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Science 16 December 1977:
Vol. 198. no. 4322, pp. 1159 - 1162
DOI: 10.1126/science.929192
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Articles

Science, Vol 198, Issue 4322, 1159-1162
Copyright © 1977 by American Association for the Advancement of Science

articles

Measurement of the human magnetic heart vector

WH Barry, WM Fairbank, DC Harrison, KL Lehrman, JA Malmivuo, and JP Wikswo Jr

A unipositional lead system has been developed to record the human magnetic heart vector and to permit comparison with the electric heart vector recorded with a conventional Frank lead system. Recordings made in five normal subjects showed a remarkably consistent relation between the electric and magnetic heart vectors. However, the angle between electric heart vector R and T waves was markedly different from the magnetic heart vector R-T angle. In addition, recordings made in two patients with bundle branch block showed a different relation between the electric and magnetic heart vectors compared to normal subjects. These data support the hypothesis that magnetic measurements have a different sensitivity to some components of cardiac activation compared with body surface potential measurements.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Noninvasive, direct visualization of macro-reentrant circuits by using magnetocardiograms: initiation and persistence of atrial flutter.
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Europace 5, 343-350
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Science. ISSN 0036-8075 (print), 1095-9203 (online)