Occult thyrotoxicosis in patients with chronic and paroxysmal isolated atrial fibrillation

摘要: Thyroid function tests, including thyrotropin releasing hormone administration (TRH), were performed in 40 consecutive patients with isolated atrial fibrillation (IAF) (i.e., without any other evidence of cardiac disease). The arrhythmia was chronic 5 and paroxysmal 35 patients. Thyrotoxicosis could not be diagnosed either clinically or by abnormal serum levels T4, T3, T3 BC, thyroid stimulating (TSH). response to TRH, which normal patients, absent (12.5%) who considered have occult thyrotoxicosis. One had the 4 IAF. did recur after antithyroid treatment these four sinus rhythm a mean follow-up period 21 months. Full exploration therefore seems useful only IAF, but also those affected form.