Abstract
Objective: This study aimed to identify key prognostic factors in patients with hypertrophic cardiomyopathy (HCM) presenting heart failure with preserved ejection fraction (HFpEF), with a special focus on the role of Free Triiodothyronine (FT3) levels. Methods: A retrospective cohort study was conducted, comprising HFpEF patients admitted to two medical centers from 2009 to 2019. Data collection included demographic and clinical parameters, particularly FT3 levels. Univariate and multivariate Cox analyses, Kaplan-Meier (KM) survival curve analysis, and Restricted Cubic Spline (RCS) curve analysis were employed to identify prognostic factors and to assess the non-linear predictive value of FT3. Results: The analysis revealed that age, atrial fibrillation, and NT-proBNP levels significantly influenced prognosis in heart failure patients. Additionally, FT3 levels emerged as a significant independent predictor of both all-cause mortality and cardiac transplantation. Patients with lower FT3 levels exhibited poorer long-term prognoses, with 2.885 identified as the critical FT3 value. Conclusions: These findings underscore the importance of FT3 levels as a crucial prognostic factor in patients with heart failure, warranting consideration in patient outcomes assessments. Clinicians are recommended to monitor FT3 levels and contemplate interventions aimed at maintaining or enhancing thyroid function in these patients to improve outcomes.
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