Eligibility of cardiac resynchronization therapy patients for subcutaneous implantable cardioverter defibrillators

The eligibility for subcutaneous implantable cardioverter-defibrillators (S-ICD) was assessed among patients already implanted with cardiac resynchronization therapy (CRT). We included 20 patients (15 men, age 73 ± 10 years, LVEF 35 ± 10%). Seventeen (85%) patients were eligible for S-ICDs: 11 (55%) patients on only 1 vector and 6 (30%) patients on 2 or 3 vectors. Patients who were eligible on 2–3 vectors had narrower paced QRS than patients who were not eligible or were eligible on only one vector (133 ± 18 ms vs 167 ± 17 ms, p = 0.007). If necessary, S-ICD implantation could be considered in most patients with CRT.