Left Septal Fascicular Block Following Left Bundle Branch Area Pacing

Left bundle branch area pacing (LBBAP) is a type of conduction system pacing wherein the left bundle branch and/or the left side of the interventricular septum are stimulated with a permanent pacing lead to maintain physiological electrical activation of the left ventricle. As understanding grows regarding trifascicular activation in the left ventricle and left septal fascicular block (LSFB), there is an indication that new electrocardiographic alterations may emerge, particularly in instances of arterial occlusions. Here, we present a case study delineating LSFB subsequent to LBBAP.