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Updated: Sep 23, 2026

A Methodological Approach to Non-invasive Assessments of Vascular Function and Morphology
Published on: February 7, 2015
Hematocrit is associated with carotid atherosclerosis in men but not in women
Concetta Irace1, Monica Ciamei, Andrea Crivaro
1Department of Clinical and Experimental Medicine, University of Catanzaro Magna Graecia, Italy.
Insights
In men, higher hematocrit and blood viscosity correlate with carotid atherosclerosis. Hematocrit independently predicts this condition, suggesting its significance in cardiovascular risk assessment.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Medical Diagnostics
Background:
- Blood viscosity and plasma viscosity are linked to atherosclerosis, but conclusive evidence, especially in women, is lacking.
- Understanding hemorheological factors' role in atherosclerosis is crucial for cardiovascular disease prevention.
Purpose of the Study:
- To determine if hematocrit, blood viscosity, and plasma viscosity are independently associated with carotid atherosclerosis.
- To assess if these hemorheological markers can enhance the prediction of coronary heart disease (CHD) risk.
Main Methods:
- Examined 892 participants for conventional CHD risk factors and hemorheological parameters.
- Assessed carotid atherosclerosis using echo-Doppler, categorizing participants into no, low, and high atherosclerosis groups.
Main Results:
- In men, increasing carotid atherosclerosis correlated with higher hematocrit and blood viscosity.
- In women, increasing carotid atherosclerosis correlated with higher plasma viscosity.
- Hematocrit was independently associated with carotid atherosclerosis in men, while blood viscosity's association diminished after adjustment.
Conclusions:
- Hematocrit and blood viscosity are associated with carotid atherosclerosis in men.
- Hematocrit appears to have an independent effect on carotid atherosclerosis in men, beyond viscosity-mediated effects.
Background:
It is known that blood and plasma viscosities are associated with clinical manifestations of atherosclerosis, though evidence is not conclusive particularly in women.
Objective:
To verify whether hematocrit and blood and plasma viscosities are independently associated with carotid atherosclerosis and whether their measurement can improve the definition of the global coronary heart disease (CHD) risk.
Method:
Eight hundred and ninety-two participants in a cardiovascular disease prevention campaign were examined with regard to conventional CHD risk factors (age, blood pressure, lipids, glucose, body mass index, waist/hip ratio, cigarette smoking and diabetes), hematocrit and blood and plasma viscosities. According to the degree of carotid atherosclerosis, investigated by echo-Doppler, participants were divided in three groups: those without atherosclerosis, those with a low degree of atherosclerosis and those with a high degree of atherosclerosis.
Results:
In men, age, blood pressure, intima-media thickness (IMT), hematocrit (47.4+/-3.7%, 47.8+/-3.7%, 48.4+/-3.7%, P<0.05) and blood viscosity (4.69+/-0.51 cP, 4.77+/-0.55 cP, 4.82+/-0.51 cP, P=0.05) increased with increasing degree of carotid atherosclerosis. In women, age, blood pressure, total cholesterol and low-density lipoprotein-cholesterol, IMT and plasma viscosity (1.42+/-0.12 cP, 1.44+/-0.11 cP, 1.46+/-0.13 cP, P<0.05) increased with increasing carotid score. Analysis of covariance (ANCOVA) showed that after adjusting for hematocrit, blood viscosity was no longer different in the three groups. In discriminant analysis, hematocrit, among the hemorheological variables investigated, was independently associated with carotid score in men (F=3.66, P<0.05). Neither hematocrit nor blood and plasma viscosities were significantly associated with carotid score in women.
Conclusion:
These findings suggest that in men, both hematocrit and blood viscosity are related to carotid atherosclerosis but hematocrit would appear to have an independent effect over and above that mediated by viscosity.
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