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While it is well known that hyperthyroidism can be a trigger of AFib, living completely without a thyroid in itself will cause it even if you are not overmedicated. I am trying to get study's on this, but most go by assumptions. An increase in AFib after thyrodectomy is documented, but then it is theorized that this is due to being overmedicated. I have been undermedicated for almost 15 years and suffer from sever AFib. Many studies linking hyperthyroidism with AFib don't look at thyroidless patients, but at people with overproducing thyroid. I found one study of labrats that were given a thyrodectomy. Some were overmedicated, some undermedicated and some were kept within range. AFib was in 76 percent of undermedicated rats and around 60 in overmedicated rats. Yet the assumption remains that if you have AFib you are overmedicated. Anybody knows of any study of actual people with total thyrodectomy that doesn't just assume that the higher incident of AFib is due to overmedication. I saw one that admits the link is there independent of TSH level.
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