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(Chest. 1959;36:624-630.)
© 1959 American College of Chest Physicians

The Helium Closed Circuit Method for Measuring the Functional Residual Capacity

R. J. DiSALVO M.D.1 and UNOJI GOTO M.D.2

1 Assistant Clinical Professor of Medicine, University of Cincinnati College of Medicine; Chief, Cardiopulmonary Section, Veterans Administration Hospital.
2 Fellow in Cardiopulmonary Diseases, Veterans Administration Hospital.

1. The simplified helium method for measuring the FRC is described and results obtained in normal and emphysematous subjects are presented.

2. Minute-to-minute changes in helium concentration during the rebreathing period may be plotted against time to represent qualitative changes in intrapulmonary gas mixing. These curves correlate well with the severity of the emphysema.

3. The method is sufficiently accurate for routine clinical use.






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Copyright © 1959 by the American College of Chest Physicians.