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Pituitary Hormones During the Menopausal Hot Flash

Eighteen postmenopausal women with severe hot flashes had continuous recordings of finger temperature and skin resistance as objective indexes of flushing episodes, and serial measurements of anterior pituitary hormones as indirect indexes of hypothalamic neurotransmitter activity. Significant increases of growth hormone, adrenocorticotropic hormone (ACTH), and luteinizing hormone (LH) occurred with maximal concentrations at 30, five, and 15 minutes, respectively, after the onset of the skin temperature rises. No significant fluctuations of prolactin (PRL), thyroid-stimulating hormone (TSH), or follicle-stimulating hormone (FSH) were observed. The mean serum cortisol concentration increased 15 minutes after the hot flash, presumably consequent to the preceding elevation of ACTH. Pituitary ACTH release may be secondary to hypothalamic cooling, whereas increased growth hormone and LH output and the thermoregulatory adjustments comprising the flushing episodes are all consistent with cyclic episodes of increased hypothalamic norepinephrine activity.