Journal of Applied Physiology
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J Appl Physiol 89: 2030-2040, 2000;
8750-7587/00 $5.00
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Vol. 89, Issue 5, 2030-2040, November 2000

Size distribution of recruited alveolar volumes in airway reopening

Béla Suki1, Adriano M. Alencar1,2, József Tolnai3, Tibor Asztalos3, Ferenc Peták1,3, Mamatha K. Sujeer1, Keena Patel1, Jignish Patel1, H. Eugene Stanley2, and Zoltán Hantos3

1 Department of Biomedical Engineering and 2 Center for Polymer Studies, Department of Physics, Boston University, Boston, Massachusetts 02215; and 3 Department of Medical Informatics and Engineering and Institute of Surgical Research, University of Szeged, Szeged, Hungary

In 11 isolated dog lung lobes, we studied the size distribution of recruited alveolar volumes that become available for gas exchange during inflation from the collapsed state. Three catheters were wedged into 2-mm-diameter airways at total lung capacity. Small-amplitude pseudorandom pressure oscillations between 1 and 47 Hz were led into the catheters, and the input impedances of the regions subtended by the catheters were continuously recorded using a wave tube technique during inflation from -5 cmH2O transpulmonary pressure to total lung capacity. The impedance data were fit with a model to obtain regional tissue elastance (Eti) as a function of inflation. First, Eti was high and decreased in discrete jumps as more groups of alveoli were recruited. By assuming that the number of opened alveoli is inversely proportional to Eti, we calculated from the jumps in Eti the distribution of the discrete increments in the number of opened alveoli. This distribution was in good agreement with model simulations in which airways open in cascade or avalanches. Implications for mechanical ventilation may be found in these results.

atelectasis; lung elastance; avalanches; power law; percolation; gas exchange


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