Key result
High-density electroanatomical mapping identifies critical tachycardia isthmuses within complex post-surgical low-voltage regions.
Why the study?
Post-surgical right atrial tachycardias are complex macroreentrant arrhythmias requiring detailed mapping to identify critical isthmuses within remodeled atrial tissue.
Dual-energy lattice-tip catheter ablation and high-density electroanatomical mapping may be utilized for addressing complex macroreentrant atrial tachycardias following open-heart surgery.
Detailed mapping essential in post-surgical AT; leaves open optimal ablation strategies for complex scar-related circuits.
Atrial tachycardias (ATs) occurring late after open-heart surgery are usually macroreentrant and reflect the interaction between surgical scars, atrial remodeling, and fixed anatomical barriers.1,2 Although cavotricuspid isthmus (CTI)-dependent atrial flutter is among the most common mechanisms, prior atriotomy, patch repair, valve surgery, or surgical maze lesions may create protected channels and slow-conduction isthmuses within the right atrium.1,3 Accordingly, detailed high-density electroanatomical mapping is essential to define the tachycardia circuit and identify the critical isthmus embedded within complex low-voltage regions.
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Nishi et al. (2026) studied Post-Surgical Right Atrial Tachycardias. Dual-Energy Lattice-Tip Catheter Ablation was evaluated. Detailed high-density electroanatomical mapping is essential to define tachycardia circuits and identify critical isthmuses embedded within complex low-voltage regions post-cardiac surgery.
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