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Chest, Vol 101, 425-431, Copyright © 1992 by American College of Chest Physicians

ARTICLES

Frequency and correlates of the saw-tooth pattern of flow-volume curves in an epidemiological survey

F Neukirch, E Weitzenblum, R Liard, M Korobaeff, C Henry, E Orvoen-Frija and F Kauffmann
INSERM Unit 226, Paris, France.

The object of this report was to assess the possibility of identifying saw-tooth patterns on flow-volume curves in men aged 28 to 58 years. We studied the frequency of these patterns and their relationships with two indirect signs of UAO increase in FEV1/PEF and FEF50%/FIF50% ratios- -as well as with clinical and functional data. Twenty-six of the 360 subjects surveyed, ie, 7.2 percent, had flow oscillations in the inspiratory and/or expiratory part of flow-volume curves, corresponding to the definition of the saw-tooth pattern. We observed significant relationships between the saw-tooth pattern and the mean FEV1/PEF ratio. In 97 subjects, the proportion of those with saw-tooth patterns was 13.4 percent, and the mean FEF50%/FIF50% ratio was 1.53 in those with the pattern vs 1.07 in those without it. These results show that the saw-tooth pattern was not rare in these men.


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