  Atrial fibrillation (AF) consequences on the heart valve dynamics are usually
studied along with a valvular disfunction or disease, since in medical
monitoring the two pathologies are often concomitant. Aim of the present work
is to study, through a stochastic lumped-parameter approach, the basic fluid
dynamics variations of heart valves, when only paroxysmal AF is present with
respect to the normal sinus rhythm (NSR) in absence of any valvular pathology.
Among the most common parameters interpreting the valvular function, the most
useful turns out to be the regurgitant volume. During AF both atrial valves do
not seem to worsen their performance, while the ventricular efficiency is
remarkably reduced.
