Usually the next step is a stress
test, unless that has been done, then you would have an
angiogram which is the gold standard. EKG's are a an 8 second view of your heart while it is beating away. Unless it is read by a Cardiologist, it isn't always very accurate.
If you do in fact have an anteroseptal wall ischemia, there are degrees of severity, in my opinion. Keep in mind, I'm not a health professional,but have had a lot of angiograms and problems.