الفهرس 
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Abstract
Introduction:
Cardiovascular disease is the leading cause of death among both sex, and coronary artery disease is the commonest cause of cardiovascular disease. Myocardial infarction causes 35% of deaths in men between 35 and 50 years old. It is clinically important to estimate the size of myocardial infarction for predicting the prognosis and determining the ability of therapy to limit its size.
Aim of the work: was to validate the accuracy of ECG criteria for estimation of infarct size as compare to Tc-99m SPECT in patients
with STEMI.
Methodology:
This study included 108 patients with STEMI. All patients underwent:
1. History taking.
2. 12 lead resting ECG.
3. Rest Tc-99m Sestamibi myocardial perfusion SPECT study.
The patients were classified into two groups:
group I: Patients admitted to CCU with acute STEMI, analyzing for ST segment elevation Aldrich score, QRS Selvester score, and difference percent.
GroupII: Patients referred to myocardial perfusion scan lab to estimate the extent of infarct size by analyzing QRS Selvester score and number of leads with Q wave.
Results:
The mean age in the study was 55.9 ± 9.4 years old. There were 97 males and 11 females. Both subgroups were comparable as regards risk factors distribution.
Selvester QRS score was highly correlated in both acute and healed MI to the size estimated by SPECT While, number of the leads with Q wave was highly correlated in healed MI.
Conclusion:
Surface ECG is still of clinical value in estimating infarction size both in acute and healed phases. In acute myocardial infarction, Aldrich score of ST segment elevation and number of leads with ST segment elevation showed a valid method for estimating the size of infarction. In healed myocardial infarction, Selvester QRS score and number of leads with pathological Q wave can be used to estimate size of infarction. Percent difference between initial infarct size by Aldrich ST score and final size by Selvester QRS score was found to be a poor measure of infarct size.