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目的探讨最大呼气峰流速（ＰＥＦＲ）下降率与哮喘发病的关系。方法用简易呼气峰速仪测ＰＥＦＲ每天３次共１５天，观察ＰＥＦＲ变化并指导用药。结果①对照组和哮喘组缓解期ＰＥＦＲ下降率＞１０％者分别占５％和８６％，发作期下降率≥２５％者占９３８％，Ｐ＜００１，有显著性差异。②ＰＥＦＲ下降率和发病呈正相关；下降率＜２０％者无一例发病，随着下降率增加发病人次也随之增加。结论简易呼气峰速仪所测ＰＥＦＲ下降率可作为哮喘发作与否和病情严重程度的判断依据，作为哮喘患儿进行自我监测的方法具有广泛的实用价值。
Objective To investigate the relationship between the decline rate of peak expiratory flow (PEFR) and the incidence of asthma. Methods PEFR was measured three times a day for 15 days with simple breath peak velocity to observe the changes of PEFR and guide the medication. Results ① In the control group and the asthma group, the PEFR reduction rate of> 10% in the remission period accounted for 5% and 86% respectively, and the descending rate of episodes of 25% or more accounted for 938%, P <001, with significant difference . ② The decline rate of PEFR was positively correlated with the incidence of the disease; the rate of decrease was less than 20%, and no one was found. As the rate of decline increased, the number of patients also increased. Conclusions The decline rate of PEFR measured by simple expiratory peak velocity meter can be used as a basis for judging the severity of asthma or asthma, and has a wide range of practical value as a method for self-monitoring of children with asthma.