“… 7 Prior reports have demonstrated the utility of an EAM to identify areas of the highest voltage in patients with congenital heart disease. 8 , 9 Here, in conjunction with a multipolar mapping catheter, we were able to use an EAM to quickly and precisely target a small portion of the highly diseased atrium in which pacing was likely to be successful. This resulted in good sensing and threshold measurements, which have persisted into short-term follow-up.…”