ROGER M. KATZ, M.D.
To the editor: The studies by Ferguson, Addington, and Gaensler (1) do not appear to support their conclusions. Although the authors rightfully point out the possibility of an association between dyspnea and hypocapnia, their methods and results are weak in supportive data. It can be noted that their patient selection doesn't differentiate asthmatic patients with exercise-induced bronchospasm from the other groups. In addition, the study spans 19 years, and this is reflected in the individual patients' recorded data. Thus, the studies are probably not done at similar times nor under similar conditions. Most important, the charts and the figure differ
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KATZ RM. Inappropriate Postexercise Hyperventilation. Ann Intern Med. 1970;73:138. doi: 10.7326/0003-4819-73-1-138_1
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Published: Ann Intern Med. 1970;73(1):138.
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