“…The rate of ineligibility observed in this study for both right-and left-sided S-ICD in ACHD patients (40%) is higher than the rate reported by Alonso et al 23 for tetralogy of Fallot (23%) and mixed ACHD patients 13 (25%), the rate reported by Okamura et al (12%) 24 , Garside et al 6 (25%; left-sided only), and Zeb et al 25 (13%; left-sided only). Higher rate of S-ICD ineligibility in our study can be due to the large size, greater complexity and heterogeneity, and more severe functional impairment of our study population.…”