Test performance of electronic recording peak flow meters.
Stemple KJ; Tift B; Reynolds SJ; Weisman DN
Am J Respir Crit Care Med 2002 Apr; 165(8)(Suppl):A497
Electronic recording peak flow meters (EPFM) are increasingly being used for ambulatory monitoring of asthma The EPFM's decrease errors associated with manual entry of time and peak expiratory flow rate (PEFR) data into diaries. However, only limited data documents the performance of these devices in measuring PEFR. Four types of EPFM were evaluated. A computer-controlled piston was used to deliver the 26 flow-time waveforms recommended by the ATS for assessing performance in PEFR measurement. An algorithm accounting for EPFM resistance and gas compression was used to assure accurate delivery of waveforms. For 2 types of EPFM we assessed 10 devices and for the other 2 types we assessed 3 devices. Accuracy, intradevice precision, and interdevice precision were calculated as recommended by the A TS. Correlation between delivered and measured PEFR and coefficient of variation (CV) in measurement at each waveform was also assessed for each type of EPFM. All 4 types of meters met ATS standards for accuracy. Within the limits of numbers of devices studied, all meters met standards for intradevice precision and 2 of the 4 meters met standards for interdevice precision. Delivered and measured PEFR for a114 meters were strongly correlated, with r values ranging between 0.987 and 0.999. CV's over the range of PEFR studied for the various EPFM ranged between 0.2% and 9.5%. The EPFM studied performed well from the standpoint of accuracy in measuring PEFR They were more variable in their precision. However, the tested EPFM have performance characteristics that appear sufficient for ambulatory monitoring PEFR.
Electronic-components; Electronic-devices; Electronic-equipment; Monitors; Monitoring-systems; Respiratory-function-tests; Pulmonary-disorders; Pulmonary-function-tests
Abstract; Conference/Symposia Proceedings
Disease and Injury; Asthma and Chronic Obstructive Pulmonary Disease
American Journal of Respiratory and Critical Care Medicine, 2002 International Conference, The American Thoracic Society, Atlanta Georgia, May 17-22, 2002