{Reference Type}: Case Reports
{Title}: An Unusual Case of Paroxysmal Third-Degree Atrioventricular Block: Thinking Outside the Box.
{Author}: Sabella-Jiménez V;Duran Luciano P;Otero-Herrera C;Espiche C;Triana AJ;Celaj S;
{Journal}: Cureus
{Volume}: 16
{Issue}: 6
{Year}: 2024 Jun
暂无{DOI}: 10.7759/cureus.62782
{Abstract}: During the assessment of a third-degree atrioventricular (AV) block in a patient with syncope, different etiologies should be considered and evaluated. Extrinsic vagal paroxysmal AV block, extrinsic idiopathic AV block and intrinsic paroxysmal AV block are among the types of third-degree AV block in the differential diagnoses. Extrinsic vagal paroxysmal third-degree atrioventricular block (EV-AVB) is linked to parasympathetic influence on cardiac conduction and can be observed in bladder distention and urinary retention. Topical and ophthalmic beta-blockers have shown systemic effects such as bradycardia with and without syncope. We present the case of an 80-year-old male with symptomatic EV-AVB likely precipitated by bladder outlet obstruction and chronic use of an ophthalmic beta-blocker, often overlooked causes of third-degree AV block.