Acta endocrinologica
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Acta endocrinologica · Feb 1977
Studies on the pattern of circulating steroids in the normal menstrual cycle. Circadian variation in theperi-ovulatory period.
Circadian variations of the plasma levels of dehydroepiandrosterone, 17-hydroxypregnenolone, pregnenolone and testosterone were investigated by radioimmunoassay in 10 normally menstruating women during the periovulatory period. In seven of the subjects it was also possible to estimate androstenedione and dihydrotestosterone levels. Blood was withdrawn continuously over a period of 48 h at a rate of 4 ml/h by means of a non-thrombogenic pump. ⋯ An analysis of variance indicated no significant differences between sampling periods as far as dihydrotestosterone levels were concerned. The extent and regularity of the circadian variation in the plasma levels of the 5-steroids studied makes it mandatory to standardize very carefully the exact time of blood withdrawal in any longitudinal study. In view of the sharp changes in the plasma levels during the morning hours, it is suggested that sampling during the afternoon period may provide more constant values.
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Acta endocrinologica · Feb 1977
The influence of combined cyproterone acetate-ethinyl oestradiol therapy on serum levels of dehydroepiandrosterone, androstenedione, and testosterone in hirsute women.
Serum levels of dehydroepiandrosterone, androstenedione, and testosterone in hirsute women suffering from either idiopathic hirsutism or the polycystic ovary syndrome were determined before and during treatment with cyproterone acetate combined with ethinyl oestradiol. During this treatment the hirsutism decreased markedly. In untreated hirsute women serum dehydroepiandrosterone levels do not differ from those in normal women and do not change during therapy; androstenedione levels are higher than normal and decrease markedly during treatment, and the testosterone levels are elevated compared to normals, with a considerable overlap, and show only a tendency to decrease. ⋯ After 12-14 months of cyproterone acetate-ethinyl oestradiol therapy a linear correlation is found between dehydroepiandrosterone and androstenedione levels. This can be explained by the relatively higher contribution of the peripheral conversion of dehydroepiandrosterone to androstenedione to the occurrence of lower androstenedione levels. The linear correlation between androstenedione and testosterone after treatment, also found in normal women, indicates the restoration of the role of androstenedione as the major peripheral precursor of testosterone.