Cardiology doctors in Kattigenahalli, Bangalore • A ortic dissection and aneurysms A dissecting haematoma of the aortic root will cause severe chest and back pain but leads to ECG changes only if the coronary ostia are involved. The right coronary ostium is more often affected. Dissection into the coronary ostium usually causes its occlusion and results in an acute myocardial infarction. The diagnosis of dissection cannot be made from the There may, however, be evidence of pre-existing LVH in a high proportion of cases. Haemopericardium (tracking of blood from the dissection into the pericardial sac) is often the terminal event for these patients, but pericarditis-type ST elevation occurs only rarely.