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Bundle branch block is your friend for pathway localization

      A 49-year-old healthy woman presented with a narrow, regular complex, short RP tachycardia. Her baseline electrocardiogram showed ventricular pre-excitation (Supplemental Figure 1). How do the data shown in Figure 1 help in localizing the AP?
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      Figure 1A: Orthodromic tachycardia with ventriculoatrial (VA) interval measuring 75 ms. B: Tachycardia with right bundle branch block morphology having VA interval of 103 ms.

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