Atrial fibrillation is the most com

Atrial fibrillation is the most common cardiac arrhythmia other than sinus tachycardia encountered in hyperthyroidism. Atrial fibrillation occurs in 10-15% of patients with hyperthyroidism1. It may be the presenting problem in some of them. Higher prevalence occurs in elderly and in those with other coexisting risk factors for atrial fibrillation. Low serum thyroid
stimulating hormone is an independent risk factor for development of atrial fibrillation2. Atrial fibrillation in thyrotoxicosis is associated with significant mortality and morbidity resulting from embolic events