nuclear stress test question

[momto2]

Hi! I have question about a nuclear stress test I had just recently. I am a 41y/o female. non-smoker, 170lbs. 5'10. Exercise sporadically. I have had what I consider borderline high cholesterol at 180-215. Triglycerides occasionally high at 250-350(last result was 116 however) I have been having some chest discomfort not seemingly related to anything. Nothing relieves the discomfort when I am having it. Mostly it is across my back and shoulders and somewhat in my chest. Anyway, it prompted a visit to my cardiologist just to make sure. I have a hx. of frequent PVCs (10,000/day). I am not aware of any significant family history of heart disease. I did fine on the resting nuclear part as well as on the treadmill. I reached my target heartrate with no chest pain or SOB. No EKG changes. However when I picked up a copy of my stress test report it said the exercise portion of the nuclear test was abnormal. It said "subtle distal anterior ischemia". Everything else was WNL. In your opinion, how likely is this to be a false positive considering my history? They have ordered a CT scan. Does this seem like an appropriate course of action?  What does it mean when they say "subtle?" Less likely I hope. Any opinion would be great.