17 beta oestradiol does not attenuate the response to angiotensin I and II during long term therapy in postmenopausal women

PS Jhund, N Dawson, AP Davie, J Norrie, KPJ O'Kane, JJV McMurray*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: It is thought that oestrogen replacement therapy may reduce the conversion of angiotensin I to angiotensin II in postmenopausal women by inhibiting angiotensin converting enzyme. We sought to determine the effects of 3 months oestrogen replacement therapy (ERT) on the response to angiotensin I and II in postmenopausal women.

Methods: Eighteen postmenopausal women were randomised to either three months of 2 mg oral oestradiol or placebo in a double blind, placebo controlled, protocol. Change in forearm blood flow (FBF), in response to brachial arterial infusion of increasing concentrations of angiotensin I and angiotensin II was measured, pre-randomisation, after 1 months randomised therapy and after 3 months therapy, using venous occlusion plethysmography.

Results: Oestrogen treatment had no effect on baseline FBF. The mean (SD) peak reductions in FBF with 64 pmol/min angiotensin I pre-randomisation, after 1 month and after 3 months treatment with placebo were 62(11), 65(15) and 57(8)%. The corresponding reductions with the peak dose of angiotensin II (16 pmol/min) were 53(8), 48( 12) and 47(11)%. In the oestradiol group, the peak responses to angiotensin I were 56( 8), 53( 11) and 44( 29)% pre-randomisation, after 1 months treatment and after 3 months treatment. The corresponding reductions in response to angiotensin II were 37( 15), 47( 15) and 45( 19)%. Oestradiol did not affect the response to either angiotensin I or angiotensin II.

Conclusion: This study does not support the idea that ERT might exert a cardioprotective effect through inhibition of the renin-angiotensin system.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalCardiovascular Drugs and Therapy
Volume18
Issue number1
Publication statusPublished - Jan 2004

Keywords

  • arteries
  • angiotensin I
  • angiotensin II
  • hormones
  • women
  • CORONARY-HEART-DISEASE
  • ESTROGEN REPLACEMENT THERAPY
  • INDUCED VASOCONSTRICTION
  • PLUS PROGESTIN
  • HEALTH
  • TRIAL
  • NOREPINEPHRINE
  • ARTERIES
  • FAILURE
  • RISK

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