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Comparison between buserelin and dexamethasone testing in the assessment of hirsutism

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Abstract

Many hirsute women may present a form of functional ovarian hyperandrogenism (FOH), since they show an exaggerated 17-hydroxyprogesterone (17-OHP) response to GnRH agonists administration. As the failure of dexamethasone to reduce testosterone levels may be indicative of an ovarian source of androgen secretion, we evaluated the usefulness of dexamethasone suppression test, in comparison with buserelin challenge, in the assessment of hirsutism. Twenty-seven hirsute women (aged 15–42 yr) underwent ACTH and buserelin tests: 4 patients were heterozygotes for 21-OH deficiency and 8 patients were affected with FOH: 2 of the patients with hyperresponse to buserelin also had 21-hydroxylase deficiency. The results of the dexamethasone suppression test (2 mg/day for 7 days) were compared to those obtained after buserelin test. Basal T and Δ4 levels (mean±SE) were higher than in controls (4.2±0.5 vs 2.2±0.2 nmol/l and 10.9±0.9 vs 5.9±0.6 nmol/l, p<0.02), while no differences were found in 17-OHP and DHEAS levels. A significant reduction (p<0.001) in T (1.8±0.4 nmol/l), Δ4 (3.2±0.5 nmol/l) and DHEAS levels (2.4±0.3 μmol/l) was observed at the 3rd day of dexamethasone administration and no differences between sampling at 3rd, 5th and 7th day were found. Serum T was not suppressed in 6 cases, Δ? and DHEAS levels in 3 and 1 of them, respectively. Buserelin injection caused an excessive 17-OHP response in 8 patients, only 4 of them did not reduce T levels during dexamethasone. The sensitivity and specificity of the dexamethasone suppression test, with respect to the buserelin test, were 50% and 89%, respectively. In conclusion, 37% of hirsute patients had an abnormal responsiveness to buserelin and/or ACTH tests, indicating that hormonal investigations are mandatory. An ovarian origin of hirsutism was identified by buserelin test in 30% of patients and by dexamethasone in 22% of cases; only 4 of 8 patients showed concordant results to both tests. Therefore, buserelin challenge seems a more useful, cost-effective and less time consuming tool than dexamethasone administration in order to recognize the possible ovarian origin of hyperandrogenism.

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Authors and Affiliations

  1. Institute of Endocrine Sciences, University of Milan, Ospedale Maggiore IRCCS, Milan, Italy, Via F. Sforza 35, 20122

    T. Re, L. Barbetta, C. Dall’Asta, G. Faglia &  B. Ambrosi

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  1. T. Re
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  2. L. Barbetta
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  3. C. Dall’Asta
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  4. G. Faglia
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  5. B. Ambrosi
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Correspondence to B. Ambrosi.

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Re, T., Barbetta, L., Dall’Asta, C. et al. Comparison between buserelin and dexamethasone testing in the assessment of hirsutism. J Endocrinol Invest 25, 84–90 (2002). https://doi.org/10.1007/BF03343965

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