A patient with exercise-induced asthma is described in whom the post-exercise fall in F.E.V.1 was not prevented by the inhalation of isoprenaline immediately before exercise but was almost completely prevented by subcutaneous atropine given 40 minutes before exercise. A large fall in F.E.V.1 similar to the fall after exercise occurred after carbon dioxide-induced hyperventilation and voluntary hyperventilation performed at rest. Only a slight fall in F.E.V.1 occurred when atropine was given before voluntary hyperventilation was performed. It is postulated that the post-exercise fall in F.E.V.1 in this patient is due to hyperventilation reflexly causing bronchial constriction.
Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.