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Figure 4 The intervals separating the two components of double potentials (DP1-2) recorded along the ablation line during coronary sinus pacing before and after complete block in the cavo-tricuspid isthmus are shown. Also depicted are the mean values ± SD. Note that a DP1-2 interval <90 ms was always associated with incomplete block and a DP1-2 interval  110 ms was always associated with complete block. Although there were 30 patients in this study, the sample size during incomplete block was 25 patients, because a DP was not always present during incomplete isthmus block.
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