I'm not familiar with ARVD at all, so I can't answer that, but I was just going to post something about the heart pounding. I wish I had an answer for you, but I'm kind of in the same boat with the palps, rapid heartbeat, and heart pounding.
I've had abnormal EKG's , but the doctor assured me that it was nothing to be concerned about. I also had Low Voltage QRS, although I don't know what it means. I've heard of others having that on their EKG's, so I guess it's not that abnormal.