Evaluating Graft Loss Risk in Living-Donor Kidney Transplants with Multiple Renal Arteries.

BACKGROUND Despite its surgical complexity, kidney transplantation (KT) with multiple renal arteries (MRA) is comparable in performance to KT with a single renal artery (SRA). This study aimed to evaluate the effect of MRA and to investigate risk factors for graft loss in living-donor KT with MRA. MATERIAL AND METHODS This study included living-donor KT recipients who underwent KT in our hospital from February 2002 to March 2023. The primary outcome was whether MRA decreased the prognosis of transplanted kidneys. The secondary outcomes were the risk factors for graft loss in KT with MRA, such as recipients' characteristic. RESULTS Out of 197 recipients, 47 (23.8%) received kidneys with MRA. In inverse probability of treatment weighting, the risk of graft loss did not increase in KT with MRA, as compared to that in KT with SRA (hazard ratio [HR]: 1.46; 95% confidence interval [CI]: 0.68-3.14). MRA were associated with graft loss in ABO blood-incompatible KT (HR: 5.09, 95% CI: 1.75-14.7). CONCLUSIONS In ABO blood-incompatible KT, MRA can increase risk of graft loss.