- BORDERLINE ECG - SINUS RHYTHM normal P axis, V-rate 50-99 PROBABLE LEFT ATRIAL ABNORMALITY P 50mS, Doctor said it was normal. I ve been having shortness of breath, chest pains and extreme fatigue for about 8 months. I have Lupus and Hypothyroidism. A full lung function test that I was told was normal and a chest xray- normal. I am a 53 and one half year old female with heart disease prevailant in my family. I ve had kidney and liver and blood involvement with my lupus in the past, but cannot tolerate any of the drugs to control it. I have a CT scan scheduled for tomorrow. I find it weird that there is nothing to show for the level of chest pain I ve been having....how can they say a test is normal, when the Dr s reading clearly said abnormal and borderline? Medical bills piling up and no answers...any suggestions about what the heck these numbers mean on this ECG?