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European Heart Journal 1989 10(1):8-15;
Copyright © 1989 by the European Society of Cardiology.
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© 1989 The European Society of Cardiology

Magnetocardiographic studies of ventricular repolarization in old inferior myocardial infarction

M. NOMURA, Y. NAKAYA, K. FUJINO, S. ISHIHARA, M. KATAYAMA, A. TAKEUCHI, K. WATANABE, Y. HIASA, T. AIHARA and H. MORI

The Second Department of Internal Medicine, School of Medicine, The University of Tokushima and Department of Cardiology Komatsushima Red Cross Hospital Japan

Received 5 May 1988; revised 15 July 1988; .

Address for correspondence. Yutaka Nakaya M.D., The Second Department of Internal Medicine, School of Medicine, The University of Tokushima, 2–50 Kuramoto-cho, Tokushima, Japan 770

Abstract

Isomagnetic maps of 50 normal subjects (control group) and 23 patients with old inferior myocardial infarction (IMI group) were recorded in order to analyse T wave abnormalities in inferior myocardial infarction. The T wave of the magnetocardiogram (MCG) in the control group showed negative deflections in the left upper portion and positive deflections in the right lower portion, thus resulting in a T vector directed leftward and inferiorly. The T wave of the IMI group was flat or positive in the left upper portion and flat or negative in the right lower portion, suggesting a T vector directed superiorly. In addition, opposing dipoles were observed in 36.4% of the IMI group; i.e. one directed superiorly, presumably due to inferior myocardial ischaemia, and the other directed inferiorly due to normal repolarization. Localized T vector abnormalities could be detected by the MCG in some cases, in which coronary T waves of the standard electrocardiogram had returned to normal. Furthermore, multiple dipoles were more frequently observed in the isomagnetic map than in the isopotential map (5 vs. 15; P < 0.01). These results suggest that the MCG is helpful in diagnosing myocardial ischaemia when this is not detectable on the electrocardiogram.

Key Words: Magnetocardiogram • T wave • multiple dipoles • inferior myocardial infarction


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