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European Heart Journal 1989 10(3):268-272;
Copyright © 1989 by the European Society of Cardiology.
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© 1989 The European Society of Cardiology

An accurate exercise lead system for bicycle ergometer tests

L. EDENBRANDT, O. PAHLM and L. SÖRNMO

Department of Clinical Physiology, University of Lund Lund Sweden

Received 7 July 1988; revised 21 September 1988; .

Address for correspondence: Lars Edenbrandt, Department of Clinical Physiology, University Hospital, S-221 85 Lund, Sweden

Abstract

In order to minimize muscle noise in the exercise electrocardiogram, Mason and Likar proposed a new lead system where the limb electrodes are instead placed on the trunk. The Mason-Likar system is widely used for both the resting ECG before exercise and recordings during exercise. Several studies have, however, reported great differences between this lead system and the standard lead system. This study shows greater R wave amplitudes in leads II, aVF and III, smaller R wave amplitudes in leads aVL and I and thus a vertical shift of the frontal plane QRS axis for the Mason-Likar system compared with the standard system. For many years another lead system for exercise tests with the bicycle ergometer has been used in our laboratory. The limb electrodes are placed at the proximal part of the arms and the left iliac crest. This lead system yields ECG signals with a low level of muscle noise. The differences between this lead system and the standard ECG are much less pronounced than the differences between the Mason-Likar ECG and standard ECG. We propose our lead system for exercise tests with the bicycle ergometer.

Key Words: Electrocardiography • exercise test • lead system • computer-assisted diagnosis


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