Exercise-induced bronchospasm in children -: Effects of asthma severity

被引:95
作者
Cabral, ALB
Conceiçao, GM
Fonseca-Guedes, CHF
Martins, MA
机构
[1] Darcy Vargas Hosp, Pulm Pediat Div, Sao Paulo, Brazil
[2] Univ Sao Paulo, Sch Med, Dept Med, Sao Paulo, Brazil
[3] Univ Sao Paulo, Sch Med, Dept Pathol, Sao Paulo, Brazil
关键词
D O I
10.1164/ajrccm.159.6.9805093
中图分类号
R4 [临床医学];
学科分类号
1002 ; 100602 ;
摘要
The prevalence of exercise-induced bronchospasm (EIB) in asthmatic individuals has been reported to vary from 40% to 90%. There are, however, few studies addressing the effects of asthma severity on airway responsiveness to exercise. The purpose of the present study was to investigate the effects of asthma severity on EIB in children. We studied 164 children classified as having intermittent (n = 63), mild persistent (n = 30), moderate persistent (n = 40), and severe persistent asthma (n = 31) according to the Global Initiative for Asthma classification. Subjects exercised for 6 min on a cycle ergometer at 80% of their maximum heart rate, and spirometry was performed before and 5, 10, and 20 min after exercise challenge. The prevalence of EIB in children with moderate or severe persistent asthma was significantly greater than in children with intermittent asthma (p < 0.001). EIB-positive children with intermittent asthma exhibited smaller changes in FEV1 than children in the other three groups (p < 0.001). There was no significant relationship between baseline FEV1 and the decline in FEV1 after exercise. We conclude that the prevalence of EIB is greater in children with more severe asthma, and that the intensity of response to exercise is not consistently related to the clinical severity of asthma.
引用
收藏
页码:1819 / 1823
页数:5
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