Comparison of airway resistance and total respiratory system resistance in infants

C. Springer, D. Vilozni, E. Bar-Yishay, A. Avital, N. Noviski, S. Godfrey

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Airway resistance (Raw) can be measured throughout the respiratory cycle by whole body plethysmography. Total resistance of the respiratory system (Rrs) can be measured from the relaxed expiration that follows end inspiratory occlusion. The purpose of this study was to compare the two methods in normal infants and in infants with airway obstruction of different types and severity. Fifteen infants with essentially normal lungs aged 24.6 ± 18.0 (SD) wk, nine infants with congenital stridor aged 36.0 ± 17.3 wk, and eleven wheezy infants aged 20.1 ± 11.3 wk had simultaneous measurements of Raw and Rrs. Rrs was similar to Raw both during inspiration and expiration in the normal infants, to all expiratory Raw in those with congenital stridor, and to all inspiratory and early expiratory Raw in the wheezy infants. Raw was markedly and significantly higher than Rrs during mid and late inspiration in infants with congenital stridor and during late expiration in the wheezy infants. We conclude that Rrs is a good estimate of Raw in normal infants and of early expiratory Raw in all infants. In infants with airway obstruction, Rrs does not reveal the dynamic changes in Raw during tidal breathing, nor can it differentiate between infants with upper and lower airway obstruction.

Original languageEnglish
Pages (from-to)1008-1012
Number of pages5
JournalAmerican Review of Respiratory Disease
Issue number4
StatePublished - 1 Jan 1993
Externally publishedYes

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine


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