We present the ECG with broad QRS complex tachycardia and left bundle branch block (LBBB) morphology. There are
negative P waves in inferior leads (II, III, aVF) and positive in V1 with the RP interval of 124–164 ms. The slow–slow atrioventricular nodal reentrant tachycardia (AVNRT) conducted with LBBB aberrancy was diagnosed. The differential diagnosis of
slow–slow AVNRT from atrioventricular reentrant tachycardia using concealed posteroseptal accessory pathway is discussed.
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