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.