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Physiological doses of estradiol decrease nocturnal blood pressure in normotensive postmenopausal women.

A Cagnacci1, L Rovati, A Zanni

  • 1Institute of Obstetrics and Gynecology, University of Modena, 41100 Modena, Italy. cagnacci@unimo.it

The American Journal of Physiology
|April 13, 1999
PubMed
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Transdermal estradiol treatment in postmenopausal women significantly reduced nighttime blood pressure and restored or amplified the 24-hour blood pressure rhythm. This hormonal therapy impacts nocturnal blood pressure regulation.

Area of Science:

  • Endocrinology
  • Cardiovascular Physiology

Background:

  • Menopause is associated with alterations in cardiovascular function, including changes in blood pressure regulation.
  • Hormonal changes during menopause, particularly decreased estrogen levels, may influence circadian blood pressure patterns.

Purpose of the Study:

  • To investigate the effect of transdermal estradiol on 24-hour blood pressure rhythm in healthy, normotensive postmenopausal women.
  • To determine if estradiol influences nocturnal blood pressure decline and the overall circadian blood pressure pattern.

Main Methods:

  • A randomized, placebo-controlled study involving 18 normotensive healthy postmenopausal women.
  • Participants received either transdermal estradiol (50 microgram/day) or a placebo for 2 months.
  • 24-hour ambulatory blood pressure monitoring was used to assess blood pressure rhythm.

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Main Results:

  • Transdermal estradiol significantly reduced nighttime systolic, diastolic, and mean blood pressure.
  • Daytime blood pressure remained unchanged.
  • Estradiol amplified the nocturnal blood pressure decrement, restoring or enhancing the 24-hour blood pressure rhythm in all participants.
  • Body mass index was directly related to the amplitude of the 24-hour mean blood pressure rhythm.

Conclusions:

  • Physiological doses of transdermal estradiol effectively amplify the nocturnal decline of blood pressure in normotensive postmenopausal women.
  • Estradiol treatment can restore or improve the 24-hour blood pressure rhythm, suggesting a role in cardiovascular regulation during postmenopause.
  • These findings highlight the impact of estrogen on circadian blood pressure patterns and nocturnal hemodynamics.