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Plasma total testosterone and incident cardiovascular events in hypertensive patients
Charalambos Vlachopoulos1, Nikolaos Ioakeimidis, Dimitrios Terentes-Printzios
1Peripheral Vessels Unit, First Department of Cardiology, Hippokration Hospital, Athens Medical School, Athens, Greece. cvlachop@otenet.gr
Insights
Low testosterone levels in hypertensive men significantly increase the risk of major adverse cardiovascular events (MACE). Measuring total testosterone (TT) can improve cardiovascular disease risk prediction in these patients.
Area of Science:
- Endocrinology
- Cardiology
- Men's Health
Background:
- Androgen deficiency is an independent risk factor for cardiovascular events and mortality.
- Hypertension is linked to a higher prevalence of low testosterone.
- This study investigates low androgen levels as a predictor of cardiovascular events in hypertensive men.
Purpose of the Study:
- To determine if low androgen concentration predicts incident major adverse cardiovascular events (MACE).
- To assess the predictive value of total testosterone (TT) for MACE in nondiabetic hypertensive patients.
Main Methods:
- Analysis of MACE in relation to TT using proportional hazards models.
- Study included 228 middle-aged, nondiabetic hypertensive male patients.
- Mean follow-up duration was 44 months.
Main Results:
- 19 participants (8.3%) experienced a MACE.
- Patients with MACE had lower TT (3.9±0.7ng/ml) vs. those without (4.6±1.5ng/ml).
- Lowest TT tertile (<4.0ng/ml) showed a significantly higher risk of MACE.
- A TT level of 5.04ng/ml had a 97.2% negative predictive value for MACE.
Conclusions:
- Low plasma testosterone is associated with an increased risk of MACE in hypertensive patients.
- Low endogenous androgen concentration improves cardiovascular disease risk prediction.
- Testosterone may serve as a valuable biomarker for predicting cardiovascular risk.
Background:
Androgen deficiency confers an independent risk for cardiovascular events and total mortality. Hypertension, a major contributory factor to the development of cardiovascular disease, has also been associated with increased prevalence of low testosterone. We investigated whether low androgen concentration predicts incident major adverse cardiovascular events (MACE) in middle-aged nondiabetic hypertensive patients without clinical atherosclerosis.
Methods:
MACE in relation to total testosterone (TT) were analyzed with proportional hazards models in 228 male patients (mean age 56 years).
Results:
During a mean follow-up of 44 months, 19 of 228 participants (8.3%) experienced a MACE. Compared to patients who did not experience MACE, hypertensive subjects who developed MACE had lower TT concentration (3.9±0.7ng/ml vs. 4.6±1.5ng/ml, P < 0.01) and a higher prevalence of hypogonadism (36% vs. 16%, P < 0.05). Subjects in the lowest TT tertile (<4.0ng/ml) had a statistically significant higher risk of MACE compared to those in the highest tertile (>4.9ng/ml) in multivariate Cox models adjusted for age, systolic blood pressure, and risk factors (all P < 0.05). A TT plasma level of 5.04ng/ml was associated with a negative predictive value (ability to "rule out" MACE) of 97.2%. Addition of TT to standard risk factors model yielded a net reclassification improvement of 38.8 % (P < 0.05).
Conclusions:
Our results show that low plasma testosterone is associated with increased risk for a MACE in hypertensive patients. Low endogenous androgen concentration improves risk prediction when added to standard risk factors and may represent a valuable biomarker of prediction of cardiovascular disease risk in these patients.
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