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(Circulation. 1965;32:435.)
© 1965 American Heart Association, Inc.

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Significance of the QX/QT Ratio and the QT Ratio (QTr) in the Exercise Electrocardiogram

LAURIAN ROMAN M.D.¹ SAMUEL BELLET M.D.¹

¹ From the Division of Cardiology, Philadelphia General Hospital, Philadelphia, Pennsylvania.

Recently, a junctional depression of small amplitude (less than 2 mm.) of the ST segment was considered to be a positive or equivocal result for the electrocardiographic exercise test if the QX/QT ratio was 50 per cent or the QTr 1.08.

In 150 normal, young students with no clinical evidence of heart disease, a junctional depression of the ST segment with a QX/QT ratio 50 per cent or a QTr 1.08 or both, was observed in 22 per cent.

These observations, supported by other published reports concerning the QX/QT ratio and the QTr, indicate that these criteria are not reliable for the determination of a positive electrocardiographic exercise test.

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