Thanks for the info Colleen. It took me awhile to understand what afib is all about. I have been living with it for about 2 years now and don't know what causes it for me. I know at times if I am exercising or walking it can start up but hate to say that is the cause because so many articles tell you to do that to prevent it. I do have hyperthyrodism but it is very mild. I cannot say I know if the afib would have happened anyways or if walking has caused it. That is why I want to learn more. I would take medicine if I knew it would stop it but that doesn't seem to be the case for me. My episodes scare me. I have a heart rate monitor and it goes to 208 and can take 2 hours to get back to normal. I really find it difficult to deal with. Thanks again for the articles to read.