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    The effects of cranial irradiation on growth hormone secretion.

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    Authors
    Ahmed, S Rafeeq
    Shalet, Stephen M
    Beardwell, Colin G
    Affiliation
    Department of Endocrinology, Christie Hospital and Holt Radium Institute, Manchester M20 9BX, UK
    Issue Date
    1986-03
    
    Metadata
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    Abstract
    Growth hormone (GH) secretion has been studied under physiological conditions and in response to standard pharmacological stimuli in 14 children, who had previously received cranial irradiation between two and fourteen years earlier. All fourteen showed a blunted GH response to insulin hypoglycaemia and, in twelve, the GH response to arginine stimulation was also subnormal. Physiological GH secretion was studied by measuring integrated GH concentrations in 30 min blood samples collected over a 24 hour period by a continuous withdrawal pump. Compared to normal controls (n = 5), the irradiated patients showed a significant reduction in the mean integrated GH concentration (2.2: 8.8 mU/l; p less than 0.002), the total 24 hour GH output (mean 105.7 mU vs. 391.7 mU; p less than 0.002) and the mean GH output during the first six hours of sleep (mean 48.2 mU vs. 226 mU; p less than 0.002). There was no significant correlation between the maximum peak GH response to either pharmacological test and the total 24 hour GH output. Conventionally most short children undergo two provocative tests of GH release and if the GH response to one of the two tests is normal, it is usually assumed that GH production is adequate. Adopting these criteria in this study it would have been assumed incorrectly that GH production was normal in two children. Nonetheless all 14 children showed a blunted GH response to an ITT as well as a reduced total 24 hour GH output.(ABSTRACT TRUNCATED AT 250 WORDS)
    Citation
    The effects of cranial irradiation on growth hormone secretion. 1986, 75 (2):255-60 Acta Paediatr Scand
    Journal
    Acta Paediatrica Scandinavica
    URI
    http://hdl.handle.net/10541/115180
    DOI
    10.1111/j.1651-2227.1986.tb10195.x
    PubMed ID
    3457517
    Type
    Article
    Language
    en
    ISSN
    0001-656X
    ae974a485f413a2113503eed53cd6c53
    10.1111/j.1651-2227.1986.tb10195.x
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