If there were a problem, a shortened PR interval would almost always cause a faster than normal heart rate, etc. And an abnormal EKG wave form requires further evidence, and apparently your doctor doesn't have any additional evidence to support a finding, and you shouldn't be concerned.
You replied to Missy about now worrying over a short PR interval if she is in normal sinus rhythm. I too have been diagnosed with the same thing after an episode where my heart raced at 175 bpm. This is still there 6 weeks later and I am more than a little concerned. Can you be sure that a short PR interval really is nothing to worry about as It really would make me feel a lot better to know that. I cant get any answers from the doctors.
If the rhythm was Normal Sinus, you should not worry about the PR interval. your doctor could have pointed out any concerns.