I see if you look to the right on the page, "related expert forums" include heart rhythm and if you click on forums at the top of the page, it's listed there as well. But when you click to go there, all you see are some old questions answered by regular folks. I don't see any MD advice at all.
Have you tried:
http://www.medhelp.org/forums/Heart-Disease/show/114
?
I see that expert forum does indicate some replies by medical doctors. Or are you saying you can't post there or anywhere?
Interesting. They used to have doctors that dealt solely with heart rhythms. Perhaps it's closed down. You could still post a question on the expert heart disease forum. Probably not easy to get one in but you could try.