Dual Atrioventricular Nodal Non-Re-Entrant Tachycardia.

ABSTRACT

A patient presented with symptoms of palpitations. Her standard 12-lead electrocardiogram captured 3 potential causes of her symptoms (premature atrial contractions, junctional rhythm, and narrow complex tachycardia). Further workup uncovered dual atrioventricular node physiology with 12 sinus conduction and resultant alternating QRS from a slow and fast conduction pathway. (Level of Difficulty Intermediate.).