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Signficance of Measurement of Peak Expiratory Flow to Classify the Severity of Asthma

Wang Zongfen; Zhou Zeyun;Wang Changzheng;et al.( Institute of Respiratory Diseases,Xinqiao Hospital. Chongqing.)  
A classification of asthma based on severity is of importance when decisions have to be made about the treatments in the stepwise approach recommended by Global lnitiative for Asthma (GINA ). The regressional formula of peak expiratory flow(PEF) was set up on thd basis-of determination of 1394 tealthy non-smoker persons in Chongqing area by miniWight PEF meters. 134 patients with asthma were classified into mild,moderate and severe grade by their symptoms under the criteria on made by Chinese Respirology Association and their PEF were rneasured in remission. By the percentage of prediction PEF of the measured readings≥80%,60~80% or≤60%,the patients also were classified into mild,moderate and severe grades respectively. The results show that two of classifications were not completely identical.71. 4% mild and 74. 5% severe patients with asthma classifield by symptoms had same grade as classification by PEF measurement. But only 52. 9 % moderate patients was consistent with grade by PEF methods. In conclusion,appropriate classification of asthma severity should be on the basis of measurement of symptoms and PEF or conventional lung functions. Otherwise,some of patients'severity will be underestimate.
【CateGory Index】: R562.25
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