Quirce S, Contreras G, Morán O, Abboud R, Kennedy S, Dimich-Ward H, Chan-Yeung M
Vancouver General Hospital, Department of Medicine, University of British Columbia, Canada.
J Asthma. 1997;34(4):305-12. doi: 10.3109/02770909709067220.
A mini-Wright based peak flow meter (VMX Mini-Log), which stores the readings together with the time and date of each measurement, has recently been marketed but has not yet been evaluated. The accuracy, reproducibility, and interdevice variability of this instrument were investigated using a pneumotachograph connected in series as a standard. Flows from 100 to 700 L/min were generated by an explosive decompression chamber. The performance of this instrument was also tested in 20 normal subjects and in 20 patients with airflow obstruction. The accuracy of the instrument was expressed as the percentage of error, and reproducibility and interdevice variability were assessed using the coefficient of variation. In the laboratory evaluation, all devices recorded flow rates that were within +/-10% of the pneumotachograph readings at flows between 200 and 600 L/min. At the extreme flow rates of 100 and 700 L/min, the mean error was higher than 10%. The reproducibility of the VMX was within +/-5% at all the flows tested. The interdevice variability was less than 5% at flow rates between 200 and 700 L/min. When tested on normal subjects with PEF between 400 and 700 L/min, the VMX performed well. In patients with airflow obstruction, four devices had greater than 10% error. The largest error was observed in those patients with PEF below 200 L/min. The VMX Mini-Log peak flow meter is accurate and precise in the flow range between 200 and 600 L/min. Its performance, however, may be affected in subjects with airflow obstruction and PEF below 200 L/min.
一种基于小型赖特式的峰值流量计（VMX Mini-Log）最近已投放市场，它能将每次测量的读数与时间和日期一同存储，但尚未经过评估。使用串联连接的呼吸流速计作为标准，对该仪器的准确性、可重复性和设备间变异性进行了研究。通过一个爆炸减压室产生100至700升/分钟的气流。还在20名正常受试者和20名气流阻塞患者中测试了该仪器的性能。仪器的准确性以误差百分比表示，可重复性和设备间变异性使用变异系数进行评估。在实验室评估中，所有设备记录的流速在200至600升/分钟的气流下，均在呼吸流速计读数的±10%范围内。在100和700升/分钟的极端流速下，平均误差高于10%。VMX在所有测试气流下的可重复性在±5%以内。在200至700升/分钟的流速下，设备间变异性小于5%。在峰值呼气流量（PEF）为400至700升/分钟的正常受试者中进行测试时，VMX表现良好。在气流阻塞患者中，有四台设备的误差大于10%。在PEF低于200升/分钟的患者中观察到最大误差。VMX Mini-Log峰值流量计在200至600升/分钟的流量范围内准确且精确。然而，在气流阻塞且PEF低于200升/分钟的受试者中，其性能可能会受到影响。
