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• W2091651497 abstract "The relation between the progression of chronic obstructive pulmonary disease (COPD) and exacerbations is unclear. Currently, no animal model of acute exacerbation of COPD (AECOPD) exists. The objectives of this study were to evaluate the effects of mechanical forces induced by deep inspirations (DIs) on short-term deterioration of lung structure and function to mimic AECOPD. At 2, 7, or 21 days after treatment with elastase, mice were ventilated with or without DIs (35 cmH 2 O airway pressure for 3 s, 2 times/min) for 1 h. Functional residual capacity (FRC) was measured with body plethysmography, and respiratory compliance, resistance, and hysteresivity were obtained via forced oscillations. From hematoxylin and eosin-stained sections, equivalent airspace diameters (D), alveolar wall thickness (W t ), number of septal ruptures (N sr ), and attachment density (A d ) around airways were determined. FRC, compliance, and hysteresivity statistically significantly increased with time, and both increased due to DIs. Interestingly, DIs also had an effect on FRC, compliance, resistance, and hysteresivity in control mice. The development of emphysema statistically significantly increased D and W t in time, and the DIs caused subtle differences in D. At 21 days, the application of DIs changed the distribution of D, increased W t and N sr , and decreased A d . These results suggest that once a critical remodeling of the parenchyma has been reached, acute mechanical forces lead to irreversible changes in structure and function, mimicking COPD exacerbations. Thus, the acute application of DIs in mice with emphysema may serve as a useful model of AECOPD." @default.
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• W2091651497 date "2012-10-01" @default.
• W2091651497 modified "2023-09-24" @default.
• W2091651497 title "Acute mechanical forces cause deterioration in lung structure and function in elastase-induced emphysema" @default.
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• W2091651497 doi "https://doi.org/10.1152/ajplung.00217.2012" @default.
• W2091651497 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3469589" @default.
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