**6. Anatomical considerations for His bundle pacing**

Knowledge of anatomical and physiological properties of cardiac conduction system, and HB in particular, is required for performing successful lead

implantation for further HBP. Significant contribution to this topic was added by Kawashima T., Sasaki H. in 2005, who described relationship of the HB to the membranous part of the IVS based on the autopsy material of 105 subjects [25]. Authors outlined three anatomical variations of HB.
