Hi,hope your not too worried however I can understand how you feel.
I must agree with the other post however,I would say please get a copy of the EKG and then give it to your personal doctor. If he is not able to say a yes or no then you must see a cardiac surgeon.I'm sorry but sadly some doctors are 100% idiots!.(especially those in ER rooms.)you must Play safe with this matter.But Like I said don't be too worried as I have seen two young 19 year olds in clinic whom are sports fanatics with the same problem.But you may need to be reviewed.
cheers john.
If the only finding on the EKG was a possible enlarged left atrium, then I would not be too concerned. An EKG is not a good tool to detect an enlarged atrium and many have had this on their EKG, including me. Even if you did have an enlarged left atrium, it is fairly common and is usually of little significance, depending on the size. It does not put you at risk of sudden cardiac death, the main complication is that it does increase your risk of Afib and stroke due to blood pooling in the atrium. The important thing is to find the underlying cause of the enlarged atrium which is usually high blood pressure.
Most EKG's are interpreted by a computer but read by a doctor who makes the final judgement as the computer interpretations are often incorrect. I would be concerned with a doctor that can't tell you the specifics of the interpretation, but he has been trained to read an EKG and if he says it's good, it most likely is. You can always have your personal doctor follow up as well.
I hope this helps,
Jon