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Simultaneous study of somatotrophic and corticotrophic pituitary secretions during ornithine infusion test
Insights
The ornithine infusion test effectively stimulates growth hormone (GH) and cortisol release in children with short stature. This test is safe and useful for evaluating pituitary function in pediatric growth delay.
Area of Science:
- Pediatric Endocrinology
- Hormone Secretion Studies
- Growth Disorders
Background:
- Constitutional short stature is a common concern in pediatrics.
- Accurate assessment of pituitary hormone secretion is crucial for diagnosing growth problems.
- Existing diagnostic methods may have limitations in evaluating multiple pituitary axes.
Purpose of the Study:
- To evaluate the efficacy of the ornithine infusion test in stimulating both growth hormone (GH) and adrenocorticotropic hormone (ACTH) / cortisol secretion.
- To assess the utility of this test in children with constitutional short stature.
- To determine if the test can differentiate normal pituitary response from deficiencies.
Main Methods:
- Fifty-four children with constitutional short stature underwent an ornithine infusion test.
- Blood samples were collected at intervals to measure levels of GH, ACTH, and cortisol.
- Three children with panhypopituitarism served as controls.
Main Results:
- Ornithine infusion led to a significant elevation in GH levels at 45 minutes (mean 873 pmol/l).
- Cortisol levels also rose significantly (mean 544 nmol/l), preceded by an ACTH peak.
- Children with panhypopituitarism showed no GH or cortisol response.
Conclusions:
- The ornithine infusion test is a well-tolerated and effective method for simultaneously assessing somatotropic (GH) and corticotropic (ACTH/cortisol) pituitary function in children.
- This test aids in the diagnosis of growth delay and pituitary dysfunction in pediatric patients.
- It provides a valuable tool for evaluating children with short stature.
Abstract:
An ornithine infusion test was performed in fifty-four children with constitutional short stature. The ornithine infusion induced an elevated level of GH at 45 min (mean value = 873 pmol/l) and a similar rise of cortisol levels (mean value = 544 nmol/l). An important peak of ACTH appeared 15 min before the increase of cortisol. In three panhypopituitary dwarfs studied, no elevation of GH or cortisol was observed. The well tolerated ornithine infusion test allows the simultaneous study of the somatotropic and corticotropic pituitary secretions in children with delayed growth.