CTI ablation data
Thirty-nine patients were ablated during SR at baseline while 22 were
ablated in common flutter. PVI was performed concomitantly in 28
patients. CTI block was achieved in all patients but one. Baseline PR
interval was measured in 52 patients as 9 patients had already complete
block when back to SR. All patients had PR measurement after CTI
ablation.
A shown in Table 2, lateral delay and delta PR interval significantly
increased after validation of CTI block (from 257±42 ms to 318±50 ms and
32±23 to 96±22 ms, respectively, p<0.0001,).
Finally, a ROC curve was performed to obtain the best cut-off of delta
PR interval to predict CTI block. A delta PR interval ≥ 70 ms was the
best predictor with an AUC of 1. As highlighted in Figure 3, all
patients, in whom CTI block was confirmed with the standard method, had
a delta PR interval greater than 70 ms (range 71-152 ms), while no
patient without CTI block could reach this value (range: 0-68ms) ,
yielding a sensitivity and specificity of 100% to predict CTI block.