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Circadian changes in pulsatile TSH release in primary hypothyroidism.

R Adriaanse1, G Brabant, K Prank

  • 1Department of Endocrinology, University of Amsterdam, The Netherlands.

Clinical Endocrinology
|December 1, 1992
PubMed
Summary

Thyroid-stimulating hormone (TSH) pulse amplitude is higher in hypothyroidism, while pulse frequency remains stable. The typical nighttime TSH surge is diminished in overt hypothyroidism, impacting pulse amplitude and frequency.

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Area of Science:

  • Endocrinology
  • Thyroid Research
  • Hormone Secretion Dynamics

Background:

  • Primary hypothyroidism is characterized by altered thyroid hormone levels.
  • Understanding the pulsatile and circadian patterns of TSH secretion is crucial for diagnosing and managing thyroid disorders.

Purpose of the Study:

  • To evaluate the pulsatile and circadian secretion patterns of TSH in patients with primary hypothyroidism.
  • To compare TSH secretion dynamics between overt hypothyroidism, subclinical hypothyroidism, and healthy controls.

Main Methods:

  • Prospective study involving 24-hour blood sampling every 10 minutes for TSH assay.
  • Measurement of thyroid hormones and TSH responsiveness to TRH.
  • Computer-assisted analysis using Desade and Cluster programs for TSH pulse characteristics.

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Main Results:

  • Increased TSH pulse amplitude was observed in both overt and subclinical hypothyroidism compared to controls.
  • TSH pulse frequency remained consistent at approximately 10 pulses/24 hours across all groups.
  • The nocturnal TSH surge was absent in a majority of overt hypothyroidism patients, correlating with reduced nocturnal TSH pulse amplitude and frequency.

Conclusions:

  • Mean 24-hour TSH pulse amplitude is elevated in primary hypothyroidism, irrespective of disease severity.
  • TSH pulse frequency is not significantly altered in primary hypothyroidism.
  • The diminished nocturnal TSH increase in primary hypothyroidism is linked to a loss of normal nocturnal TSH pulse amplitude and frequency patterns.