Biological Mother-To-Child Living Donor Liver Transplantation: Early Vs. Late Postpartum Donation.

INTRODUCTION: Biological parental donations provide the best option for many pediatric recipients, yielding unique immunological benefits that may enable minimization of immunosuppression in transplanted children. However, living related maternal donation in the postpartum period may introduce an increased risk of donor complications due to the physiological changes of pregnancy and childbirth, and the optimal timing of postpartum living donation is unknown. METHODS: Using US national registry data, we characterized donor and recipient outcomes for pediatric living donor liver transplants performed between 2004 and 2022 where a biological mother donated to a child ≤ 24 months old. RESULTS: Our study population included 256 donor-recipient pairs, with biliary atresia representing the most common indication for transplantation (68.0%). Donors had a median [IQR] age of 30 [25, 34] years, and the median [IQR] time from birth to donation was 9.0 [6.8, 13.0] months. 6.3% of donors experienced a biliary or other complication. When stratifying by donors who donated ≤ 6 vs. > 6 months postpartum, we found no significant differences in donor complications or readmission. Stratified analyses were also comparable for recipient mortality, graft survival, and rejection-free survival. Donors ≤ 6 months postpartum (n = 64) were more likely to experience reoperation than mothers who donated > 6 months postpartum (n = 192) (6.2% vs. 1.0%, p = 0.04). CONCLUSIONS: While maternal living donor liver transplantation is safe for most donors, there is a higher risk of reoperation when donation is performed ≤ 6 months postpartum. Surgeons should be aware that these donors are a higher risk population, requiring discussion upon consent and warranting close post-operative monitoring.