From what I read it is probably a slight arrhythmia (abnormal heart rhythm)which many folks have and really isn't anything to worry about. My Echo showed one about 5 years ago but so far every EKG I've had sense has never shown it to be worse. The sinus rhythm is sometimes too fast or too slow. I know I get what feels like skipped beats. It's scary but Cardio guy told me he has it as well and not to worry about it.
Hope this helped...JJ...
When you come to the end of your rope..tie a knot and hang on!
"slightly redundant atrial septum" Thats, to me, like saying you have an, i.e. "slight" problem parallel parking. Regardless, its still a problem. Except this is the Quarterback of your body. Be the offensive guard...Protect your Quarterback. Find an answer, then rest easy