[The impact of frailty on the prognosis of chronic heart failure patients treated with cardiac resynchronization therapy defibrillator implantation].

<b>Objective:</b> The aim of this study was to assess the frailty status of patients with heart failure undergoing CRT-D and then explore the predictive value of frailty for all-cause mortality and heart failure-related readmissions in these patients. <b>Methods:</b> We retrospectively included 374 patients with chronic heart failure who underwent CRT-D treatment at the First Affiliated Hospital of Xinjiang Medical University between June 2020 and June 2024. Based on the Tilburg Debilitation Assessment Scale, 175 patients (46.8%) were classified as frail while 199 (53.2%) were classified as non-frail. The baseline data between the two groups was compared using Cox regression analysis and Kaplan-Meier curves were used for survival analysis. <i>P</i>-values of <0.05 indicated statistically significant differences. <b>Results:</b> A total of 374 patients aged 25-93 (68±11) years were enrolled in this study, 101 (27.0%) of which were female. Among these, 175 (46.8%) were categorized as frail, and 199 (53.2%) were classified as non-frail. Over a median follow-up time of 23 (5, 45) months, 35 (9.4%) patients experienced all-cause mortality, with 30 (17.1%) deaths occurring in the frail group and 5 (2.5%) in the non-frail group; meanwhile, readmission events due to heart failure occurred in a total of 174 (46.5%) patients, including 122 (70.1%) in the frail group, and 52 (29.9%) in the non-frail group. Cox analysis showed that frailty was a significant determinant of all-cause mortality (<i>HR</i>=21.25, 95%<i>CI</i> 3.99-113.30, <i>P</i><0.001) and readmission among heart failure patients receiving CRT-D (<i>HR</i>=2.52, 95%<i>CI</i> 1.73-3.68, <i>P</i><0.001). Log-rank tests showed that the survival rate of patients in the frail group was significantly lower than that of patients in the non-frail group (<i>HR</i>=7.22, 95%<i>CI</i> 2.80-18.60, <i>P</i><0.001) and the risk of readmission events due to heart failure was significantly higher among patients in the frail group than among those in the non-frail group (<i>HR</i>=2.75, 95%<i>CI</i> 1.98-3.81, <i>P</i><0.001). <b>Conclusions:</b> Frailty is an independent predictor of postoperative all-cause mortality and the occurrence of heart failure-related readmissions in patients with heart failure treated receiving CRT-D.