Syncope is a frequently encountered condition in the emergency room, with vagal syncope being the most prevalent form. However, overlapping symptoms can pose diagnostic challenges when distinguishing between vagal syncope and symptomatic sinus node dysfunction. A comprehensive history and careful evaluation of hemodynamics and electrocardiogram findings are crucial for accurate differentiation. Vagal syncope is typically associated with an upright posture, and supine syncope is considered atypical. In this case report, we describe an intriguing instance of supine vagal syncope, highlighting the importance of correct diagnosis to avoid unnecessary pacemaker implantation.
