Details

Autor(en) / Beteiligte

• Zeck, R.T.
• Solliday, N.H.
• Celic, L.
• Cugell, D.W.

Titel

Variability of the Volume of Isoflow

Ist Teil von

• Chest, 1981-03, Vol.79 (3), p.269-272

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

1981

Quelle

MEDLINE

Beschreibungen/Notizen

• Twenty healthy hospital workers produced maximal expiratory flow-volume curves before and after three vital capacity inhalations of an 80 percent helium and 20 percent oxygen mixture (HE+O2) in the morning and afternoon for four days during one week. Ten healthy trade union apprentices underwent the same tests, twice on one day and again one month later. Measurements made from curves (and their mean coefficients of variation) were: Viso V˙ (105 percent), FVC (3 percent), FEF50% (6 percent), FEF75% (8 percent), the ratio of FEF50% breathing He+O2 to FEF50% breathing air (6 percent), and the ratio of FEF75% breathing He+O2 to FEF75% breathing air (9 percent). Differences among separate observers contributed significantly to the high variability of the Viso V˙. Diurnal changes and training effects over the week of study were not significant In conclusion, Viso V˙ is poorly reproducible compared with the FVC and expiratory flow rates at low lung volumes breathing air and He+O2. This should be considered when interpreting results in a given individual.