Why the study?
Does QT dispersion during dobutamine stress echocardiography predict the presence of viable myocardium in patients with old myocardial infarction?
Does QT dispersion during dobutamine stress echocardiography predict the presence of viable myocardium in patients with old myocardial infarction?
Resting or dobutamine-induced changes in QT dispersion may serve as a simple clinical index for assessing myocardial viability in patients with prior myocardial infarction.
QT dispersion criteria may support viability assessment in prior MI; hypothesis-generating and requires prospective validation before clinical adoption.
The combination of a resting QT dispersion +/-65 ms or an increase in QT dispersion >30% predicts the presence of viable myocardium and thus, may represent a simple index for the assessment of viability in everyday clinical practice. Myocardial viability is related to a patent coronary artery and to a high incidence of arrhythmias accompanied by a greater increase in QT dispersion at peak dobutamine infusion.
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Ignatios Ikonomidis (2000) studied this question.
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