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Biomedical subjects

P H Rayner

Publications and source records attributed to P H Rayner.

At least 37 records · Page 2Linked to original sources
PubMed1980

Serum dehydroepiandrosterone (DHA) and sulphate (DHAS) after acute growth hormone therapy.

To test the hypothesis that growth hormone (hGH) may increase adrenal androgen production dehydroepiandrosterone (DHA) and its sulphate (DHAS) concentrations were measured by radioimmunoassay in the serum from 7 children with growth hormone deficiency, 2 of whom had delayed puberty. Two injections of hGH (10 mg) were given 48 h apart and the hormone concentrations measured at 3, 6, 24 and 48h after the first injection, 3, 6, and 24h after the second. Basal DHA levels were positively correlated with age and bone age in 6 of the 7 patients (p less than 0.05). Increment of DHA and DHAS above or below basal at each time interval were calculated. The mean increments were higher (p less than 0.01-0.05) at 3 h after the first injection and at 24h (p lesal DHA concentrations were positively correlated with increments in DHA during the first and second 24h of the test (p less than 0.05). DHAS concentrations showed little change throughout the test for all children. It is suggested that some children with growth hormone deficiency and receptive adrenals, increase their serum DHA concentrations after acute hGH therapy.

Adolescent↗
PubMed1977

Somatomedin in growth disorders and chronic renal insufficiency in children.

Somatomedin activity was measured using an embryonic chick cartilage assay in 33 normal and short normal children, 23 children with pituitary growth hormone (GH) deficiency, 14 children with sexual precocity, and 13 children with chronic renal insufficiency. In normal children somatomedin activity correlated well with chronological age: low valles in early childhood rose to higher than adult levels at puberty. Children with GH deficiency had significantly lower activities and those with sexual precocity significantly higher activities than normal children. In all three groups somatomedin activity correlated well with bone age. In children with chornic renal insufficiency there was a significant correlation between decreasing somatomedin activity and both a reduced growth velocity and a falling glomerular filtration rate. Somatomedin activity and growth velocity were within normal limits in children with glomerular filtration rates above 30 ml/min/1-73 m2.

Adolescent↗
PubMed1977

Nyctohemeral secretion of growth hormone in normal children of short stature and in children with hypopituitarism and intrauterine growth retardation.

A continuous blood sampling technique has been used to monitor human growth hormone (GH) during sleep in fourteen normal short children (age range 6.5-15.0 years), twelve hypopituitary children (2.8-17.3 years), three children with psychosocial GH deficiency (4.0-13.0 years), and three children with intrauterine growth retardation (9.5-11.3 years). The mean GH level of a 5 h sleep period (22.30-03.30 hours) was used to represent the GH response to sleep. The GH response to insulin induced hypoglycaemia (IST) was also determined. In normal short children there was a significant relationship between 5 h mean GH levels and chronological age. The curve defining this relationship was similar to the third centile linear growth velocity curve. The 5 h mean GH levels of the hypopituitary and psychosocial GH deficiency children were more than 2 SD below the age related mean established for normal short children. The children with intrauterine growth retardation demonstrated values which were more than 2 SD above the age related mean.

Adolescent↗
PubMed1975

A radioimmunoassay for the estimation of serum dehydroepiandrosterone sulphate in normal and pathological sera.

A radioimmunoassay is described for the measurement of dehydroepiandrosterone sulphate in serum. The method requires 0.1 ml of serum that needs no purification other than a single ether extraction. It is both rapid and economical, procedural losses are small and precision and accuracy are acceptable for both normal and pathological sera. Normal values have been established for children and adults which show a relationship to chronological age, values rising steadily as puberty intevenes, peak values occurring between 20 and 27 years, with a decline thereafter. An empirical curve was fitted to the data and approximate normal limits were obtained. The mean value for pregnanat women in the age range 20-40 years, was statistically significantly lower than in non-pregnant, premenopausal women. The levels of dehydroepiandrosterone sulphate in cord and newborn blood, were higher than at any other time during childhood until signs of puberty were demonstrable. Elevated levels are reported in six patients with untreated congenital adrenal hyperplasia and in one patient with a tumour of the adrenal cortex. It is suggested that this assay provides a useful and precise index of adrenal androgen secretion.

Adolescent↗