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(Circulation. 1950;2:5.)
© 1950 American Heart Association, Inc.

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An Integrating Circuit for Measurement of the Areas of the Waves in the Electrocardiogram

FRANKLIN D. JOHNSTON M.D.¹; RICHARD MCFEE M.S.¹; J. MARION BRYANT M.D.¹

¹ From the Department of Internal Medicine, Unicersity of Michigan Medical School.

An electronic circuit capable of integrating the electrocardiogram is described. The net areas of the QRS complex, the T wave and of the entire ventricular complex, QRS-T, in the standard leads may be estimated by measurement of the length of two vertical lines in each of the integrated records. The manifest areas of QRS, T and the gradient (QRS-T) with the orientation of these vectors are easily calculated from the data. An example of an integrated electrocardiogram is reproduced, and the procedure for estimation of the gradient is presented.