case_images: PMC10829413_01
case_images: A: Twelve-lead electrocardiogram showing atrial sensed and ventricular pacing @ 85 bpm. The paced QRS duration is 148 ms. B: Twelve-lead electrocardiogram recorded after cardiac resynchronization therapy upgrade with a paced QRS duration of 117 ms.
case_images: icrm-15-5735-g001.jpg
case_images: PMC10829413_01_icrm-15-5735-g001.jpg
case_images: fg001
case_images: Both paced dual-chamber and CRT electrocardiograms are shown in Figure 1.
case_images: PMC10829413_02
case_images: PMC10829413_03