Journal of Applied Physiology Journal of Applied Physiology
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J Appl Physiol 18: 47-50, 1963;
8750-7587/63 $5.00
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Effect of expiratory flow patterns on lung emptying

A. C. Young 1, C. J. Martin 1, and William R. Pace JR. 1

1 Firland Sanatorium and Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, Washington

Differences in expired alveolar gas concentrations with changes in expiratory flow were studied in single-breath experiments using nitrogen and carbon dioxide meters. High flow rates preferentially emptied lung areas having low ventilation-to-volume ratios and high ventilation-to-perfusion ratios, whereas low flow rates preferentially emptied areas of high ventilation-to-volume and low ventilation-to-perfusion ratios. Selective emptying of different lung areas by varying the expiratory flow pattern was not affected by age, sex, or body position. A model of the lung is proposed to explain how ventilation-to-volume ratio differences can be seen at mouth level during constant slow, varying, and constantly increasing or decreasing expiratory flow.

Submitted on May 4, 1962




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