Why the study?
The sex-specific prognostic utility of the sarcopenia index in heart failure remains poorly understood.
Does the sarcopenia index predict all-cause mortality in patients with heart failure, and does this prognostic utility differ by sex?
Does the sarcopenia index predict all-cause mortality in patients with heart failure, and does this prognostic utility differ by sex?
The sarcopenia index is a robust, sex-specific predictor of all-cause mortality in heart failure, offering significant prognostic value and improving risk stratification in males, but not in females.
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SI may aid male HF risk stratification but not females and should not yet change practice; leaves open prospective sex-specific validation.
Background The sarcopenia index (SI), derived from serum creatinine and cystatin C levels, has emerged as a novel and accessible biomarker for predicting clinical outcomes. However, its sex-specific prognostic utility in heart failure (HF) remains poorly understood. This study aimed to investigate the association between SI and all-cause mortality in HF, with a focus on sex-specific differences. Methods A retrospective cohort of 753 patients (median age: 69 years; 61% male) diagnosed with HF from a tertiary hospital in China was analyzed. Cox regression models and Kaplan–Meier survival analyses were utilized to evaluate the relationship between SI and all-cause mortality. Stratified analyses based on sex were performed, and the incremental predictive value of SI was assessed by integrating it into traditional risk models. Results Over a median follow-up of 537 days, 143 deaths occurred. In adjusted models, a lower SI was significantly associated with an increased risk of all-cause mortality in male patients (hazard ratio: 0.98 per unit increase, 95% confidence interval: 0.97–0.99, p = 0.002). Males in the lowest SI tertile had a 1.66-fold higher mortality risk than those in the highest tertile ( p = 0.004). Kaplan–Meier survival analysis further confirmed these findings, demonstrating significantly lower survival probabilities for males in the lowest SI tertile than for those in higher tertiles (Log-rank p = 0.0013). No such association was observed in females. Adding SI to risk models improved prognostic accuracy in males, enhancing the C-statistic from 0.749 to 0.764 and significantly improving net reclassification and discrimination indices ( p < 0.05). Conclusion The SI serves as a robust sex-specific predictor of all-cause mortality in HF, demonstrating significant prognostic value in males but limited utility in females. These findings highlight the potential of SI as a cost-effective addition to existing risk stratification models for male patients with HF.
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Li et al. (2025) studied this question.
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