par Mangado, Nicolás González;Peces-Barba, Germán;Cabanillas, Juan José;Renedo, G.;Verbanck, Sylvia;Paiva, Manuel 
Référence The American review of respiratory disease, 148, 3, page (735-743)
Publication Publié, 1993
Référence The American review of respiratory disease, 148, 3, page (735-743)
Publication Publié, 1993
Article révisé par les pairs
| Résumé : | Lung volumes, diffusing capacity (DL(CO)), quasi-static pressure-volume curves (P-V), forced expiration (FE) and He-SF6 single-breath washout (SBW) were performed in Wistar rats with emphysema induced by different doses of pancreatic elastase in saline, instilled intratracheally 6 wk prior to the tests. Emphysema was quantitatively assessed by mean linear intercept (Lm) measurements on 5-μm lung sections. Lung volume, P-V curve, and FE dependence on Lm, as well as the nonsignificant dependence of DL(CO) on Lm, are generally similar to results reported by others. The most interesting observation concerns the SBW: N2 slopes of the alveolar plateau, compared for identical lung volumes, did not change with the degree of emphysema. By contrast, the He-SF6 slope difference did depend significantly on the degree of emphysema. Based on the diffusion front theory, the present work suggests that in rats with elastase-induced emphysema, the phase III slope modifications relate mainly to elastic and not to structural alterations. |
