What does a borderline ekg mean?

No such thing: Borderline ekg is like borderline diabetic or borderline pregnant.. No such thing! ekg shows the electrical impulses in the heart. There is a wide range of normal patterns; normal! there also other electrical deflections that are clearly not normal, i.E heart attack, hypertension, etc. I would recommend the ekg being viewed by an expert like an electrophysiologist, if your doctor is unsure.

Ecg : The findings above mean probably norma but the borderline findings mean it can't be called definitely normal.