| Autor: |
Svenonius, E., Kautto, R., Arborelius, M. |
| Zdroj: |
Lung; 1979, Vol. 157 Issue 1, p201-208, 8p |
| Abstrakt: |
All information in the flow-volume curve should be present in the forced expired volume curve recorded with a high fidelity spirometer. This hypothesis was tested by comparing $$\mathop V\limits^ \bullet $$ max25 (the flow at RV + 25% VC) measured from flow-volume curves obtained with a pneumotachograph system and an X-Y-oscilloscope with $$\mathop V\limits^ \bullet $$ max 25 measured from a forced expirogram recorded with a high fidelity spirometer. The flow at RV + 25% VC was derived by a line drawn through two points on the spirogram at ±0.1 sec. from this volume. Measurements were made on repeated identical FEV blows with different flow rates from an FEV simulator and on exhalations with various flows from two healthy volunteers. The reproducibility was equally good with both methods but a constant error was present in the pneumotachograph measurements (calibration error). In 50 healthy children $$\mathop V\limits^ \bullet $$ max 25/TLC obtained with a spirometer had the same magnitude and variability as found by previous authors using conventional flow volume records from a pneumotachograph system. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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