I am currently researching vagal AF and gut-heart influences on AF for my own purposes. I have found the most incredible paper (a Comment letter in fact) on vagal AF by Prof Phillipe Coumel (reference courtesy a-fib.com). The reference is PubMed PMID 11863343 and the full text is at academic.oup.com/eurheartj/... (pdf available).
It is (as per usual with Prof Coumel) a masterpiece of medical knowledge, logic and good use of english. It's a slightly tough read unless you're up with medical terminology, but nonetheless worth working through for that. I have highlighted on my copy what I consider to be the most important remarks of his relevant to my research. Almost the whole letter is yellow!
I simply cannot understand why the field of cardiology does not take more active notice of neurogenic AF - vagal or otherwise. I feel that if Coumel's work was better known about, those of us suffering vagal AF would suffer less.