A 35-year-old man with recurrent palpitations undergoes electrophysiology study. During tachycardia, the earliest retrograde atrial activation is at the coronary sinus ostium, and the VA interval is 80 ms. Which single feature best distinguishes orthodromic AVRT (using the accessory pathway anterogradely) from antidromic AVRT (using the accessory pathway anterogradely)?

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