Supraventricular Tachycardia: Where to Ablate?

Area of Science:

• Cardiology
• Electrophysiology
• Medical Case Reports

Background:

• Typical atrioventricular nodal reentrant tachycardia (AVNRT) is a common supraventricular tachycardia.
• Standard treatment involves radiofrequency ablation targeting the slow pathway in the right atrium.
• Atypical presentations may require alternative ablation strategies.

Purpose of the Study:

• To present a case of AVNRT with eccentric atrial activation successfully treated by ablation within the coronary sinus.
• To highlight the importance of considering alternative ablation sites when standard approaches are ineffective.

Main Methods:

• Case report of a patient with drug-refractory typical AVNRT.
• Electrophysiological study to map atrial activation and identify tachycardia mechanism.
• Radiofrequency ablation targeting the slow pathway, with successful ablation within the coronary sinus.

Main Results:

• The patient exhibited typical AVNRT with eccentric retrograde atrial activation.
• Successful termination of tachycardia was achieved by ablation within the coronary sinus.
• This site targeted left posterior nodal extensions.

Conclusions:

• Ablation within the coronary sinus can be an effective strategy for AVNRT when standard right-sided approaches fail.
• Left posterior nodal extensions in the coronary sinus or over the mitral annulus are important targets.
• This case underscores the need for individualized ablation strategies in complex supraventricular tachycardia cases.