As there is a higher rate of survival after congenital heart surgery, there is a growing concern about quality of life. Neurological dysfunction is a significant problem after congenital heart surgery that may affect quality of life. Also due to better surgical outcome andhigher survival rate, the focus is increasingly on the late neurodevelopmental and behavioral problems associated with pediatric cardiac surgery.Objective: Bidirectional Glenn shunt is a well-established procedure performed as a part of the single ventricle palliation pathway. Whether the bidirectional Glenn shunt is better performed without the support of cardiopulmonary bypass, is still a matter of debate. In this study, we report and Compare early post operative neurological outcome after on pump and off pump Bidirectional Glenn shunt with temporary cavo-atrial shunt.Methods: between July 2012 and Feb. 2014, 50 Patients indicated for Glenn shunt were divided into two groups. Group I (25 patients) where It was done with cardiopulmonary, and Group II (25 patients) where it was done without cardiopulmonary Bypass and with Cavo-atrial shunt. In our study, the Mean ± SD age of the patients was (36.26 ± 19.149 Month), in the range of 15 months and 86 month. Preoperative evaluation to select patients according to exclusion and inclusion criteria, documenting different variables. Intraoperative and postoperative monitoring documenting different variables of CVP, O2 Sat.,Operative time, shunt time, bypass time, HCT, S. Creat., Also neurological evaluation using Modified Glasgow Coma Scale for Infants and Children.Results: There was insignificant difference between both groups regarding preoperative variables and postoperative neurological outcome.Conclusion: Bidirectional Glenn Shunt may be done on pump or off-pump with cavo-atrial temporary shunt with insignificant difference in the early postoperative neurological outcome, but we report that late complications and neurodevelopmental abnormalities should be traced in other long-term studies. we also want to focus on better techniques of intraoperative monitoring, As Near-infrared spectrography, transcranial Doppler, should be adopted as standard of care, as it was not available during our study.