首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Inhalation of adenosine 5'-monophosphate increases methacholine airway responsiveness
Authors:Rosati  G; Hargreave  F E; Ramsdale  E H
Institution:Department of Medicine, St. Joseph's Hospital, Hamilton, Ontario, Canada.
Abstract:Airway hyperresponsiveness is a characteristic feature in asthmatic subjects, but the mechanism of the hyperresponsiveness is not known. The purpose of this study was to investigate whether methacholine airway responsiveness was increased 24 h after inhalation of adenosine 5'-monophosphate (AMP). Ten atopic asthmatic subjects and six atopic normal subjects were studied on 4 study days. On the 1st day, a methacholine inhalation test was performed, followed within 48 h by an AMP inhalation test. Seven days later the second AMP test was performed, and 24 h later the methacholine inhalation test was repeated. Response was measured using partial flow-volume curves, and the concentration required to cause a 40% fall in the partial flow-volume curve (PC40) was calculated. The geometric mean methacholine PC40 fell from 1.36 mg/ml on day 1 (before AMP inhalation) to 0.71 mg/ml on day 4 (24 h after AMP inhalation, P less than 0.01). There was no change in the mean PC40 for adenosine on the 2 study days (5.82 and 7.06 mg/ml, P greater than 0.1). These findings suggest that adenosine release may contribute to the increase in airway responsiveness after allergen challenge.
Keywords:
点击此处可从《Journal of applied physiology (Bethesda, Md. : 1985)》浏览原始摘要信息
点击此处可从《Journal of applied physiology (Bethesda, Md. : 1985)》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号