DOUGLAS R. HANSMANN, PH.D.; JOSEPH J. SHEPPARD, PH.D.
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To the editor: The letter in the December 1972 issue "Artifacts in Portable ECG Monitoring" (Ann Intern Med 77:1004) described two malfunctions that may occur during the use of the Holter monitor, also known as dynamic electrocardiography (DCG). Two malfunctions were described: pseudotachycardia induced by an abnormally slow tape speed, which crowds the ECG complexes together; and apparently abnormal QRS complexes caused by improper erasure of a previously used DCG tape.
With regard to the first malfunction, an artificial tachycardia can be manifested by either a worn-out motor or an insufficiently charged battery. In the case of a worn motor,
HANSMANN DR, SHEPPARD JJ. ECG-Monitor Artifacts. Ann Intern Med. 1973;78:619. doi: https://doi.org/10.7326/0003-4819-78-4-619
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Published: Ann Intern Med. 1973;78(4):619.
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