) form of asthma for reasons that are not understood. We sought to determine whether this form of asthma is characterised by any unique physiological features. Methods Spirometry, body plethysmography, multiple breath nitrogen washout (MBNW) and methacholine challenge were performed in four subject groups: Lean Control (n=11), Lean Asthma (n=11), Obese Control (n=11) and LONA Obese Asthma (n=10). The MBNW data were fitted with a novel computational model that estimates functional residual capacity (FRC), dead space volume (V D ), the coefficient of variation of regional specific ventilation (C V, V′ E ) and a measure of structural asymmetry at the level of the acinus (s acin ). Results Body mass index and waist circumference values were similar in both obese groups, and significantly greater than in lean asthmatic individuals and controls. Forced vital capacity was significantly lower in the LONA Asthma group compared with the other groups (p<0.001). Both asthma groups exhibited similar hyperresponsiveness to methacholine. FRC was reduced in the Obese LONA Asthma group as measured by MBNW, but not in obese controls, whereas FRC was reduced in both obese groups as measured by plethysmography. V D , C V, V′ E and s acin were not different between groups. Conclusions Chronic lung compression characterises all obese subjects, as reflected by reduced plethysmographic FRC. Obese LONA asthma is characterised by a reduced ability to recruit closed lung units, as seen by reduced MBNW FRC, and an increased tendency for airway closure as seen by a reduced forced vital capacity." @default.
- W3049233609 created "2020-08-21" @default.
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- W3049233609 date "2020-07-01" @default.
- W3049233609 modified "2023-09-27" @default.
- W3049233609 title "Physiological signature of late-onset nonallergic asthma of obesity" @default.
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- W3049233609 doi "https://doi.org/10.1183/23120541.00049-2020" @default.
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