Key result
Treatment with thyroxine replacement and aspirin in a hypothyroid patient with atrial fibrillation resulted in a return to sinus rhythm at four months.
Case Report (n=1)
This letter emphasizes that both hyperthyroidism and hypothyroidism are associated with atrial fibrillation.
Sir,—We read with interest in the editorial by Forfar1 that both clinical and subclinical hyperthyroidism are associated with the subsequent development of atrial fibrillation. The association of hypothyroidism with atrial fibrillation is less recognised.2 3 For example, the Canadian Registry of Atrial Fibrillation Investigators4reported that 1.5% of 726 patients with atrial fibrillation had hypothyroidism over a period of 1.7 years. However, Tajiri et al reported that up to 8% of the 75 elderly patients with atrial fibrillation (mean age 75.6 years) studied were found to be hypothyroid, following a thyrotropin releasing hormone …
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Wong et al. (1997) conducted a case report in Atrial fibrillation and hypothyroidism (n=1). Thyroxine replacement and aspirin was evaluated on Heart rhythm. Treatment with thyroxine replacement and aspirin in a hypothyroid patient with atrial fibrillation resulted in a return to sinus rhythm at four months.
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