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Acute kidney injury (AKI) represents a critical complication in the context of liver transplantation, contributing significantly to post-operative morbidity and mortality. Liver transplantation (LTx), as a life-saving procedure for end-stage liver disease, often involves complex hemodynamic and metabolic changes that can predispose patients to AKI. We present the prevalence of AKI, risk factors, and outcomes associated with liver transplant recipients in 192 patients who were transplanted from June 2019 To July 2023 in Firoozgar Hospital.
The study group was 192 liver transplant recepients , 120 male (62.5%) and 72 female (37.5%) with a mean age 44.5± range 7-75 Years. AKI was defined as any change in serum creatinine 0.3 mg/dL in < 48 h for 5 days after LTx. eGFR was calculated based on CKD-Epi 2021 with the mean range of 94.9±34.3 cc/min. We evaluated demographic data and any history of diabetes, hypertension, chronic kidney disease, nephrotoxic drugs, massive bleeding, need to receive vasopressor drug, liver failure etiology, respiratory assistance, sepsis, any indication for readmission in the operating room, MELD score and liver function after LTx as the risk factors of AKI. The outcome was defined as death in one month after LTx. Data was analyzed with the Spss program version 24.
AKI happened in 105 (54.7%) patients and the mortality rate was 19.3% (37). LTx mortality was correlated with female gender, AKI, patient’s age, bleeding volume, MELD(Model for End -Stage Liver Disease) score, and admission duration (P<0.05). The risk factors for AKI in the univariate analysis were massive bleeding and need for blood transfusion, receiving vasopressors, readmission in the operating room, duration on ventilatory support, baseline eGFR, and impaired liver function tests (P<0.05). Multivariate analysis proved that the baseline eGFR, duration on ventilatory support, need for vasopressors and bleeding volume were the main risk factors for AKI after LTx in this study (P<0.05).
This study supports that the main risk factors for AKI after LTx are hemodynamic factors. A deeper understanding of the complex interplay between liver transplantation and kidney injury improves our outcomes in this high-risk population.