The high incidence and associated complications are causing atrial fibrilla
tion to emerge as a disease of uncertain prognosis, rather than an acceptab
le alternative to sinus rhythm. There is accumulated evidence of an electri
cal and anatomical remodelling in atrial fibrillation that facilitates the
onset and maintenance of this arrhythmia, and the capacity for these change
s may be reversed if sinus rhythm is restored. The development of new drugs
that decrease the incidence of recurrences and the advent of internal card
ioversion, which has proven to be very effective when traditional methods h
ave failed, have widened the indications and increased the number of patien
ts who may benefit from this technique, These advances pave the way for the
development of an implantable atrial cardioversor, which would allow an ea
rly treatment of atrial fibrillation and, therefore, lessen the deleterious
effects brought on by this rhythm disorder.