Journal of Applied Physiology
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J Appl Physiol 18: 233-243, 1963;
8750-7587/63 $5.00
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Cardiogenic oscillations as an index of pulmonary blood flow distribution

K. T. Fowler 1 and John Read 1

1 Department of Medicine, University of Sydney, Sydney, Australia

A relationship has been developed between the amplitudes of cardiogenic oscillations of expired gas tensions and the ratio of blood flows through upper and lower zones of the erect human lung. Instrumental methods have been devised for the accurate measurement of the amplitudes of these oscillations. A theoretical and experimental study was made of the sources of error. The ratio of upper- to lower-zone blood flow could be determined with a reproducibility of ±20% so that changes in this ratio of greater than 20%, attendant upon a stimulus, could be identified.

Submitted on July 16, 1962




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