If you have just one episode of AF your stroke risk is greatly increased. If the purported mechanism is correct i.e a small blood clot can form in a small pocket in the atrium and then get pumped out to the brain at a later date how come the risk isn't greater for people coming in and out of AF frequently (and apparently there is no evidence for that) And how come if you had one episode as time passes surely that clot would be broken down - nothing remains unchanged in your body for years surely? Also I suspect almost all of the population has at least one episode in their lifetime which would be the whole population has 5x the risk which would mean we all have the same risk!!
Furthermore, if it is thought to be caused by a clot in this pocket it is hard to believe with modern technology that there is no way through use of say, radiochemistry, dye technology or microcameras or some other means of identifying if there is a clot there? Or is it too expensive?
Some of this may sound daft but I've yet to get an explaination from any consultant on this!