Variability of the volume of isoflow.
Variability of the volume of isoflow.
复制标题
等流体积的变化。
作者：
R. Zeck;N. Solliday;L. Celić;D. Cugell
20 名健康的医院工作人员在一周内连续 4 天早上和下午吸入 3 次 80% 氦气和 20% 氧气混合物 (HE+O2) 的肺活量之前和之后绘制了最大呼气流量曲线。十名健康的工会学徒也接受了同样的检查，一天两次，一个月后再一次。根据曲线（及其平均变异系数）进行的测量为：VisoV (105%) FVC (3%)、FEF50% (6%)、FEF75% (8%)、FEF50% 呼吸 He+O2 与 FEF50% 呼吸空气的比率 (6%)，以及 FEF75% 呼吸 He+O2 与 FEF75% 呼吸空气的比率 (9%)。不同观察者之间的差异极大地导致了 VisoV 的高度变异性。研究一周内的昼夜变化和训练效果并不显着。总之，与低肺容量呼吸空气和 He+O2 下的 FVC 和呼气流速相比，VisoV 的重复性很差。在解释给定个体的结果时应考虑这一点。
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: VisoV (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 VisoV. Diurnal changes and training effects over the week of study were not significant. In conclusion, VisoV 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.