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Pituitary hormones during the menopausal hot flash.
Obstetrics and Gynecology
|December 1, 1984
Summary
Hot flashes in postmenopausal women are linked to hormonal changes. Increased norepinephrine activity in the hypothalamus may trigger hot flashes and associated pituitary hormone releases like ACTH, LH, and growth hormone.
Area of Science:
- Neuroendocrinology
- Reproductive Medicine
- Thermoregulation
Background:
- Hot flashes are a common symptom of menopause, significantly impacting quality of life.
- The neurobiological mechanisms underlying hot flashes, particularly the role of hypothalamic neurotransmitters, remain incompletely understood.
Purpose of the Study:
- To investigate the relationship between objective measures of hot flashes and anterior pituitary hormone secretion.
- To explore the potential role of hypothalamic neurotransmitter activity in the pathophysiology of hot flashes.
Main Methods:
- Continuous monitoring of finger temperature and skin resistance in 18 postmenopausal women experiencing severe hot flashes.
- Serial measurements of anterior pituitary hormones (growth hormone, ACTH, LH, PRL, TSH, FSH) and serum cortisol.
Main Results:
- Significant increases in growth hormone, adrenocorticotropic hormone (ACTH), and luteinizing hormone (LH) were observed following hot flashes.
- Cortisol levels rose 15 minutes post-hot flash, correlating with ACTH elevation.
- No significant changes in prolactin, TSH, or FSH were detected during hot flashes.
Conclusions:
- Hot flashes are associated with specific patterns of pituitary hormone release, including ACTH, LH, and growth hormone.
- Hypothalamic cooling may trigger ACTH release, while increased norepinephrine activity is implicated in hot flashes and associated hormonal changes.