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Thyrotropin-releasing hormone stimulation tests in infants
1Division of Pediatric Endocrinology, University of Medicine and Dentistry-New Jersey Medical School, Newark.
The Journal of Clinical Endocrinology and Metabolism
|October 1, 1993
Summary
Thyroid stimulating hormone (TSH) response to thyrotropin-releasing hormone (TRH) stimulation helps evaluate infants with suspected primary hypothyroidism. Hyperresponsiveness may indicate neonatal hypothyroidism requiring further study.
Area of Science:
- Neonatal endocrinology
- Pediatric thyroid disorders
- Clinical diagnostics
Background:
- Infants with abnormal newborn thyroid screening require further evaluation.
- Mildly abnormal serum thyroid function tests necessitate precise diagnostic tools.
Purpose of the Study:
- To assess the utility of the TSH response to TRH stimulation in diagnosing primary hypothyroidism in infants.
- To differentiate between normal and hyperresponsive TSH responses to TRH in infants with abnormal thyroid screening.
Main Methods:
- Measured TSH response to TRH administration (7 micrograms/kg) in 68 infants with abnormal thyroid screening.
- Categorized infants into normal (peak TSH ≤ 35 mU/L) and hyperresponsive (peak TSH > 35 mU/L) groups.
- Monitored long-term clinical and biochemical outcomes.
Main Results:
- Mean baseline TSH was higher in the hyperresponsive group (6.8 mU/L) vs. the normal group (4.4 mU/L).
- Mean peak TSH levels significantly differed: 60.3 mU/L in the hyperresponsive group vs. 24 mU/L in the normal group.
- All evaluated infants in the normal group remained clinically and biochemically normal; 14 infants in the hyperresponsive group showed evidence of thyroid dysfunction.
Conclusions:
- TSH response to TRH stimulation is a valuable tool for evaluating infants with suspected primary hypothyroidism.
- Hyperresponsiveness to TRH may represent a form of neonatal hypothyroidism, warranting further investigation and potential treatment.