A lot of the problems are down to the software in later ECG machines. They try to save time by performing an evaluation of the readings, but they are a long way off of being accurate. This is why your Doctor said not to worry about it. If we believe half the interpretations given by machines, then half of us would be having unnecessary bypass surgery. There are many factors to take into account when analysing an ECG and the Human expert is still the best at this job. I remember three years ago, having an ECG while in the Cardiac ward. A Doctor came over and said it was abnormal, and he even showed me the area of the trace which was abnormal. Later that day my Consultant Cardiologist arrived and asked how I was feeling. I told him about my ECG and he retrieved it from my notes. I showed him the abnormality and he just frowned and said "Absolute nonsense, this is perfectly normal, I will be having words with that Doctor". I was worried about this, obviously differences of opinions always cause concern because you wonder who could be right or wrong. I looked at some traces on the internet and discovered that the small bleep on the trace should have been there and was not abnormal. It was the P wave. the depolarization of the Atria.
Hello and hope you are doing well.
ECG is an electrical conduction study and it could sometimes give results, which need to be correlated clinically for a proper understanding. So, please don't worry, if your doctor has reassured you, its unlikely you have angina or cardiac pain. Do you have a positive family history for angina? If your symptoms of chest pain persist, a treadmill or an exercise ECG may help.
Hope this helped and do keep us posted.
direct links to the pictures.
http://i46.tinypic.com/1444jv5.jpg
http://i48.tinypic.com/2mww0t4.jpg
http://i49.tinypic.com/10omp0j.jpg