Total Antioxidant Capacity and Prediabetes Are Associated with Left Ventricular Geometry in Heart-Failure Patients with Reduced Ejection Fraction: A Cross-Sectional Study

Introduction: Few studies explored the association between total antioxidant capacity (TAC) and left ventricular (LV) geometry in patients with heart failure and reduced ejection fraction (HFrEF). The current study aimed to assess factors associated with LV geometry in HFrEF patients with particular emphasis on oxidative stress and glycemic status.Methods: A cross-sectional study was conducted from July 2021 to September 2022. All consecutive patients with HFrEF who were stabilized on optimal or maximally tolerated heart failure medications were recruited. Patients were classified into tertiles based on TAC and malondialdehyde for correlation with other parameters.Results: TAC was significantly associated with LV geometry (P = 0.01), with higher TAC levels observed in patients with normal LV geometry (0.95 +/- 0.08) and concentric hypertrophy (1.01 +/- 0.14) than in patients with eccentric hypertrophy (EH) (0.90 +/- 0.10). There was a significant positive trend in the association between glycemic state and LV geometry (P = 0.002). TAC showed a statistically significant positive correlation with EF (r = 0.29, P = 0.0064) and a negative correlation with LV internal diameter at end diastole (r = -0.26, P = 0.014), LV mass index (r = -0.25, P = 0.016), and LV mass (r = -0.27, P = 0.009). After adjusting for multiple confounders, prediabetes [odds ratio (OR) = 4.19, P = 0.032] and diabetes (OR = 7.47, P = 0.008) were associated with higher odds of EH than normoglycemic patients. A significant inverse trend was also observed in the association between TAC tertile and the odds of LV geometry (OR = 0.51, P = 0.046).Conclusions: TAC and prediabetes are significantly associated with LV geometry. TAC can be used as an additional marker in HFrEF patients to reflect the severity of the disease. Interventions aimed at managing oxidative stress might be useful in HFrEF patients to reduce oxidative stress and improve LV geometry and quality of life.