Sex-Specific Association Between Iron Status and the Predicted 10-Year Risk for Atherosclerotic Cardiovascular
Juan Zhou1,2, Rui Zhao2, Dongxia Wang2
1Shenzhen Nanshan Center for Chronic Disease Control, Shenzhen, 518051, China.
Insights
Serum ferritin (SF) and hemoglobin (Hb) levels show sex-specific associations with atherosclerotic cardiovascular disease (ASCVD) risk in hypertensive patients. Men exhibit a U-shaped risk, while women show a positive linear relationship with higher iron status markers.
Area of Science:
- Cardiovascular Medicine
- Clinical Biochemistry
- Hypertension Research
Background:
- Serum ferritin (SF) and hemoglobin (Hb) are key indicators of iron status, widely used in clinical practice.
- Existing research on the association between SF, Hb, and atherosclerotic cardiovascular disease (ASCVD) risk has produced conflicting results, with some studies suggesting sex-specific effects.
- Hypertensive patients frequently exhibit abnormal iron status, yet specific research on this population remains limited.
Purpose of the Study:
- To investigate the sex-specific relationships between serum ferritin (SF) and hemoglobin (Hb) levels and the predicted 10-year ASCVD risk among individuals with hypertension.
- To explore potential differences in these associations between hypertensive men and women.
Main Methods:
- A cross-sectional study involving 718 hypertensive men and 708 hypertensive women.
- The 10-year ASCVD risk was calculated using the China-PAR equation.
- Dose-response relationships were analyzed using linear and quadratic models, with adjustments for potential confounding factors.
Main Results:
- In hypertensive men, both SF and Hb demonstrated a U-shaped association with ASCVD risk.
- In hypertensive women, a positive linear relationship was observed: higher log-transformed SF and Hb levels were significantly associated with increased ASCVD risk scores.
- A significant interaction between iron status and inflammation was noted concerning ASCVD risk in hypertensive women.
Conclusions:
- The association between iron status markers (SF and Hb) and ASCVD risk in hypertensive patients is sex-dependent.
- Hypertensive men display a U-shaped risk curve related to iron status, whereas hypertensive women show a positive linear association.
- These findings highlight the importance of considering sex and iron status in the cardiovascular risk assessment of hypertensive individuals.
Abstract:
Serum ferritin (SF) and haemoglobin (Hb) are widely used in clinical practice to assess iron status. Studies exploring the relationship of SF and Hb with atherosclerotic cardiovascular disease (ASCVD) risk have yielded conflicting results, and some indicated sex specificity. Hypertensive patients have abnormal iron status. However, research on patients with hypertension is limited. We aim to investigate the sex-specific links of SF and Hb with the predicted 10-year ASCVD risk in hypertensive patients. This cross-sectional study included 718 hypertensive men and 708 hypertensive women. The predicted 10-year ASCVD risk was calculated based on the China-PAR equation. The dose-response curves were illustrated by fitting linear and quadratic models. In hypertensive men, the iron status fits for a quadratic model for ASCVD risk, showing a U-shape. After adjusting for potential confounding factors, the regression coefficients and 95% confidence intervals (95% CI) across tertile of SF were 0.0 (reference), - 0.99 (- 1.65, - 0.33) and - 0.22 (- 0.88, 0.44), and of Hb were 0.0 (reference), - 0.74 (- 1.41, - 0.08) and - 0.77 (- 1.46, - 0.08). In hypertensive women, iron status was linearly and positively associated with ASCVD risk. Per one unit increment of log-transformed SF as well as Hb was associated with a 1.22 (95% CI: 0.97, 1.48) and 0.04 (95% CI: 0.02, 0.07) increased in ASCVD risk score, respectively. A significant interaction between iron status and inflammation on ASCVD risk was observed in hypertensive women. SF and Hb showed a U-shape with ASCVD risk in hypertensive men; however, a positive linear relationship was observed in hypertensive women.
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