that is patently wrong to state hypothyroid lowers the risk of AFIB.. Maybe if they do a cross section of people who they deal hyper versus Hypo more of the Hyper will have experienced active AFIB, but Hypothyroid very much so is associated with and can contribute to AFIB.
We have discussed the mechanisms here many times for the hypothyroid/andrenal axis contribution to arrhythmia and have shared on The AFIB Report a number of studies demonstrating the clear association of hypothyroidism and AFIB as well.
To be sure, true hyperthyroid is the more recognized and consistent trigger for AFIB, but its utterly a mistake to imply that Hypothyrodism is somehow protective against AFIB.
Certainly it is not protective relative to true Euthyroidism. A healthy functioning thyroid gland is essential as a pillar of good health. With thyroid dysfunction, whether under or over active, a myriad of organ systems and over all health suffer including many aspects of cardiovascular health.
Shannon