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Dipartimenti di Scienze Motorie e Riabilitative e di Medicina Interna, Università di Genova, 16132 Genova; and Fisiopatologia Respiratoria, Azienda Ospedaliera S. Croce e Carle, 12100 Cuneo, Italy
Reticular basement membrane (RBM) thickness and
airway responses to inhaled methacholine (MCh) were studied in
perennial allergic asthma (n = 11), perennial allergic
rhinitis (n = 8), seasonal allergic rhinitis
(n = 5), and chronic obstructive pulmonary disease (COPD, n = 9). RBM was significantly thicker in
asthma (10.1 ± 3.7 µm) and perennial rhinitis (11.2 ± 4.2 µm) than in seasonal rhinitis (4.7 ± 0.7 µm) and COPD
(5.2 ± 0.7 µm). The dose (geometric mean) of MCh causing a 20%
decrease of 1-s forced expiratory volume (FEV1) was
significantly higher in perennial rhinitis (1,073 µg) than in asthma
(106 µg). In COPD, the slope of the linear regression of all values
of forced vital capacity plotted against FEV1 during the
challenge was higher, and the intercept less, than in other groups,
suggesting enhanced airway closure. In asthma, RBM thickness was
positively correlated (r = 0.77) with the dose
(geometric mean) of MCh causing a 20% decrease of FEV1 and
negatively correlated (r =
0.73) with the forced
vital capacity vs. FEV1 slope. We conclude that
1) RBM thickening is not unique to bronchial asthma, and
2) when present, it may protect against airway narrowing and air trapping. These findings support the opinion that RBM thickening represents an additional load on airway smooth muscle.
airway responsiveness; remodeling; asthma; chronic obstructive pulmonary disease; rhinitis
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