الفهرس 
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Abstract
Aim of the work
The aim of this work is to determine the validity of QT dispersion in the assessment of myocardial viability in patients with chronic Q-wave myocardial infarction, as compared to a well established method of assessment: Dobutamine stress echocardiography.
Conclusion
1- Surface ECG QT dispersion, manually after x4 photocopy amplification, may be used as a simple, non-invasive and inexpensive method to estimate the extent of viable tissue in the infarct region in patients with chronic Q-wave myocardial infarction.
2- Shorter QT dispersion values < 70 ms indicate the presence of viable myocardium in the infarct region. Whereas increased values of QT dispersion < 70 ms indicate non viable myocardium in the infarct region. Other scintigraphic techniques, using FDG or thallium-201, and echocardiographic techniques are time consuming, expensive and usually available only at specialized medical centers.
3- Due to errors in reliable identification of T-wave offset and different T-wave amplitude by manual measurement, it might be more accurate to use sophisticated methods for accurate measurement of QT dispersion as computerized waveform analysis with automatic QT interval measurement for each lead.