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Journal of Clinical Endocrinology & Metabolism, Vol 80, 1238-1242, Copyright © 1995 by Endocrine Society
ARTICLES |
I Vermes, A Beishuizen, RM Hampsink and C Haanen
Department of Clinical Chemistry, Medical Spectrum Twente, Enschede, The Netherlands.
The regulatory mechanisms of the hypothalamo-pituitary-adrenal system were studied in critically ill, intensive care unit patients. Serial measurements of immunoreactive ACTH-(1-39) (ACTHi), cortisol, endothelin-1 (ETi), and atrial natriuretic hormone (ANHi) were performed in blood samples of 18 patients with clinically defined sepsis, 12 critically ill patients after multiple trauma, and 15 hospitalized matched control subjects without acute illness for 8 consecutive days after admission. On admission, plasma levels of cortisol and ACTHi were significantly elevated in patients with sepsis (1.32 +/- 0.21 mumol/L and 130.0 +/- 38.2 pmol/L, mean +/- SD) and with multiple trauma (1.23 +/- 0.28 mumol/L and 123.7 +/- 41.3 pmol/L) compared to those in the control subjects (0.37 +/- 0.08 mumol/L and 15.6 +/- 5.8 pmol/L, respectively). The plasma cortisol levels of critically ill patients remained high (> 0.8 mumol/L) during the whole observation period. In contrast, plasma ACTHi levels decreased between days 3-5, reaching significantly lower levels on day 5 compared to those in the control group and remained below 5.0 pmol/L during the rest of the observation period. Plasma levels of ETi and ANHi were significantly elevated during the whole period in both patient groups (ETi, > 10 ng/L; ANHi, > 250 ng/L) compared to those in control subjects (< 5 and < 50 ng/L, respectively). The high plasma concentration of ETi observed in our patients may stimulate the steroid secretion of the adrenal cortex directly or potentiate the adrenal effect of ACTH. On the other hand, the increased concentration of ANHi found in critically ill patients together with the increased plasma cortisol level may explain the inhibition of ACTH secretion. Accordingly, we speculate that the high ET level exerts a positive drive on the adrenocortical level, that the high ANH level has an inhibitory effect on the hypothalamo-pituitary level, and that both mechanisms play a role in regulation of the hypothalamo-pituitary- adrenal axis during critical illness.
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