Hospital readmission for acute kidney injury is independently associated with de novo end-stage renal disease after liver transplantation.

Abstract

End-stage renal disease (ESRD) after liver transplantation (LT) is associated with high morbidity and mortality. The consequences of hospitalizations for post-LT acute kidney injury (AKI) are poorly understood. Using linked Medicare claims and transplant registry data, we analyzed adult liver alone recipients not receiving pre-transplant dialysis between 1/1/2007-12/31/2016. Covariate-adjusted Cox proportional hazards models stratified by center evaluated factors associated with AKI readmission during the first post-LT year, and whether AKI readmission was associated with de novo early (<1y) or late (≥1y) ESRD post-LT. The cohort included 10,559 patients and was 64.5% male, 72.5% White, 8.1% Black and 14.0% Hispanic with median age 62 years. Overall, 2,875 (27.2%) patients had ≥1 AKI hospitalization during the first year. eGFR at LT was associated with AKI readmission (aHR 1.16 per 10mL/min/1.73m2 decrease; p<0.001). The aHR for early ESRD in patients with ≥1 AKI readmission <90 days post-LT was 1.90 (p<0.001). The aHRs for late ESRD with 1 and ≥2 prior AKI readmissions were 1.57 and 2.80 respectively (p<0.001). AKI readmissions in the first post-LT year impact over one-quarter of recipients. These increase the risk of subsequent ESRD, but may represent an opportunity to intervene and mitigate further renal dysfunction.