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Biomedical subjects

D Pearson

Publications and source records attributed to D Pearson.

At least 199 records · Page 11Linked to original sources

EEG signs of brain impairment in alcoholism.

EEGs were recorded for two groups of chronic alcoholics who scored at opposite extremes on the Shipley Institute of Living Scale. The groups were matched in terms of age and drinking history variables and were compared to age-matched control subjects for left and right precentral (F-T) and postcentral (C-O) placements. Significant ANOVA findings were obtained primarily in high-frequency bands in the three group comparison. A significant linear trend was found for power as a function of degree of impairment from controls to moderately impaired alcoholics to severely impaired alcoholics in frequency bands above 14 Hz. The trend was most pronounced in the F-T derivations. Implications of the findings with respect to cortical atrophy in alcoholism are discussed.

Adult↗

Thyroid dysfunction following external irradiation to the neck for Hodgkin's disease in childhood.

Thyroid function was studied in 32 patients who had received neck irradiation during childhood for Hodgkin's disease. All except one patient received a dose of 2500-3000 rad over a period of 19-25 days. In 12 patients lymphangiography was performed. Clinically all patients were considered euthyroid. One had a thyroid swelling which was cystic in nature. Five (16%) patients were biochemically hypothyroid, 17 (53%) were euthyroid with an elevated basal serum TSH concentration and a further seven (22%) were euthyroid with a normal basal serum TSH level but an augmented thyroid-stimulating hormone (TSH) response to thyrotrophin-releasing hormone (TRH). Only three (9%) patients had completely normal thyroid function tests. The basal serum TSH concentration and the peak serum TSH response to TRH were significantly greater in the patients who received neck irradiation and lymphangiography than in those who received neck irradiation alone. In addition the free thyroxine index decreased significantly as the time interval between treatment and study increased in the lymphangiography group. These data demonstrate that the normal thyroid gland is vulnerable to the damaging effects of external irradiation, and that the combination of neck irradiation and lymphangiography is more likely to result in thyroid dysfunction than is neck irradiation alone. Furthermore, in view of the deterioration in thyroid function with time, periodic clinical and biochemical assessment of thyroid function is clearly indicated.

Adolescent↗

Endocrine function following the treatment of acute leukemia in childhood.

Pituitary function has been studied in 25 children after treatment of acute leukemia. Impaired growth hormone responses both to hypoglycemia and to Bovril were found in 11 subjects. Elevated basal thyroid-stimulating hormone levels were seen in five children, three of whom had an augmented TSH response to thyrotrophin-releasing hormone. Radiation-induced damage to the hypothalamic-pituitary region is thought to be the cause of these abnormalities in growth hormone and in secretion of TSH. The peak cortisol response to hypoglycaemia is significantly decreased in the group of subjects who received the higher dose of cranial radiation therapy, but no individual child is hypothyroid or shows impaired adrenal function, clinically or biochemically. Three prepubertal girls studied have biochemical evidence of ovarian failure following the use of combination chemotherapy.

Adolescent↗

Endocrine morbidity in adults treated with cerebral irradiation for brain tumours during childhood.

Hypothalamic-pituitary function was assessed in 20 adult subjects who were treated with cerebral irradiation for brain tumours during childhood between 8 and 32 years earlier. Nine patients showed impaired growth hormone (GH) responses to hypoglycaemia, of whom, 7 are below the third centile for standing height. All GH deficient subjects received more than 2950 rads to the hypothalamic-pituitary axis with a maximum dose of approximately 5000 rads being used in one case. Three subjects have an elevated basal serum thyroid stimulating hormone (TSH) level and 2 of these show an exaggerated TSH response to thyrotrophin releasing hormone (TRH) but no patient was clinically or biochemically hypothyroid. The rest of hypothalamic-pituitary function was essentially normal. This study shows that multiple pituitary hormone deficiencies do no develop with time when the radiation dose is below a critical level. Thus it appears that there is a gradation of radiation damage to the hypothalamic-pituitary axis which is dependent primarily on the dose received rather than the time interval after radiotherapy.

Adolescent↗

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