Sex-Specific Prognostic Utility of the Sarcopenia Index in All-Cause Mortality Risk for Patients with Heart Failure

Ming Li ^1,2 Yanying Liang ² Baozhen Wu ² Ziliang Zhu ² Meifang Wang ² Jianying Chen ² Can Chen ^1,2*

• ¹ Jinan University, Guangzhou, Guangdong Province, China
• ² Affiliated hospital of guangdong medical university, zhanjiang city, China

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)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.