4.1 Limitations
There are several limitations in our study. The main limitation of the
present study was its retrospective observational protocol. Second, the
surgeons were not constant through the series, and third, the AA events
were confirmed only when objectively documented. The occurrence of
asymptomatic transient AF might not be detected, and the incidence of AA
might be underestimated. Finally, the sample size was relatively small,
and the statistical power of the analyses was not strong. Further
studies are needed to definitively determine if the small aorto-mitral
angle leads to the AA events.