Complete Heart Block in Thyrotoxicosis, Is It a Manifestation of Thyroid Storm? A Case Report and Review of the Literature

License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Thyrotoxicosis complicated by advance degree atrioventricular block, a rare complication of a common disease. The term apathetic thyrotoxicosis, where palpitations and cardiac involvement are the sole manifestations of disease, is well known. Thyroxin’s ability to sensitize the catecholamine receptors causing tachyarrhythmias is well addressed. However, as an aetiology for advanced heart block, thyrotoxicosis is ranked as one of the rarest. 1. Case Presentation Mrs. T.R.M. is a 37-yr-old Egyptian woman who presented with a history of shortness of breath, palpitations, and recurrent syncope that had lasted three days. The patient has been thyrotoxic for the last 10 years with erratic follow-up appointments and poor adherence to her treatment program. At presentation, she had progressive shortness of breath that had been occurring for the past 3 days and wa