Abstract
We report 3 cases of irregular, narrow complex tachycardia misdiagnosed and treated for atrial fibrillation. The adenosine response, detection of recurring triple cycle length variation patterns, and pseudo-R-wave in lead V(1) during tachycardia made us suspect typical atrioventricular nodal re-entrant tachycardia. The electrophysiology study confirmed atrioventricular nodal re-entrant tachycardia, and symptoms were resolved by slow pathway modification.