<prompt> A 42 year old smoker has developed an acute anterior wall myocardial infarction. The coronary angiogram done on him is likely to show an obstruction of the -Left anterior descending aeryLeft posterior descending aeryRight coronary aeryCircumflex aery  <response>: Occlusion of the left anterior descending coronary aery LAD may cause infarction of the anterior wall of the left ventricle, manifested as precordial ST-segment elevations. Inferior ST-segment elevations due to occlusion of a LAD may reflect an ischemia of wrapped LAD aery . Ref Davidson 23rd edition pg444 