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Hypothalamic-pituitary dopaminergic function in hepatic failure in man

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Summary

The growth hormone (GH) response to apomorphine HCl (Apo) (0.75 mg sc), a dopamine (DA) receptor agonist, was assessed in healthy chronic alcoholics without cirrhosis (N=20) and in patients with alcoholic cirrhosis both with (N=5) and without (N=14) hepatic encephalopathy (HE). A significant number of cirrhotic patients with (P<0.004) and without (P<0.002) HE had an impaired GH response (peak increment<5 ng/ml) compared with non-cirrhotic individuals. An impaired GH response was independent of the presence of HE. The magnitude of the GH response was unrelated to plasma oestrone, oestradiol, or progesterone concentrations but was significantly correlated with plasma testosterone levels (P<0.01). None of the patients with an abnormally low testosterone concentration showed a normal GH response. None of the subjects with HE showed an arousal response to Apo. These results suggest that DA receptor sensitivity is decreased in liver cirrhosis and that this decrease is related to inadequate circulating levels of testosterone. The occurrence of HE is independent of impaired DA function. The present study only evaluates DA function in the hypothalamic-pituitary axis and therefore may not reflect changes in other regions of brain.

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Lal, S., Oravec, M., Aronoff, A. et al. Hypothalamic-pituitary dopaminergic function in hepatic failure in man. J. Neural Transmission 53, 7–21 (1982). https://doi.org/10.1007/BF01243516

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