We compared the results of conventional electroanatomic mapping and high-density mapping in ablations of the right ventricular outflow tract.

Between 2014 and 2024, a total of 92 patients underwent ablation using an electroanatomic mapping system. A contact force radiofrequency ablation catheter was used in all patients, except for two who underwent cryoablation.

Our study comprised two groups, with a total of 92 patients. Among them, 45 patients underwent conventional three-dimensional mapping, while 47 patients underwent high-density three-dimensional mapping. In both groups, there were three patients with nonsustained ventricular tachycardia and two patients with sustained ventricular tachycardia, and there was no statistically significant difference in the frequency of ventricular premature contractions between the two groups. There were four patients with systolic dysfunction in the high-density mapping group and four in the conventional mapping group. In the high-density mapping group, the procedure time was significantly shorter. There was a notable difference regarding the reduced fluoroscopy time. The total lesion time and number were also significantly lower in the high-density mapping group. The earliest activation time was significantly longer in this group. The procedure’s success rate was 97.9% for the high-density mapping group and 93.4% for the conventional mapping group. Successful ablation was performed on one ventricular extrasystole in the parahisian localisation in each group, while a cooled type radiofrequency catheter was used for all other cases.

In children with right ventricular outflow tract arrhythmias, high-density mapping can be used with high success rates and safety.