Renal Implications of Left Renal Vein Ligation for Portal Flow Augmentation in Liver Transplantation.

BACKGROUND: Spontaneous lienorenal shunts (SLS) siphon blood away from the portal circulation and may compromise portal inflow in liver transplantation (LT). Performing a left renal vein ligation (LRVL) is a relatively easy and efficacious method of overcoming this portal 'steal'. However, given the delicate state of renal function in these patients, its short and long term effects remain undefined. The aim of this study was to evaluate the efficacy of LRVL in augmenting portal flow and safety with regards to renal function. METHODS: A prospectively collected database of 1638 consecutive LT recipients between January 2010 and August 2020 was reviewed. Twenty-eight patients who underwent LRVL were identified. There were six paediatric recipients, who were analysed separately. Data with regards to imaging, renal function, intraoperative portal hemodynamics, and renal morbidity were analysed. RESULTS: Of the 22 adults, 21 underwent live donor LT. 22.5% had a pre-transplant history of acute kidney injury (AKI). Pre-operative CT demonstrated portal vein thrombosis and SLS in 63.6% and 92.9% of patients respectively. LRVL resulted in a significant augmentation of portal hemodynamics in both the adult and paediatric recipients. Postoperatively, 14.3% and 35.7% of patients developed chylous drain output and AKI respectively. Of 13 patients who underwent CT at various timeframes, 5 patients had a partial re-canalisation of LRV at 6 months. CONCLUSION: From renal and portal standpoints, LRVL is a safe and effective technique of augmenting portal inflow. Further large-scale multicentre studies and consensus will help define an objective algorithmic approach to LT recipients with SLS.