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.

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