Abstract
Atrial arrhythmias after heart transplantation are common and usually originate from reentrant circuits inside the donor and recipient atria. Acase is presented of macroreentrant atrial tachycardia with areentry circuit incorporating preserved electrical conduction from the donor and recipient right atria. An invasive electrophysiological study including high-density electroanatomical mapping with amultipolar catheter was performed during tachycardia. Areentry circuit with an area of slow conduction at the supero-lateral aspect of the surgical anastomosis could be demonstrated. Catheter ablation at the site of slow conduction successfully terminated and permanently suppressed the tachycardia.
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