Research article

Factors influencing the growth hormone peak and plasma insulin-like growth factor I in young adults with pituitary stalk interruption syndrome

Mariana Marcu¹ , Christine Trivin² , Jean-Claude Souberbielle² and Raja Brauner¹

¹Université Paris Descartes and Assistance Publique Hôpitaux de Paris, Hôpital Bicêtre, Unité d'Endocrinologie Pédiatrique, 94270 Le Kremlin Bicêtre, France

²Assistance Publique Hôpitaux de Paris, Hôpital Necker-Enfants Malades, Service d'Explorations Fonctionnelles, 75743 Paris, France

author email corresponding author email

BMC Endocrine Disorders 2008, 8:7doi:10.1186/1472-6823-8-7

Published:	11 July 2008

Abstract

Background

The diagnostic criteria for growth hormone (GH) deficiency (GHD) in adolescents and young adults are not yet clearly established.

We evaluated the factors influencing the GH peak and plasma insulin-like growth factor (IGF) I in order to determine the cut-off limits for the diagnosis of GHD during the transition period.

Methods

21 patients treated for GHD due to pituitary stalk interruption syndrome at 5.7 ± 4.1 years were reevaluated at 16.0 ± 1.8 years, 0.6 ± 0.6 years after the end of GH treatment. Group 1 had isolated GHD (n = 9) and group 2 had multiple pituitary deficiencies (n = 12), including deficiencies of thyroid stimulating (n = 12), adrenocorticotropin (n = 8) and gonadotropin (n = 9) hormones.

Results

At diagnosis, group 1 had a greater pituitary height (2.8 ± 1.2 vs 1.6 ± 1.1 mm, P = 0.03) and GH peak (3.8 ± 1.9 vs 1.6 ± 1.5 ng/ml, P < 0.02) than did group 2.

At last evaluation, group 1 had greater GH peak (3.9 ± 1.9 vs 0.2 ± 0.4 ng/ml, P = 0.0001) and plasma IGF I (211 ± 88 vs 78 ± 69 ng/ml, P < 0.002) than did group 2. No group 1 and 9 group 2 patients had an undetectable GH peak, while the 3 others had GH peak below 1 ng/ml.

The GH peak decreased between diagnosis and last evaluation only in group 2 (P < 0.008).

Conclusion

The GH peak response to pharmacological stimulation and the plasma IGF I concentration in young adults with GHD of childhood onset depend on the presence of additional pituitary deficiencies, reflecting a more severe defect of the hypothalamic-pituitary axis. The sex steroids cannot increase the IGF I if the GH secretion is zero.