Clinical Significance of Precordial ST Segment Depression in Acute Inferior Myocardial Infraction and its Relation with Lesion of Coronary Artery

To study the significance of precordial ST segment depression in acute inferior myocardial infraction and its relation with lesion of coronary artery, 68 patients with inferior AMI were allocated into three groups based on the extent of precordial ST segment depression. Group 1(n = 19) had no precordial ST segment depression. Group 2( n = 14) had ST segment depression in V1-3. Group 3(n-35) had ST segment depression in V1-5 or V1-6. Results: The frequency of disease of left anterior descending artery(LAD) was 26.3% in group 1, 14.3% in group 2, 74.3% in group 3. The patients with LAD stenosis of more than 90% accounted for 34. 3% in group 3. The precordial ST segment depression in V1-5 or V1-6 in patients with inferior AMI suggest the presence of LAD lesion. The cause of ST segment depression in V1-5 or V1-6, may be due to anterior wall subendocardial ischemia caused by severe stenosis of LAD, and precordial ST segment depression in V1-3 indicates a reciprocal change.