I had mitral valve repaired about 1.5 years ago. I had a bout of Afib that lasted about 12 hours (I didn't know that's what it was at the time, but I was wearing a monitor.) I don't remember any similar episodes...I've actually been very happy with my post surgery rhythm (I used to skip beats all over the place...PVCs). My questions: Can one have an isolated instance of Afib? How would we find out if it's a recurring issue (I already wore the monitor for a month)? Is this still a side effect of surgery or something else entirely?