Unusual left-sided variant orientation of the slow conduction zone in adenosine-sensitive atrial tachycardia.

Adenosine-sensitive atrial tachycardia (AT) is typically associated with a slow conduction zone (SCZ) near the atrioventricular node or tricuspid annulus. We report an unusual case of adenosine-sensitive AT with a SCZ located between the left atrial appendage and the left atrial anterior septum, which was successfully ablated 9.2 mm from the left atrial earliest activation site. This case highlights the importance of advanced mapping and entrainment techniques in the identification and management of rare left-sided SCZ variants of adenosine-sensitive AT.