Objectives: In this study we observed that the effect of post-Norwood 3.5 mm modified BTS(mBTS and 5 mm right ventricle to pulmonary (Sano modification) shunt models on clinical outcomes. Patients and Methods: 54 patients who were operated in our hospital between 2011and 2020 years, were included in our study and this is a retrospective, observational, single-center case series study. Results: The effect of shunt type on mortality was statistically significant, and the rate of death was lower in patients who used SANO type shunts. (p <0.05) The effect of VISC score on early mortality was significant, and VISC score was higher in the group with exitus. (p <0.05). Conclusion: Although Sano shunt seems more preferred in Norwood, the experience of the surgeon and the center's experience may have led to variation in results at HLHS. Nevertheless, it will be clinically important for studies to evaluate the long-term results between the two shunt types.