@Lotusflower75 I haven't seen it, thanks for the link.
Tachyphylaxis has been associated with estradiol implants, hence the articles from countries where implant use is more widespread than in the UK.
There are no current data on tachyphylaxis with transdermal estradiol, the articles mentioned are observational.
IMHO Dr. Paula Briggs is trying to raise awareness of the issue because she has seen patients with mental symptoms who were taking high doses of HRT based on a supposed 'poor absorber' status.
Some snippets of her article 'Possible tachyphylaxis with transdermal therapy?Nikki Kersey ST1 CSRH, Paula Briggs Consultant CSRH'
'Introduction
This tale from the menopause clinic raises the possibility
of a form of tachyphylaxis with transdermal
estradiol (gel).'
'Case Study
A 47 year old woman was seen in the menopause clinic
with menopausal symptoms including:
• Altered sleep pattern
• Reduction in libido
• Vaginal dryness
• Hot flushes
• Anxiety
Her GP had initiated treatment with a continuous
combined oral HRT preparation, which initially she
responded well to. 12 months later her GP referred
her to the menopause clinic as her symptoms had
recurred, and she had also developed problematic
bleeding. She had a BMI of 26, smoked 15 cigarettes
per day, drank no alcohol and reported being happy at work and had a supportive husband at home.'
She had high levels of estradiol, 1052 pmolL on 4 pumps of Oestrogel, which dropped to 71 pmol/L 8 months after stopping it due to returning symtoms (hot flushes and night sweats).
She was also on citalopram (GP prescription before being referred to the menopause clinic).
She was given Estradot 50 after having her high BP under control.
Bottom line: A 47 year old woman is probably in perimenopause (the article doesn't say anything about her menopausal status), so the blood tests and conclusion could be explained by her own hormonal fluctuations.
That said... I think Dr Paula Briggs has a point.
Have you been following the mainstream media on the subject?
https://www.dailymail.co.uk/health/article-11927783/Is-Britains-foremost-menopause-doctor-risking-womens-lives-alarmingly-high-doses-HRT.html
https://inews.co.uk/inews-lifestyle/menopause-doctor-women-asking-prescribe-unsafe-levels-hrt-social-media-2554733
https://www.independent.co.uk/voices/menopause-hrt-drugs-social-media-b2396609.html
https://www.abc.net.au/listen/programs/lifematters/dr-louise-newson-wants-to-change-the-way-we-treat-menopause/102099014
Newson's clinic has treated some women with very high doses of estrogen and apparently does not always prescribe the 'adequate' amount of progestogen.
I have no idea what the 'adequate' amount of progestogen is if you are taking more than the licensed amount of estradiol.
This is a minefield, as we all know, because many women love estrogen (recently called an 'elixir' in the Daily Mail) but hate the progesterone part of HRT.
This issue is very polarised at the moment (like everything these days) and my humble advice to women taking high doses of estradiol (in fact, I don't like the idea of a 'top up' with gel for patch users, but that's for another post ) is to monitor the endometrium more frequently and perhaps try another regimen rather than just increasing the oestrogen dose.
P.S. I will ask Dr Paula Briggs if her patient was given Oestrogel or Oestrodose! Maybe that could have been the cause of her returning symptoms...