Coronary disease. Ischemic heart disease means part of your heart muscle does not appear to be getting enough oxygen. Inferior lateral simply describes the area of the heart involved. You should consult a cardiologist.
Heart artery narrow. This term means that the coronary artery branch which feed the bottom/side wall of the heart has narrowing/"blockage" this finding is most likely made from a nuclear stress test. An angiogram would be a definitive test for the location, degree of blockage and if it can be safely opened with angioplasty and stent placement.