Abstract
OBJECTIVE--To compare measurements of the peak expiratory flow rate taken by the mini Wright peak flow meter and the turbine spirometer. DESIGN--Pragmatic study with randomised order of use of recording instruments. Phase 1 compared a peak expiratory flow type expiration recorded by the mini Wright peak flow meter with an expiration to forced vital capacity recorded by the turbine spirometer. Phase 2 compared peak expiratory flow type expirations recorded by both meters. Reproducibility was assessed separately. SETTING--Routine surgeries at Aldermoor Health Centre, Southampton. SUBJECTS--212 Patients aged 4 to 78 presenting with asthma or obstructive airways disease. Each patient contributed only once to each phase (105 in phase 1, 107 in phase 2), but some entered both phases on separate occasions. Reproducibility was tested on a further 31 patients. MAIN OUTCOME MEASURE--95% Limits of agreement between measurements on the two meters. RESULTS--208 (98%) Of the readings taken by the mini Wright meter were higher than the corresponding readings taken by the turbine spirometer, but the 95% limits of agreement (mean difference (2 SD] were wide (1 to 173 l/min). Differences due to errors in reproducibility were not sufficient to predict this level of disagreement. Analysis by age, sex, order of use, and the type of expiration did not detect any significant differences. CONCLUSIONS--The two methods of measuring peak expiratory flow rate were not comparable. The mini Wright meter is likely to remain the preferred instrument in general practice.
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Selected References
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- Bland J. M., Altman D. G. Statistical methods for assessing agreement between two methods of clinical measurement. Lancet. 1986 Feb 8;1(8476):307–310. [PubMed] [Google Scholar]
- Gunawardena K. A., Houston K., Smith A. P. Evaluation of the turbine pocket spirometer. Thorax. 1987 Sep;42(9):689–693. doi: 10.1136/thx.42.9.689. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hosie H. E., Nimmo W. S. Measurement of FEV1 and FVC. Comparison of a pocket spirometer with the Vitalograph. Anaesthesia. 1988 Mar;43(3):233–238. [PubMed] [Google Scholar]
- Oldham H. G., Bevan M. M., McDermott M. Comparison of the new miniature Wright peak flow meter with the standard Wright peak flow meter. Thorax. 1979 Dec;34(6):807–809. doi: 10.1136/thx.34.6.807. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Perks W. H., Tams I. P., Thompson D. A., Prowse K. An evaluation of the mini-Wright peak flow meter. Thorax. 1979 Feb;34(1):79–81. doi: 10.1136/thx.34.1.79. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Usherwood T. P., Barber J. H. Discrepancy between standard and low range mini Wright peak flow meters. Br Med J (Clin Res Ed) 1986 Feb 22;292(6519):523–524. doi: 10.1136/bmj.292.6519.523. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wright B. M. A miniature Wright peak-flow meter. Br Med J. 1978 Dec 9;2(6152):1627–1628. doi: 10.1136/bmj.2.6152.1627. [DOI] [PMC free article] [PubMed] [Google Scholar]