LETTER TO THE EDITOR
Double potentials analysis as a guide to radiofrequency ablation of atrial flutter: Reply
Fred Morady, MDa and
Hiroshi Tada, MDa
a Division of Cardiology, B1F245, 1500 East Medical Center Drive, Ann Arbor, Michigan 48109-0022 USA
fmorady{at}umich.edu
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 (DP1–2 interval) that does not have any gap. These variables account for the wide range of DP1–2 intervals found after complete isthmus block was achieved (95 to 198 ms) (1). Nevertheless, we continue to believe that a DP1–2 interval  110 ms is strongly associated with complete isthmus block. The pacing site certainly affects the DP1–2 interval, and our data apply only to proximal coronary sinus pacing.
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1. Tada H, Oral H, Sticherling C, et al. Double potentials along the ablation line as a guide to radiofrequency ablation of typical atrial flutter. J Am Coll Cardiol. 2001;38:750–755[Abstract/Free Full Text]
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