Vitamin D insufficiency and cardiovascular involvement in systemic sclerosis: Association with echocardiographic parameters and risk factors.

Background: Vitamin D plays several roles beyond bone metabolism, potentially protecting the cardiovascular system. Systemic sclerosis (SSc) is an autoimmune disease characterized by fibrosis and vascular dysfunction, carrying a high cardiovascular risk. However, the relationship between vitamin D insufficiency and cardiovascular involvement in SSc patients remains unclear. This study aims to assess the association between low vitamin D levels, echocardiographic parameters indicative of ventricular dysfunction, and cardiovascular risk factors in SSc patients. Methods: A retrospective observational study involved 160 SSc patients undergoing echocardiography and serum 25-hydroxyvitamin D measurement. Patients were categorized into two groups: vitamin D insufficiency (<30 ng/mL) and normal levels (≥30 ng/mL). Echocardiographic parameters and cardiovascular risk factors were evaluated. Results: Vitamin D insufficiency was detected in 68.9 % of patients. Patients with insufficient vitamin D had higher systolic pulmonary arterial pressure (PAPs; 37.68 ± 7.56 mmHg vs. 33.12 ± 6.17 mmHg; p = 0.004), reduced TAPSE/PAPs ratio (0.65 ± 0.13 vs. 0.72 ± 0.14; p = 0.021), increased interventricular septal thickness (8.17 ± 1.28 mm vs. 7.69 ± 1.18 mm; p = 0.028), and greater left ventricular end-diastolic diameter (44.06 ± 4.28 mm vs. 42.67 ± 3.44 mm; p = 0.037), indicating ventricular dysfunction. Vitamin D insufficiency significantly correlated with hypertension (OR = 2.31; p = 0.032), dyslipidemia (OR = 2.45; p = 0.015), and overweight/obesity (OR = 4.73; p = 0.002), but not with diabetes or smoking. Conclusions: Vitamin D insufficiency may contribute to cardiovascular dysfunction in SSc patients. Monitoring vitamin D levels might improve cardiovascular risk stratification. Further studies are necessary to determine if supplementation could enhance cardiac outcomes.