Risk Stratification for Chronic Kidney Disease After Liver Transplant for Metabolic Dysfunction-associated...

Chronic kidney disease (CKD) is a well-recognized complication in patients undergoing liver transplantation (LT), particularly those with metabolic dysfunction-associated steatohepatitis (MASH), a leading cause of cirrhosis in the modern era. This study sought to refine risk stratification for CKD events post-LT in cirrhosis patients with MASH by leveraging baseline renal function at transplant.

A total of 717 MASH cirrhosis patients who had LT (1997-2017) at 7 US centers (NailMASH Consortium) were analyzed. Patients were categorized by estimated glomerular filtration rate (eGFR) at transplant: low (LGFR, eGFR ≤30 mL/min/1.73 m²), medium (MGFR, eGFR >30-≤60 mL/min/1.73 m²), and high (HGFR, eGFR >60 mL/min/1.73 m²). Time-related eGFR intercepts, slopes, and assessments of advanced-stage CKD (aCKD) events, defined as 2 eGFR levels <30 mL/min/1.73 m² separated by ≥90 d, were examined.

Post-LT, LGFR group showed increased eGFR, whereas the HGFR group experienced a decline. The 3-mo mark was identified as a "reset point," signifying a new reference level, beyond which a different rate of decline was observed. After 3 mo, mean eGFRs of the LGFR group approached MGFRs, whereas the mean eGFR of the HGFR group continued to decrease but remained higher than other groups during a 60-mo follow-up. LGFR patients had significantly higher aCKD probability than MGFR and HGFR groups. Subanalysis at 3 mo post-LT revealed more aCKD events in the LGFR group compared with MGFR and HGFR groups ( P  < 0.0001).

The study underscores renal impact of LT in MASH cirrhosis, indicating unique eGFR trajectories post-LT tied to baseline eGFR, with a reset point at 3 mo. Monitoring post-LT renal function, especially in those at aCKD risk, is crucial. Renal-sparing immunosuppression may help, regardless of baseline eGFR. Further studies are needed for interventions addressing renal dysfunction of patients with MASH post-LT.