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Complex atrial reentrant circuits evaluated by entrainment mapping using a multielectrode basket catheter.
Kunihiro Nishida1, Akira Fujiki, Hidehiko Nagasawa
1The Second Department of Internal Medicine and Toyama Medical and Pharmaceutical University, Japan.
Summary
This study shows how entrainment mapping with a basket catheter can identify complex dual-loop atrial reentrant circuits after heart surgery. Ablation successfully eliminated these circuits, improving patient outcomes.
Area of Science:
- Electrophysiology
- Cardiac Surgery
Background:
- Atrial tachycardias (ATs) are a known complication following open heart surgery, often presenting with intricate reentrant circuits.
- Mitral valve replacement surgery can predispose patients to complex atrial arrhythmias.
Observation:
- A patient with a dual-loop atrial reentrant circuit post-mitral valve replacement was studied.
- Entrainment mapping using a multielectrode basket catheter was employed to analyze the circuit.
- Atrial electrograms were recorded from various locations, including septal areas, crista terminalis, free wall, and tricuspid annulus.
Findings:
- Entrainment mapping successfully identified a dual-loop reentry circuit.
- One loop involved the tricuspid annulus, while the other encircled the septal atriotomy scar.
- Targeted ablation eliminated both reentrant circuits: one between the septal incision and inferior vena cava, and another linear ablation between the tricuspid annulus and inferior vena cava.
Implications:
- Multielectrode basket catheter entrainment mapping is a valuable tool for diagnosing complex atrial reentrant circuits.
- This technique facilitates precise ablation strategies for treating post-surgical atrial tachycardias.
- Successful ablation of dual-loop circuits offers a potential for improved management of refractory atrial arrhythmias.