High‐density mapping of de novo focal atrial tachycardias using a new software: Protected low‐voltage areas by zones of conduction delay

Figures

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  FIGURE 1. Left: Electroanatomical map showing an area (3.9 cm2) of low‐amplitude (<0.5 mV) bipolar signals at the earliest activation site. Right: Isochronal map demonstrating the earliest activation site, the zone of conduction block (white lines), and the preferential conduction canal (arrow) in a microreentrant focal AT arising from the left atrial septum. Low‐amplitude fractionated bipolar signals covering ≥70% of the tachycardia cycle length were recorded at the earliest activation site (p: signals recorded from the multipolar catheter at the earliest activation site; CS: signals recorded from coronary sinus catheter)

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  FIGURE 2. Left: Electroanatomical map showing a small area (1.3 cm2) of low‐amplitude (<0.5 mV) bipolar signals at the earliest activation site. Right: Isochronal map demonstrating the earliest activation site, the zone of conduction block (white lines), and the preferential conduction channel (arrow) in a case of triggered activity focal AT originating from the crista terminalis. Low‐voltage fractionated bipolar signals were recorded at the earliest activation site (p: signals recorded from the multipolar catheter at the earliest activation site)