Tall stature: a clinical, endocrinological and radiological study

Area of Science:

• Pediatric Endocrinology
• Growth Hormone Physiology
• Adolescent Medicine

Background:

• Tall stature in children necessitates investigation into growth hormone (GH) secretory dynamics.
• Puberty is a period of significant physiological changes affecting endocrine function.

Purpose of the Study:

• To analyze GH secretory patterns in children with tall stature.
• To correlate endocrine and radiological findings in this cohort.

Main Methods:

• Studied 38 children (25 F, 13 M) with tall stature (Height SD score > 1.8).
• Assessed GH levels via basal measurements, TRH stimulation, oral glucose tolerance tests, insulin-induced hypoglycemia, and 24-hour GH profiling.
• Performed pituitary radiology.

Main Results:

• Some children showed elevated basal GH, abnormal GH responses to TRH, or paradoxical GH responses to oral glucose.
• No concordance between peak GH after insulin-induced hypoglycemia and stage IV sleep GH.
• Increased GH pulse amplitude and area during puberty; morning GH secretion observed.
• Pituitary microadenomata suggested in 17 patients, potentially linked to sex hormones in late puberty.

Conclusions:

• 'Abnormal' endocrine and radiological findings in tall pubertal children require cautious interpretation.
• Physiological pubertal increases in GH secretion may explain some observed paradoxical responses.
• Distinguishing somatotroph pathology from hormonal effects of puberty is crucial.