Endocrine Abstracts

Introduction: Male obesity is associated with an increase in estradiol (E₂) and a decrease in testosterone (T). And, although sex steroids are associated with cardiovascular disease, direct effects on cardiac structure and function are hardly investigated in humans.

Methodology: Twenty healthy men aged 20–40 years were randomized into two groups. One group was given an aromatase inhibitor (letrozole) only, thus obtaining a high testosterone and low E₂ (group T). The other group received an aromatase inhibitor plus an E₂ patch (dermestril), reaching a low testosterone and high E₂ (group E). Serum levels of both testosterone and E₂ remained within the normal reference range. The men underwent an echocardiography by a single cardiologist before the start of the intervention and after 7 days.

Results: Total and free E₂ serum levels were positively associated with ejection fraction (r=0.7, P=0.002 and r=0.6, P=0.007 respectively) at baseline in the whole group. In group E global circumferential strain decreased significantly from −25.3%±3.9 to −19.6%±2.5 after 1 week as compared to baseline (P=0.01). No significant changes in systolic function were observed in group T. Cardiac structure remained unaltered.

Conclusion: In young healthy men, an increase in E₂ and decrease in testosterone levels significantly decreased circumferential strain. The finding justifies larger studies of longer duration to discover the exact nature of the impact of changed sex steroids on cardiac function and remodelling in obesity.