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Figure 1 Episode of a wide complex tachycardia with a right bundle branch block (RBBB) configuration, which spontaneously changes to a narrow complex SVT in the presence of a slight decrease in cycle length. Please note that the retrograde P wave is seen slightly after the QRS complex (pseudo r' wave in lead V1 and the pseudo s wave in leads II, III, and aVF (*), which suggest typical atrioventricular (AV) nodal re‐entrant tachycardia.
