Why the study?
Are the QX/QT ratio and QTr reliable criteria for determining a positive electrocardiographic exercise test in normal young students?
Are the QX/QT ratio and QTr reliable criteria for determining a positive electrocardiographic exercise test in normal young students?
The QX/QT ratio and QTr are not reliable criteria for determining a positive electrocardiographic exercise test, as they are frequently positive in normal individuals.
These criteria may yield false positives in young adults; challenges their reliability for exercise ECG interpretation and leaves open validation in diverse populations.
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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Roman et al. (1965) studied this question.
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