Background: Chronic kidney disease (CKD) frequency is increasing in patients with cirrhosis and these individuals often experience acute kidney injury (AKI). Direct comparisons of outcomes between AKI-only vs. AKI on CKD (AoCKD) among patients with cirrhosis are not well described.
Methods: 2,057 patients with cirrhosis and AKI across 11 hospital networks from the HRS-HARMONY consortium were analyzed (70% AKI-only and 30% AoCKD). The primary outcome was unadjusted and adjusted 90-day mortality, with transplant as a competing risk, using Fine and Gray analysis.
Results: Compared to patients with AKI-only, patients with AoCKD had higher median admission creatinine (2.25 [IQR 1.7, 3.2] vs. 1.83 [1.38, 2.58] mg/dL) and peak creatinine (2.79 [2.12, 4] vs. 2.42 [1.85, 3.50] mg/dL) but better liver function parameters (total bilirubin 1.5 [IQR 0.7, 3.1] vs. 3.4 [1.5, 9.3] mg/dL; and INR 1.4 [IQR 1.2, 1.8] vs. 1.7 [1.39, 2.2]; p<0.001 for all). Patients with AoCKD were more likely to have metabolic dysfunction associated steatotic liver disease (MASLD) cirrhosis (31% vs. 17%) and less likely to have alcohol-associated liver disease (26% vs. 45%; p<0.001 for both). Patients with AKI-only had higher unadjusted mortality (39% vs. 30%), rate of intensive care unit admission (52% vs. 35%; p<0.001 for both), and use of renal replacement therapy (20% vs. 15%; p=0.005). After adjusting for age, race, sex, transplant listing status, and MELD-Na score, AoCKD was associated with a lower 90-day mortality compared to AKI-only (sub-HR 0.72 [95% CI 0.61, 0.87]).
Conclusion: In hospitalized patients with AKI and cirrhosis, AoCKD was associated with lower 90-day mortality compared to AKI-only. This may be due to the impact of worse liver function parameters in the AKI-only group on short-term outcomes. Further study of the complicated interplay between acute and chronic kidney disease in cirrhosis is needed.
Keywords: acute on chronic kidney disease; liver failure; liver transplant; renal failure.
Copyright © 2024. Published by Elsevier Inc.