Prognostic value of albumin-bilirubin score in patients with chronic heart failure

Abstract Background Liver dysfunction is one of the common comorbidities, and associated with worse clinical outcomes in patients with chronic heart failure (CHF). Recently, the albumin-bilirubin (ALBI) score has been developed as an effective and convenient scoring system for assessing liver function. However, the prognostic significance of the ALBI score in patients with CHF remained to be clarified. Purpose We sought to investigate the clinical significance of ALBI score on outcome prediction in patients with CHF. Methods We prospectively examined 1567 symptomatic CHF patients (median age 74, inter quartile range [IQR] 64-82 years, mean left ventricular ejection fraction [LVEF] 49 ± 15.9 %, median N-terminal pro-brain natriuretic peptide [NT-pro BNP] 801 [IQR 372-1820] pg/ml) in a multicentre registry with 27 Japanese sites between January 2020 and December 2023. The ALBI score was calculated according to the following formula: log10 total bilirubin (mg/dl) × 0.06 + albumin (g/dL) × 10 × (-0.085). Studied patients were divided into three groups according to the ALBI grade; ALBI score ≤ -2.60 (Grade1, n = 691), -2.60 < ALBI score ≤ -1.39 (Grade 2, n = 864), ALBI score > -1.39 (Grade3, n = 12). Primary outcome of interest was a composite of all-cause death and hospitalisation due to worsening heart failure. Results Patient with higher ALBI grade had higher age, New York Heart Association functional class, NT-pro BNP level, prevalence of atrial fibrillation and chronic obstructive pulmonary disease, and lower body mass index, systolic blood pressure, haemoglobin level, serum albumin level and estimated glomerular filtration rate compared to those with lower ALBI grade. LVEF was comparable between the groups. During a median follow-up period of 537 (IQR 285-701) days, the primary outcome occurred in 267 patients (17%). Higher ALBI grade were significantly related to increased incidence of the primary outcome (P for trend < 0.001) (Figure 1). Multivariable Cox regressions showed that a higher ALBI score was independently associated with higher risk of the primary outcome (hazard ratio 2.8, 95% confidential interval (CI) 2.08-3.77, P < 0.001), even after adjustment for the MAGGIC score as an established risk prediction model, NT-pro BNP, aspartate aminotransferase, and platelet counts. Furthermore, addition of the ALBI score to the MAGGIC score significantly increased c-index from 0.70 (95% CI 0.66-0.74) to 0.73 (95% CI 0.69-0.76) (P < 0.001) (Figure 2). The net reclassification improvement afforded by the ALBI score was 26% for the primary outcome (P<0.001). Conclusions Liver dysfunction assessed by the ALBI score was independently associated with worse clinical outcomes in patients with CHF. Moreover, addition of the score to the existing risk prediction model significantly increased the ability of outcome prediction, suggesting beneficial clinical application of the ALBI score in patients with CHF.