Effect of LSD on Renal Function in Cirrhotic Patients With Portal Hypertension

Liver cirrhosis is associated with systemic hemodynamic disturbances, reduced effective circulating volume, and renal hypoperfusion, creating a high risk of renal dysfunction and hepatorenal syndrome (HRS)-a life-threatening condition reflecting the critical hepatorenal interaction. Patients with cirrhosis and portal hypertension frequently have subclinical or overt renal impairment preoperatively. Laparoscopy splenectomy and azygoportal disconnection (LSD) is a standard intervention for cirrhotic patients with portal hypertension, but its impact on long-term renal function recovery remains unclear.

This single-center retrospective cohort study will be conducted at the Department of Hepatobiliary Surgery, Subei People's Hospital Affiliated to Yangzhou University, Yangzhou, China. We will retrospectively collect clinical and follow-up data from patients with liver cirrhosis and portal hypertension who underwent LSD between February 2012 and February 2025.

Patients will be stratified into two groups based on preoperative estimated glomerular filtration rate (eGFR): impaired renal function group (<90 mL/min/1.73m²) and normal renal function group (≥90 mL/min/1.73m²). Kidney function will be assessed using eGFR calculated with the 2021 CKD-EPI creatinine equation at five time points: preoperative baseline and postoperative months 3, 6, 9, and 12.

Statistical analyses will include linear mixed-effects models (LMM) to evaluate eGFR change trajectories and group differences over time; multivariable linear regression to identify factors independently associated with eGFR change (ΔeGFR = postoperative month 12 eGFR - preoperative eGFR); and multivariable logistic regression (limited to patients with baseline eGFR <90 mL/min/1.73m²) to identify predictors of renal function recovery to normal (eGFR ≥90 mL/min/1.73m²).

The study aims to evaluate whether LSD is associated with kidney function improvement in patients with liver cirrhosis and portal hypertension, whether the degree of improvement differs between patients with and without pre-existing renal impairment, and whether preoperative factors such as ascites severity are associated with the magnitude of renal function recovery. These findings may help fill an important gap in understanding the hepatorenal axis after LSD and guide perioperative renal protection strategies in this high-risk population.