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(Circulation. 1954;10:850.)
© 1954 American Heart Association, Inc.

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Repeat Variability of Spatial QRS and T Vectors

ERNST SIMONSON M.D.¹ ANCEL KEYS PH.D.¹

¹ From the Laboratory of Physiological Hygiene, University of Minnesota, Minneapolis, Minn.

In spite of the increasing literature on spatial electrocardiographic vectors, no information on their repeat variability is available. Such data are presented in this paper and compared with the repeat variability of conventional electrocardiographic items, as background for interpretation of changes in direction and magnitude of spatial vectors in patients.