“…[6][7][8][9] In these patient populations, a variety of innovative approaches to ICD implantation have been reported, including subcutaneous, epicardial and caval electrode placements and/or abdominal can implants (Figure 1). [7][8][9][10][11][12] Employing ad hoc adaptations of existing ICD components, these approaches attempt to minimize system invasiveness, incorporate patient specific options to adapt to complex anatomy, and achieve low defibrillation thresholds. Assumptions of efficacy are based on extrapolation of data from the use of subcutaneous arrays in adults, limited animal research and post-implantation assessment of defibrillation thresholds.…”