GH Secretagogues Also Affect Thyroid and Prolactin Hormones in ICU Patients | Research

The takeaway

During prolonged critical illness, spontaneous TSH and prolactin secretion are disrupted, and GH secretagogue infusion affects these hormones alongside GH stimulation.

Multi-hormone effects in ICU
GH secretagogue infusion affected TSH and prolactin in addition to GH in critically ill patients

What the researchers found

Prolonged critical illness disrupts spontaneous TSH and prolactin secretion, and GH secretagogue infusion affects these hormones alongside GH stimulation.

Why it matters

GH secretagogues in the ICU aren't just affecting GH — they influence the entire hormonal milieu, which must be understood for safe clinical use.

How the study worked

Clinical study measuring dynamic TSH and PRL secretion profiles during prolonged critical illness, with and without GH secretagogue infusion.

What this study cannot tell us

Clinical study in critically ill patients — a heterogeneous population. Specific GH secretagogue used, doses, and outcomes not detailed.

How to read the evidence

Moderate clinical evidence characterizing hormonal dynamics in a relevant patient population.

When this study was published

Published in 1997, contributing to understanding GH secretagogue effects in critical care.

The bigger picture

This study showed that GH secretagogue therapy in critical illness has broader hormonal effects than just GH, requiring comprehensive endocrine monitoring.

Questions still open

Should multiple hormone axes be monitored when using GH secretagogues in the ICU?
Are the TSH/PRL effects of GH secretagogues beneficial or harmful in critical illness?

Common questions

Why does critical illness disrupt hormones?

Prolonged critical illness suppresses the hypothalamic-pituitary axis, reducing pulsatile secretion of GH, TSH, prolactin, and other hormones. This contributes to the muscle wasting and metabolic deterioration seen in ICU patients.

Do GH secretagogues fix the hormonal disruption?

Partially. GH secretagogues can restore GH pulsatility, but this study shows they also affect TSH and prolactin, meaning their effects extend beyond GH alone. The full clinical implications of these broader hormonal effects are still being studied.

Read the original research

Thyrotrophin and prolactin release in prolonged critical illness: dynamics of spontaneous secretion and effects of growth hormone-secretagogues.

Clinical endocrinology, 47(5), 599-612

View on PubMed ↗

Citation

Van den Berghe, G; de Zegher, F; Veldhuis, J D; Wouters, P; Gouwy, S; Stockman, W; Weekers, F; Schetz, M; Lauwers, P; Bouillon, R; Bowers, C Y. (1997). Thyrotrophin and prolactin release in prolonged critical illness: dynamics of spontaneous secretion and effects of growth hormone-secretagogues.. Clinical endocrinology, 47(5), 599-612.