Diagnosed with paroxysmal AFib in 2021 (in A&E), was on 75mcg Levo and 10mcg Liothyronine (not converting well from T4 to T3) Was doing ok with ranges of FT4 around 15 -17(12-22), FT3 around 5.2 -5.9 (3.1-6.8) and a suppressed TSH of around 0.1 – 0.005 (0.27-4.2).
Was advised to drop T3 to 5mcg after 4th episode of AFib in October 2023 by A&E doctor and Endocrinology registrar (not my Endo, although same NHS hospital). My Endo was not convinced that I was overmedicated on past test results.
After more AFib episodes (every 3 months) was advised to drop T4 which I did. Subsequent testing showed that my FT4 and FT3 levels have dropped, my TSH is rising and I have the old, well known, symptoms coming back. Weight gain (5kg), hair thinning, brittle nails, carpal tunnel symptoms, lunchtime fatigue, etc.
Between October 23 and April 24 my levels have changed ,
TSH from 0.0035 to 3.05, FT4 from 17.5 to 13.1 FT3 from 5.7 to 3.4
I think the drop in FT3 gives me all the symptoms and I would like to put up the T3 dose.
My endo agrees that I need to put up my hormone replacements but wants me to put up my T4 but I feel, because I have had problems with palpitations ever since I started T4 some 45 years ago and I don’t convert well, I would rather go back on 10mcg T3. I feel my weight, like on several occasions before when I was undermedicated, will go up indefinitely and the TSH will keep going up as well.
Anybody any suggestions which one is better to put up – T4 or T3?