Elsevier

Atherosclerosis

Volume 233, Issue 1, March 2014, Pages 278-283
Atherosclerosis

Testosterone deficiency: A determinant of aortic stiffness in men

https://doi.org/10.1016/j.atherosclerosis.2013.12.010Get rights and content

Highlights

  • We assessed the association between testosterone and arterial stiffness in men without cardiovascular disease.

  • We investigated the influence of androgen level on the age- and blood-pressure related increase in aortic stiffness.

  • Testosterone concentration is a potent independent determinant of aortic stiffness.

  • Younger patients with testosterone deficiency have higher vascular age.

  • The effect of testosterone deficiency on aortic stiffness is more prominent in subjects with higher blood pressure levels.

Abstract

Objective

Low testosterone levels and increased aortic stiffness are predictors of cardiovascular events. The influence of androgen level on the age- and blood pressure-related increase in aortic stiffness is unknown.

Methods

From January 2007 to June 2011 we enrolled 455 consecutive men with no evidence of cardiovascular disease from a large cohort followed in our Department for arterial function studies. Their total testosterone (TT) levels were measured and carotid-femoral pulse wave velocity (PWVc-f) was measured as an index of aortic stiffness.

Results

In multivariable analysis, PWVc-f values were inversely correlated to TT after adjustment for confounders (β = −0.365, P < 0.001). In younger age categories (<50 yrs and 50–59 yrs), patients with testosterone deficiency (TD) had higher blood pressure-adjusted PWVc-f (P < 0.001 and P = 0.005, respectively) compared to subjects with normal TT, indicating an “aging effect” of 10 years, whereas in older age categories such a difference was not observed. Furthermore, in men with a higher mean pressure (102–108 mmHg and >108 mmHg), patients with TD had higher age-adjusted PWVc-f (P < 0.001) compared to subjects with normal TT, indicating a synergistic unfavorable effect of testosterone deficiency and blood pressure on aortic stiffness.

Conclusions

TT levels are independently associated with aortic stiffening. The effect of low testosterone concentration on aortic stiffness is more prominent in young men and in subjects with higher blood pressure levels. These findings identify testosterone as a marker of arterial damage with special emphasis on young and hypertensive individuals and support its role as predictor of events.

Introduction

Increasing attention is focused on the adverse effects of testosterone deficiency on cardiovascular (CV) health. Men with lower testosterone levels tend to have higher incidence of cardiovascular risk factors and coronary artery disease [1], [2]. As we and others have shown, testosterone deficiency has emerged as an important predictor of future cardiovascular events and all-cause mortality both in the general population and in patients with disease states [3], [4], [5]. On the other hand, the levels of testosterone undergo age-related decline [6], while there is also evidence suggesting that risk factors such as hypertension may hasten the age-related fall in testosterone levels [7].

Carotid-femoral (aortic) pulse wave velocity (PWVc-f) is the gold-standard index for assessment of aortic stiffness [8]. Its implementation in clinical practice is based on its reliability, ease of use [9], and predictive value for future CV events and all-cause mortality independent of classic CV risk factors [10], [11] both in the general population [12] and in patients with disease states [13], [14]. It has been included as a recommended test in the recent European Society of Cardiology/European Society of Hypertension guidelines for the management of arterial hypertension [15]. Aortic PWV is strongly dependent on age and blood pressure (BP) [8], [16].

Low testosterone has been associated both through causal and associative relationships with functional and structural changes in the properties of the arterial wall. Studies that investigated the association between testosterone and arterial elastic properties involved diverse populations, such as either elderly [17] or young [18] subjects, as well as patients with diabetes [19], prostate cancer [17], [20] or hemodialysis [21]. In the present study, we sought to investigate whether testosterone levels are associated with aortic stiffness in a population with a broad range of age and risk factors without overt cardiovascular disease. We also assessed the influence of androgen level on the age- and blood-pressure related increase in aortic stiffness.

Section snippets

Study population

From January 2007 to June 2011 we enrolled consecutive men from a large cohort followed in our Department for arterial function studies. All participants were screened for sociodemographic data and risk factors for cardiovascular disease and comprehensively evaluated using medical history, physical examination and electrocardiogram. In the present study, patients with a history of coronary artery disease, stroke or peripheral artery disease and subjects with untreated sleep apnea, chronic

Population characteristics

The baseline clinical characteristics of the 455 participants are given in Table 1. One-hundred and nine (24%) patients had biochemical TD, while 23 of those (5%) had TT levels below 2.5 ng/ml (severe TD). Compared to patients with normal TT levels, subjects with TD were older (P < 0.001) and had higher BMI (P < 0.05), waist circumference (P < 0.05), systolic pressure (P < 0.01), pulse pressure (P < 0.001), fasting blood glucose (P < 0.001), C-reactive protein (P < 0.01) and a higher prevalence

Discussion

Our study is the first, to the best of our knowledge, to demonstrate the association between testosterone levels and arterial stiffness over a broad range of men without manifest cardiovascular disease. Specifically, testosterone concentration is a potent independent determinant of PWVc-f, while the effect of testosterone deficiency on aortic stiffness is more prominent in young men and in subjects with higher BP levels. Our observations highlight the role of testosterone as a marker of

Conclusion

In conclusion, this is the first study to demonstrate that testosterone is independently associated with aortic stiffness over a broad range of individuals without manifest cardiovascular/atherosclerotic disease. Our results highlight the important role of testosterone deficiency as a marker of vascular damage with special emphasis on young and hypertensive individuals. Further investigations are warranted to determine possible causal relationships and to define whether low testosterone should

Conflict of interest

The authors declare no conflict of interest.

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