In contrast to left bundle branch pacing, the criteria for left ventricular septal pacing (LVSP) were never validated. LVSP is usually defined as deep septal deployment of the pacing lead with a pseudo-right bundle branch morphology in V1. The case report describes an implant procedure during which this definition of LVSP was fulfilled in four of five pacing locations within the septum, with the shallowest of them present in less than 50% of the septal thickness. The case highlights the need for a more precise definition of LVSP.

Cardiac Pacing Unit Cardiology Department University Hospital of Geneva Geneva Switzerland

Department of Cardiology 3rd Faculty of Medicine Charles University and University Hospital Kralovske Vinohrady Prague Czech Republic

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