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(Circulation. 1973;48:725.)
© 1973 American Heart Association, Inc.

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Ischemic Polarcardiographic Changes Induced By Exercise

A New Criterion

GORDON E. DOWER M.B., FACC¹; ROBERT A. BRUCE M.D., FACC¹; JAN POOL M.D.¹; MAARTEN L. SIMOONS M.D.¹; MANFRED W. NIEDERBERGER M.D.¹; LAURA J. MEILINK M.D.¹

¹ From the Division of Cardiology of the Department of Medicine, University of Washington, Seattle, Washington, and the Thoraxcentrum, University Hospital, Dijkzigt, Rotterdam, The Netherlands.

The polarcardiographic responses to exercise in normal men, young and middle-aged, have been compared with those of men who show ischemic responses on the electrocardiogram. Changes in the ST-vectors are the most significant. These changes have been reduced to a single numerical quantity based on the spatial magnitude of the vector at the end of the QRS complex and the spatial direction of a vector occurring at a clearly specified time during the period of the ST-segment. The assets of polarcardiography are that it enables study of direction and magnitude of ST-vectors in a time sequence. Thus it provides information of clinical importance which cannot be obtained by either electro- or vectorcardiography.

Key Words: Exercise • ECG ST-segment depression • Myocardial ischemia • Polarcardiography

Submitted on December 6, 1972
Accepted on June 5, 1973