Hankinson J L, Filios M S, Kinsley K B, Petsonk E L
Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, Morgantown, WV 26505, USA.
Chest. 1995 Aug;108(2):407-10. doi: 10.1378/chest.108.2.407.
The accuracy and instrument variability of the MiniWright (Clement Clarke) peak expiratory flow (PEF) meter was determined with 6 of the 24 American Thoracic Society's (ATS) standard waveforms using a mechanical pump. Both room air and air heated to 37 degrees C and saturated with water vapor were used. In addition, MiniWright-determined PEF measurements were compared with those obtained using a dry rolling-seal spirometer (Ohio No. 822; Ohio Medical Products; Madison, Wis) from 75 subjects on 2 different days. The MiniWright average coefficient of variation within a waveform was found to be 2.8%. Results using heated and humidified air (body temperature, ambient pressure, and saturated with water: body conditions) were 2.5% lower than those obtained using room air. Comparisons with mechanically simulated PEF and with spirometry-determined peak flow in 75 human subjects showed that MiniWright meters over-estimated flows at lower flow rates and slightly under-estimated flows at higher flow rates. These results suggest that the new "mechanical PEF" MiniWright scale should be used instead of the "traditional" MiniWright scale.
使用机械泵，通过美国胸科学会（ATS）24种标准波形中的6种，测定了MiniWright（克莱门特·克拉克公司）呼气峰值流速（PEF）仪的准确性和仪器变异性。使用了室内空气以及加热至37摄氏度并饱和水蒸气的空气。此外，在2个不同日期，将75名受试者使用MiniWright测定的PEF测量值与使用干式滚动密封肺活量计（俄亥俄822型；俄亥俄医疗产品公司；威斯康星州麦迪逊）获得的测量值进行了比较。发现MiniWright在一个波形内的平均变异系数为2.8%。使用加热和加湿空气（体温、环境压力和水蒸气饱和：人体条件）的结果比使用室内空气的结果低2.5%。在75名人类受试者中，将MiniWright与机械模拟的PEF以及肺活量测定确定的峰值流速进行比较，结果表明，MiniWright流量计在较低流速下高估了流速，在较高流速下略微低估了流速。这些结果表明，应使用新的“机械PEF”MiniWright刻度，而不是“传统的”MiniWright刻度。
