PEDIATRICS Vol. 44 No. 3 September 1969, pp. 393-400
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THE PHYSIOLOGIC SIGNIFICANCE OF GRUNTING RESPIRATION

J. H. Knelson M.D.1, W. F. Howatt M.D.1, and G. R. DeMuth M.D.1

1 Department of Pediatrics, University of Michigan Medical School, Ann Arbor, Michigan

The effect of grunting respiration before and after induction of pneumonia was studied in 14 experiments on five dogs artificially ventilated with a modified piston respirator. An end-inspiratory pause was produced which was exactly the same duration as the pause that usually occurs after normal expiration. Only the respiratory pattern was changed; frequency, tidal volume, and flow rates remained constant. Before pneumonia, grunting produced a mean increase in PaO2 of 10.5% (± 7.0%), a mean decrease in PaCO2 of 11.0% (± 5.1%), and a mean increase in VA of 21.8% (± 9.5%). The results after pneumonia were not significantly different. Intrapulmonary gas distribution was somewhat improved by grunting in normal lungs, but the ellect was not as pronounced after pneumonia.

Submitted on November 22, 1968
Accepted on April 8, 1969




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