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Impact of cardiovascular risk factors on carotid intima–media thickness: sex differences

Authors Ɓoboz-Rudnicka M, Jaroch J, Bociąga Z, Rzyczkowska B, Uchmanowicz I, PolaƄski J, Dudek K, Szuba A, Ɓoboz-GrudzieƄ K

Received 3 January 2016

Accepted for publication 4 February 2016

Published 23 May 2016 Volume 2016:11 Pages 721—731

DOI https://doi.org/10.2147/CIA.S103521

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Lucy Goodman

Peer reviewer comments 4

Editor who approved publication: Dr Richard Walker

Maria Ɓoboz-Rudnicka,1 Joanna Jaroch,1 Zbigniew Bociąga,1 Barbara Rzyczkowska,1 Izabella Uchmanowicz,2 Jacek PolaƄski,3 Krzysztof Dudek,4 Andrzej Szuba,5 Krystyna Ɓoboz-GrudzieƄ2 
 
1Department of Cardiology, T. Marciniak Hospital, 2Public Health Department, Wroclaw Medical University, 3Private Practice, Na Biskupinie, Wroclaw, 4Faculty of Mechanical Engineering, Wroclaw University of Technology, 5Division of Angiology, Wroclaw Medical University, Wroclaw, Poland

Background and purpose: There has been growing interest in the sex-related differences in the impact of cardiovascular (CV) risk factors on carotid intima–media thickness (CIMT). Therefore, we aimed at examining the influence of CV risk factors on CIMT in men and women and identifying differences between males and females in the risk profiles affecting CIMT.
Patients and methods: The study group consisted of 256 patients (mean age 54.7 years), including 134 females (52%), with the following CV risk factors: arterial hypertension, type 2 diabetes mellitus, dyslipidemia, nicotine addiction, overweight, and obesity. Subjects with the history of any overt CV disease were excluded. CIMT was measured through B-mode ultrasound examination of the right common carotid artery. In the analysis of CIMT values at different ages, the patients were divided into three age groups: 1) <45 years, 2) 45–60 years, and 3) >60 years. Regression analysis was used to examine the influence of CV risk factors on CIMT in men and women.
Results: CIMT increased with age in both men and women. Women had lower values of CIMT than men (0.54 mm vs 0.60 mm, P=0.011). The analysis in three age subgroups revealed that CIMT values were comparable in men and women in group 1 (0.48 mm vs 0.48 mm, P=0.861), but over the age of 45 years, CIMT values became significantly lower in women compared to men (group 2: 0.51 mm vs 0.63 mm, P=0.005; group 3: 0.63 mm vs 0.72 mm, P=0.020). Significant differences were observed between the sexes in terms of risk factor impact on CIMT. In men, only three factors significantly affected CIMT: age (b=+0.009, P<0.0001), hypertension (b=+0.067, P<0.05), and type 2 diabetes (b=+0.073, P<0.05). In women, apart from age (b=+0.008, P<0.0001) and type 2 diabetes (b=+0.111, P<0.01), significant factors were pulse pressure (PP; b=+0.005, P<0.0001), body mass index (b=+0.007, P<0.05), increased waist circumference (b=+0.092, P<0.01), and metabolic syndrome (b=+0.071, P<0.05). In the multiple regression analysis, independent CIMT determinants for the entire group were age (β=0.497, P<0.001) and body mass index (β=0.195, P=0.006). For males, age was the only independent determinant of CIMT (β=0.669, P<0.001). For females, these were PP (β=0.317, P=0.014), age (β=0.242, P=0.03), and increased waist circumference (β=0.207, P=0.048).
Conclusion: CIMT values are lower in women than in men, which is most pronounced over the age of 45 years. There are sex-related differences in the profile of CV risk factors affecting CIMT: in males, CIMT is mostly determined by age, while in females, by age, PP, and increased waist circumference.

Keywords:
carotid intima media thickness, risk factors, sex differences

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