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European Heart Journal 1980 1(3):213-223;
Copyright © 1980 by the European Society of Cardiology.
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© 1980 The European Society of Cardiology

The isopotential plot—a new method for the assessment of ST amplitude changes provoked by an exercise test

T. I. BJURÖ, K.-J. FALK and J.-E. ANGELHED

Department of Clinical Physiology, Sahlgrenska sjukhuset Göteborg and Department of Applied Electronics, Chalmers University of Technology Göteborg, Sweden

Received 4 January 1980; .

Requests for reprints to: Thorvald I. Bjurö Ass. Prof., Department of Clinical Physiology, Sahlgrenska sjukhuset, S-413 45 Goteborg, Sweden

A method is described for presenting ST changes provoked by the exercise test. ST amplitudes are measured by a computer which continuously samples six chest leads and two limb leads (I and II, from which six limb leads are obtained). The chest leads in standard positions 1–6 are regarded as a space dimension. Values for ST amplitudes, obtained 60 ms after the end of each QRS at the different electrode sites, are interpolated and presented against lime as isopotential lines. A similar plot is made for the limb lead ECGs.

In patients with coronary artery disease the isopotential lines give a picture of the ST amplitude changes that greatly facilitates the reading of the ST response from the test. The continuous sampling and filtering principles lead to increased precision of measurements and increased resolution in time.

The method is illustrated by exercise tests in five patients who have undergone coronary angiography.

Key Words: Exercise test • 12 lead ECG • computer averaging • ST amplitude • isopotential map • data presentation


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