Abstract Aims The Model for End‐stage Liver Disease eXcluding International normalized ratio (MELD‐XI) is an established scoring system that reflects hepatorenal function. However, little is known about the prognostic value of changes in MELD‐XI score during hospitalization in acute decompensated heart failure (ADHF). Methods and results We prospectively analysed 536 patients admitted for ADHF between January 2018 and December 2019. In the MELD‐XI, 9.44 is the lowest possible score and considered to be normal, and values above 9.44 are classified as high. We calculated MELD‐XI scores at admission and discharge and used them to divide patients into four groups depending on whether the score was high (>9.44) or normal (9.44) at each time point as follows: normal score at both measurements (persistently normal group, n = 99), high score at admission and normal score at discharge (high‐to‐normal group, n = 108), normal score at admission and high score at discharge (normal‐to‐high group, n = 24), and high score at both measurements (persistently high group, n = 305). The persistently high group had higher blood urea nitrogen, creatinine, and N‐terminal pro‐brain natriuretic peptide levels at both admission and discharge and significantly higher left ventricular end‐diastolic, left atrial, right ventricular end‐diastolic, and maximal inferior vena cava diameters at discharge. During the median follow‐up period of 369 days (Q1, Q3: 97, 576), 231 (43.1%) patients reached the primary endpoint (a composite of all‐cause death or re‐hospitalization for heart failure). The Kaplan–Meier analysis revealed a significantly higher composite event rate in the persistently high group than in the persistently normal and high‐to‐normal groups (log‐rank test, P
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