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Left ventricular remodeling in end-stage liver disease and post-transplant mortality assessed using end-diastolic pressure-volume relation analysis: observational retrospective study.

BACKGROUND: Diastolic dysfunction is regarded as an important predictor of outcome after liver transplantation (LT). We investigated the influence of liver disease severity on left ventricular diastolic properties using end-diastolic pressure-volume relationship (EDPVR) analysis in patients with end-stage liver disease (ESLD). Association between alterations of the EDPVR and mortality after LT was evaluated.

METHODS: In this observational retrospective cohort study, 3211 patients who underwent LT for ESLD were included in analysis. Variables derived from single-beat EDPVR (diastolic stiffness-coefficient [β] and end-diastolic volume at an end-diastolic pressure of 20 mmHg [EDVI20 ] indicating ventricular capacitance) were estimated using preoperative echocardiographic data. Alterations in EDPVR with increased stiffness (β >6.16) were categorized into 3 groups; leftward-shifted (EDVI20 <51 mL/m2 ), rightward-shifted (EDVI20 >69.7 mL/m2 ), and intermediate (EDVI20 51-69.7 mL/m2 ).

RESULTS: As the model for ESLD score increases, both EDVI20 and β gradually increased, which indicated ventricular remodeling with larger capacitance and higher diastolic stiffness. Among patients with increased stiffness (β >6.16, n=1090), survival rates after LT were lower in leftward-shifted EDPVR than in rightward-shifted EDPVR (73.7% vs 82.9%; log-rank P=0.002). In the adjusted Cox proportional hazard model, risk of cumulative all-cause mortality at 11 years was the highest in leftward-shifted EDPVR (hazard ratio [HR]: 1.93; 95% confidence interval [CI]: 1.27-2.92), followed by intermediate EDPVR (HR: 1.55; 95% CI: 1.12-2.26), compared with rightward-shifted EDPVR. The SHapley Additive exPlanation model revealed that the variables associated with leftward-shifted EDPVR were diabetes, female sex, old age, and hypertension.

CONCLUSIONS: As ESLD advances, diastolic ventricular properties are characterized by increased EDVI20 and β on rightward-shifted EDPVR, indicating larger capacitance and higher stiffness. However, leftward-shifted EDPVR with left ventricle remodeling failure is associated with poor post-LT survival.

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