Resolution of Complete Atrioventricular Block in a Patient with Severe Hypothyroidism

Causes for syncope are multifaceted. Hormonal etiology, specifically hypothyroidism, is associated with cardiac arrhythmias [1]. Sinus bradycardia, low voltage, nonspecific T-wave changes and dissociative atrioventricular (AV) abnormalities are some of descriptive electrocardiographic features [2]. In the majority of well know clinical presentations complete AV block requires the insertion of a permanent pacemaker. However hypothyroidism related bradycardia and consequential symptomatic AV blocks could be reversible with timely and proper management. We report a case of severe hypothyroidism resulting in insertion of transient pacemaker with favorable clinical course and fully reversible complete AV block after accordant pharmacological hormonal substitution.