الفهرس 
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Abstract
•STEMI is considered to be the most fatal presentation of ACS. Approximately thirty percent of MIs are STEMI. Analysis of the findings of ECG leads which reveals ST segment elevation could also be beneficial for determination of the location of occlusion in the infarct related artery. The aim of this work is to predict the site of obstruction in infarct related artery by assessment of correlation between RCA lesion location and severity of ST segment elevation in inferior limb leads in inferior STEMI. Predicting the location of obstruction in RCA with ECG is beneficial as proximal obstruction is predictable to develop larger damage of the myocardium, RVI, AV blocks, and hence major adverse cardiac outcomes. Our study included 30 persons who presented with inferior STEMI in Specialized Medical Hospital and Nasr City Insurance Hospital. All patients were subjected to the following : History taking. ECG. Physical examination. Routine laboratory investigation. Coronary angiography in the setting of primary PCI, rescue PCI, pharmaco-invasive, or in elective setting later on. The present study revealed the following results : In the setting of Inferior STEMI, the higher degree of ST segment elevation, and the proximity of the culprit lesion along the course of the RCA were showed to be closely related. The cutoff point is the most important part of the study as it represents the point that differentiates the site of the lesion in the RCA. If the amplitude of ST segment elevation greater than 7.5 mm, it will suggest that the lesion is in the proximal segment. On the other side, if the amplitude of ST segment elevation less than 7.5 mm, it will suggest that the lesion is in the mid or distal segments. The sensitivity of our cutoff point is 84.2% and the specificity is 63.6%. The present study concluded that : In the setting of Inferior STEMI, the higher degree of ST segment elevation, and the proximity of the culprit lesion along the course of the RCA were showed to be closely related.