Key result
Magnetocardiogram mapping captures detailed cardiac electrical activity missed by standard surface ECG.
Why the study?
Understanding and assessing the magnetocardiograph requires mapping the magnetic field produced by electrical heart activity to interpret its features.
Observational (n=7)
To understand and assess the magnetocardiograph, the magnetic field produced by electrical heart activity was mapped around the torsos of one abnormal and six normal heart subjects, at different times during QRS. The measurements are here presented in the form of instantaneous distributions of vector segments 6 cm from the skin, anteriorly. An electrical model is presented which explains the first-order features of these distributions. This model is a simple, rotating bipole heart source of changing strength which produces the same ion currents as measured with surface electrocardiograms and vectorcardiograms; these currents produce a time-changing magnetic field extending outside the torso. Further analysis of second-order details of the distributions can reveal information not obtainable with various forms of surface electrocardiography.
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Cohen et al. (1969) conducted an observational in Normal and abnormal electrical heart activity (n=7). Magnetocardiogram mapping was evaluated on Instantaneous distributions of vector segments of the magnetic field. Magnetocardiogram mapping of the torso supported an electrical model of a rotating bipole heart source, revealing second-order details not obtainable with surface electrocardiography.
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