[The GHRH test in Turner's syndrome]

Area of Science:

• Pediatric Endocrinology
• Genetics
• Growth Disorders

Background:

• Turner syndrome is associated with short stature.
• The role of growth hormone (GH) deficiency in Turner syndrome pathogenesis is not fully understood.
• Hypothalamic dysfunction can impact GH secretion.

Purpose of the Study:

• To evaluate the utility of the GHRH test in assessing GH secretion in girls with Turner syndrome.
• To investigate the correlation between GHRH test results and various growth parameters.
• To compare GH secretion in Turner syndrome with other short stature conditions.

Main Methods:

• The GHRH test was administered to 11 girls with Turner syndrome (age 5.6-13.5 years).
• GH peak, area under the curve, and spontaneous GH secretion were measured.
• Results were compared with conventional pharmacological stimuli and other short stature cohorts.

Main Results:

• Three subjects showed low GH peak (<10 ng/ml) after GHRH stimulation, consistent with reduced response to pharmacological stimuli.
• GH peak and area under the curve did not correlate with height, height velocity, or bone/chronological age ratio.
• GH secretion in Turner syndrome was higher than classical GH deficiency but lower than short normal stature.

Conclusions:

• GH deficiency may play a role in the short stature observed in Turner syndrome.
• The findings suggest a predominantly hypothalamic origin for GH deficiency in these patients.
• Variability in GHRH test responses highlights the complexity of GH secretion in Turner syndrome.