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We thank Dr. Turco and colleagues for their comments. We agree that there are several variables that may affect the interval separating the two components of double potentials recorded along an isthmus ablation line (DP1–2interval) that does not have any gap. These variables account for the wide range of DP1–2intervals found after complete isthmus block was achieved (95 to 198 ms) (1). Nevertheless, we continue to believe that a DP1–2interval ≥110 ms is strongly associated with complete isthmus block. The pacing site certainly affects the DP1–2interval, and our data apply only to proximal coronary sinus pacing.
- American College of Cardiology Foundation