Errors in the measurement of total respiratory resistance and reactance by forced oscillations
| Autor: | F.J. Làndsér, K.P. van de Woestijne, J. Nagels, J Clément |
|---|---|
| Rok vydání: | 1976 |
| Předmět: |
Pulmonary and Respiratory Medicine
Physiology Chemistry Airway Resistance Physics::Medical Physics Reactance Mechanics Respiratory Function Tests Superposition principle Forced Oscillation Technique Amplitude Respiratory impedance Harmonics Breathing Humans Diagnostic Errors Respiratory system Mathematics |
| Zdroj: | Respiration Physiology. 28:289-301 |
| ISSN: | 0034-5687 |
| DOI: | 10.1016/0034-5687(76)90024-4 |
| Popis: | The total respiratory resistance determined by means of the forced oscillation technique during spontaneous breathing demonstates a variability which may be due (1) to variations of the resistance itself, (2) to the superposition of rapid oscillatory and slow respiratory signals, (3) to the presence in the breathing signals of harmonics the frequency of which is the same as that of the oscillations. In the present study, we investigate the importance of the third cause of variability, in a mechanical system in which causes 1 and 2 have been excluded. It is shown that the presence of high frequency components in breathing is an important source of error in the measurement of instantaneous resistance and reactance. The error is larger at higher frequency and amplitude of breathing, lower frequency and amplitude of forced oscillations, and in the presence of a high respiratory impedance. The error is likely to be negligible when the frequency of the forced oscillations is high ( e.g. 30 Hz). At lower frequencies, the influence of harmonics in breathing can be corrected by calculating average resistance or reactance values over one or more respiratory cycles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|