الفهرس 
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Abstract
In this study we investigated the use of the surface ECG as a predictor of viability by evaluating the relation between Q wave myocardial infarction and myocardial viability using stress-reinjection thallium scintigraphy.
Also, we aimed to study the impact of Q wave regression on left ventricular function assessed by resting gated equilibrium radionuclide angiocardiography (ERNA).
In this study we found the following:
1- Most of Q wave regression in anterior MI was partial regression.
2- Q wave regression was not a marker of myocardial viability in anterior MI, as the amount of ischemic myocardium was equal between of ischemic myocardium was equal between patients with and without Q wave regression.
3- The global EF and the anterior regional EF tended to be better in patients with anterior MI and Q wave regression than in patients without Q wave regression, but this did not achieve statistical significance.
4- Most of Q wave regression in inferior MI was total regression (85.7%).
5- Q wave regression in inferior MI might be an indicator of better myocardial viability in lateral wall of those patients, as the inferior MI with Q wave regression group was associated with larger perfusion defect and greater amount of perinfarction ischemia in lateral wall than the other group with persistent Q wave, and the regional EF in post lateral and inferolateral segments and the lateral regional EF were significantly lower in patients with inferior MI and Q wave regression than in those without regression.
6- Inferior MI with Q wave regression was associated with a higher incidence of RV dilatation.
7- No significant differences as regard total or hard event rates between patients with Q wave regression and those without regression in neither anterior nor inferior IM.