Figure 2 From the left to the right column, ECG strips (above) and subcutaneous implantable cardioverter-defibrillator (s-ICD) vector strips (below) of spontaneous QRS, non-selective His-Bundle-paced (HBP) QRS, left ventricular (LV)-paced QRS in the configuration LV1-LV2 (final configuration chosen for programming), and His-Optimized Cardiac Resynchronization Therapy, i.e. biventricular HBP + LV paced QRS (with a delay of 20 msec between HBP and LV pacing), respectively. As shown in the s-ICD vector strips below, the paced QRS complex was correctly identified by the s-ICD in all above-mentioned configurations.