Computation of the equivalent airway resistance: a comparison with routine evaluations of plethysmographic measurements

Equivalent (effective) values of airway resistance were determined for total breaths, inspiration and expiration in spontaneously breathing patients by means of an off-line processing system. An improvement in the alveolar pressure determination was achieved by subtracting thermal pressure drifts of...

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Bibliographic Details
Published inRespiration Vol. 36; no. 2; p. 64
Main Authors Hantos, Z, Galgóczy, G, Daróczy, B, Dombos, K
Format Journal Article
LanguageEnglish
Published Switzerland 1978
Subjects
Airway Resistance
Computers
Humans
Lung Diseases, Obstructive - physiopathology
Plethysmography, Whole Body
Pulmonary Alveoli - physiology
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Summary:Equivalent (effective) values of airway resistance were determined for total breaths, inspiration and expiration in spontaneously breathing patients by means of an off-line processing system. An improvement in the alveolar pressure determination was achieved by subtracting thermal pressure drifts of the pressure plethysmograph and by taking into account instantaneous values of the intrathoracic gas volume. Equivalent resistance values were compared with the results of several simulated routine evaluations. It was found that the equivalent resistance is best approximated by the graphical procedure using average pressure points at +/- 0.5 liter/sec flow levels.
ISSN:0025-7931
DOI:10.1159/000193928