I've already posted this on the UK Yahoo site, but I'm putting it up here as well because its good to hear of new and more effective techniques.
It is early days, but a very interesting report from the USA is suggesting that there are more effective sites to ablate than just the pulmonary veins, in other words just doing PVI is not always effective. We knew that really because of the variable success rates, but its good to know of reasons and progress. See:
Regards to all, Chris H