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A, Earliest site of ventricular preexcitation. This electrogram is recorded from the tip of the ablation catheter located in the mid portion of the left sinus of Valsalva at the junction with the aortic cusp. Activation at this site was 30 ms before onset of QRS. Maximal preexcitation was maintained with pacing from the proximal coronary sinus. B, Ablation at this site eliminated ventricular preexcitation in 3 seconds at 15 W.
