Blokey would know if he had AF, wouldn't he? I only ask because he does have a slightly fast heartbeat (but other than that is heart is healthy and they don't know why he has a slightly fast heartbeat) and he is on warfarin. It's okay ... his INR is checked regularly. I was going to say that I really don't need one more thing to worry about, but as I worry about everything anyway I doubt this will fit into my worry schedule.