“…Temur et al compared the results of ToF treatment with three methods: glutaraldehyde-treated autologous pericardial patch as monocusp, Nunn's bileaflet pulmonary valve reconstruction technique with pericardial patch and Nunn's bileaflet technique with expanded polytetrafluoroethylene membrane, however, with a small number of patients in particular groups. 22 Freedom from moderate to severe pulmonary insufficiency reported in this study were 73.3%, 100%, and 89.4% in particular groups, respectively; however, it decreased to 40%, 81.2%, and 73.7%, respectively, at the end of the follow-up period with a mean follow-up of 17.5 ± 13.0 months. Also, Kumar et al reported that in a group of 171 patients (25 were lost to follow-up) 42 have required replacement of their monocusp valves 10.1 ± 5.0 years after original monocusp insertion.…”