ISRAEL M. STEIN, M.D.
To the editor: In the article "Plasma Concentration of Procainamide and Prevalence of Exertional Arrhythmias" (Ann Intern Med 80:718-722, 1974), Gey and associates noted that "portable tape recorders . . . do not help to forecast exertional arrhythmias nor do they foretell the therapeutic potential of any drug under conditions of exercise stress." Several recent papers seriously question this judgment and the conclusions drawn by these authors.
Crawford and associates (1), who studied 50 patients after myocardial infarction, noted that both treadmill testing and Holter monitoring (portable tape recording) are required for complete arrhythmia detection and that Holter monitoring often
STEIN IM. Detecting Arrhythmias. Ann Intern Med. ;81:564. doi: 10.7326/0003-4819-81-4-564_1
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Published: Ann Intern Med. 1974;81(4):564.
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