I have been on AF fora for years now, and have never seen anyone post who has reported a dangerous outcome over a Watchman being implanted. The worst that can happen, as far as I can tell, is that the 'seal' doesn't take place over six months and that the appendage therefore continues to leak...which means it can leak small clots....which you do not want. That is why the EP will require a TEE at the six month mark to see if there is any evidence of a leak. If you don't leak, and if other comorbidities don't still require you to be on warfarin or a DOAC, you can go off apixaban or off rivaroxaban.