Journal of Applied Physiology
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J Appl Physiol 88: 821-826, 2000;
8750-7587/00 $5.00
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Vol. 88, Issue 3, 821-826, March 2000

Lung function and ventilation inhomogeneity in rat lungs after allergen challenge

M. Victoria Sánchez-Cifuentes1, Maria L. Rubio1, Mercedes Ortega1, German Peces-Barba1, Manuel Paiva2, Sylvia Verbanck3, and Nicolás González Mangado1

1 Laboratorio de Fisiopatología Respiratoria Experimental, Servicio de Neumología, Fundación Jiménez Díaz, Universidad Autómona, 28040 Madrid, Spain; 2 Biomedical Physics Laboratory, Université Libre de Bruxelles, 1070 Brussels; and 3 Akademisch Ziekenhuis, Vrije Universiteit Brussel, 1090 Brussels, Belgium

We studied the early response to ovalbumin challenge in sensitized Brown-Norway rats through its effect on N2, He, and SF6 phase III slopes of the single-breath washout and on indexes of lung function. Sensitized rats showed varying degrees of response in terms of pulmonary pressure (PL), with increases ranging between 125 and 225% of baseline. The sensitized rats presented decreased quasistatic compliance, forced vital capacity, and end-expiratory flow, with all three lung function indexes showing a significant negative correlation with corresponding PL values. They also showed significant positive correlations of PL with the N2, He, and SF6 phase III slopes, reflecting diffusion-convection-dependent inhomogeneities generated by conformation changes throughout the entire rat lung. In addition, the rats showing the most marked PL increases (>150% baseline PL) also revealed a reversal of the SF6-He slope difference because of a more marked SF6 than He slope increase. This latter finding suggests that the degree of structural heterogeneity during early response is even more marked in the most peripheral rat lung generations.

Brown-Norway rats; early response; diffusion-convection-dependent inhomogeneity


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