My dad had a serious heart condition, lung condition and a blockage of the brain, out of breath all the time, couldn't walk anywhere for more than 5 minutes and angina. He ended up in a wheelchair. He did not have AF though, but my brother has it and has had this since he was at school, so very young, he is now in his 50's and still gets it from time to time but his goes back into normal rythmn. Also my Older son has tachycardia and I have AF. So I would say it is not co-incidental, there must be some connection.