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(A) The QRS complex in SR results from a fusion between AVN + LBBB conduction and left lateral AP conduction, which makes it narrower than in SR after ablation of the AP, and also narrower than in tachycardia. (B) Orthodromic AVRT with LBBB – the left lateral AP conducts retrogradely, so the QRS will be wider than in SR. (Adapted from[5]).
