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Biomedical subjects

M C Hallberg

Publications and source records attributed to M C Hallberg.

At least 19 recordsLinked to original sources
PubMed1979

Effect of dietery weight loss on sex steroid binding sex steroids, and gonadotropins in obese postmenopausal women.

Measurements of SSBG, E2, T, and gonadotropins were performed in 12 obese postmenopausal women before, during, and after a supplemented fast. Weight loss (mean 18 kg) was associated with an increase in SSBG to levels above those seen in nonobese postmenopausal women, a decrease in serum E2 levels, unchanged T levels, and an increase in both gonadotropins. Thus we conclude that weight change or the circumstances associated with it lead to alterations in circulating levels of SSBG. These observations are consistent with the presence of elevated free T and possibly higher free E2 levels in obese postmenopausal women.

Body Weight↗
PubMed1976

Impaired Leydig cell reserve and altered serum androgen binding in the aging male.

The hormonal profile of the aging male reveals an associated decrease in free testosterone and 5 alpha-dihydrotestosterone (DHT) levels and increased luteinizing hormone levels. Later events consist of a decrease in total testosterone, stable DHT, and increased follicle-stimulating hormone and estradiol levels. Although most available information supports the concept of impaired Leydig cell reserve, our study suggests some degree of hypothalamic-pituitary dysfunction. The signal for increased androgen binding with age is not clear. There is a great deal of individual variation in the time of onset of these events.

Aged↗
PubMed1976

Certain metabolic consequences of jejunoileal bypass.

Jejunoileal bypass for obesity has been shown to be associated with increased hepatic triglycerides during the period of brisk weight loss. The current report describes certain metabolic changes observed in 29 patients 21 months after bypass. Significant decreases in serum cholesterol, serum triglycerides, blood sugar after a glucose load, and fasting plasma insulin levels were noted. Increased oxalate excretion and occasional episodes of hypomagnesemia occurred. Repeated clinical and laboratory observations by a medical-surgical team offer the best opportunity to evaluate this procedure.

Adolescent↗
PubMed1976

17beta-ol androgens and free index in hirsute and hirsute obese women.

We have found the mean levels of combined serum testosterone and dihydrotestosterone (T+DHT) and the free index (FI) to be significantly higher and the mean dihydrotestosterone precipitation index (DHT-PI) to be significantly lower in hirsute women than in normal women. Although the mean T+DHT values of the different groups of hirsute patients were comparable, the FI value of the oligomenorrheic and/or obese patient was higher than that of the nonobese, normally menstruating group. In addition, the mean DHT-PI level of obese patients was significantly lower than that of nonobese patients. The lowest androgen binding was found in obese patients with oligomenorrhea. In our experience, hirsutism is associated with T+DHT values of 150 ng/dl or lower. Measurement of androgen binding and androgen levels in unchromatographed serum extracts provides valuable information in the treatment of hirsute women.

Adolescent↗
PubMed1975

Effect of synthetic gonadotropin-releasing hormone (GnRH) in a patient with the "fertile eunuch" syndrome.

A patient with isolated LH deficiency ("fertile eunuch" syndrome) was given synthetic gonadotropin releasing hormone (GnRH) by a single intravenous injection and serum levels of follicle-stimulating hormone (FSH), luteinizing hormone (LH), testosterone and dihydrotestosterone were measured. A significant rise in both gonadotropins was found after GnRH and the increase was similar to that reported for normal men. No significant change was noted in the serum androgen levels. The patient was re-tested with another single intravenous injection after a 6-h infusion of GnRH two days later. The rise in serum Fsh and LH levels during the infusion was greater than with the initial bolus. A further increase in LH but not FSH concentration was noted when a 150 mug bolus was given at the end of the infusion. Acute (4 day) treatment with human chorionic gonadotropin (hCG) resulted in an increase in the serum testosterone and dihydrotestosterone levels to those observed in normal adult males. The "fertile eunuch" syndrome thus appears to be a hypothalamic disorder. It is consistent with the concept of more than one hypothalamic factor controlling gonadotropin secretion. Other possibilities would be deficient or defective production of a releasing factor affecting one or both gonadotropins. The lack of a definite response of serum androgens to GnRH would appear to be secondary to a decreased number of differentiated Leyding cells.

Adult↗