QT dispersion during dobutamine stress J echocardiography as an index for l myocardial viability in patients with old c myocardial infarction

Sameh Samir Raafat Naguib,

Abstract


QT dispersion and myocardial viability have been associated with the presence of arrhythmias during late post infarction period. Restoration of anterograde coronary flow has beneficial effects on ventricular systolic function and repolarization suggesting that the extent of viable myocardium may determine ventricular repolarization.
This study sought to investigate the relationship of myocardial viability detected by dobutamine stress
echocardiography to changes of QT dispersion and to the presence of arrhythmias during dobutamine infusion in patients with old myocardial infarction.
Thirty patients with previous myocardial infarction (one
of them was excluded for difficulty in differentiation between T and U wave) were studied in a low dose (up to 10 mug/Kg/min) dobutamine stress echocardiography study. ECGs were obtained at rest and peak stress for measurement of QT dispersion. The presence of ventricular arrhythmias, ST segment elevation and chest pain during stress were noted.
Patients with myocardial viability showed positive correlation and significant statistical difference as regard percent reduction of wall motion score (PThose patients also showed a greater increase in the percentage of QT dispersion with a significant P-value of


Other data

Title QT dispersion during dobutamine stress J echocardiography as an index for l myocardial viability in patients with old c myocardial infarction
Other Titles تشتت فاصل QT أثناء فحص الموجات الصوتية بالمجهود الدوائى كمؤشر على حيوية عضلة القلب فى مرضى الاحتشاء القديم لعضلة القلب
Authors Sameh Samir Raafat Naguib
Issue Date 2002
URI http://research.asu.edu.eg/handle/123456789/170442

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