W. CHANNING NICHOLAS, M.D.; JAMES L. HODGSON, PH.D.; STEVEN E. LINBERG, M.S.
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To the editor: We were intrigued with Aronow and Cassidy's timely paper, "Effect of Carbon Monoxide on Maximal Treadmill Exercise. A Study in Normal Persons" (Ann Intern Med 83:496-499, 1975). Their stated purpose was to confirm a decrease in exercise performance and to study the effects, on the exercise electrocardiogram, on normal middle-aged-persons who were exposed to low levels of carbon monoxide such that their carboxyhemoglobin levels were about 4.0% ± 0.5%.
We were disappointed to discover that the electrocardiograms presented were not taken during exercise but at rest, and (alas) supine.
The two traces shown (left and center traces)
NICHOLAS WC, HODGSON JL, LINBERG SE. Carbon Monoxide and Electrocardiograms. Ann Intern Med. 1976;84:495–496. doi: https://doi.org/10.7326/0003-4819-84-4-495
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Published: Ann Intern Med. 1976;84(4):495-496.
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