#1707428 Thyrotoxicosis Associated with Sinus Node Dysfunction and Pulseless Arrest

Hyperthyroidism is commonly associated with cardiovascular complications such as sinus tachycardia and atrial fibrillation, while bradyarrhythmias are more commonly associated with hypothyroid states. Conduction disturbances such as sinus node dysfunction are rarely observed in hyperthyroidism and can be difficult to diagnose due to the use of negative chronotropic medication in hyperthyroid patients. Timely identification of sinus node dysfunction in patients with hyperthyroidism is important to prevent further complications such as sinus pause and arrest and avoid unnecessary pacemaker placement in patients that could otherwise be medically managed.