Figure 1 IGEM of a patient with RBBB after LBBP at 25 mm/s. A:Intrinsic RBBB pattern, a morphology of typical cRBBB, with the QRS
duration of 144msec, rSR’ pattern in leads V1 wide and slurred S wave in
leads V6 and I. B: LBBP with the qR pattern in V1 but
significantly narrower QRS duration of 112ms. IGEM = intracardiac
electrocardiogram, RBBB = right bundle branch block, LBBP = left bundle
branch pacing, cRBBB = complete right bundle branch block.