Remote magnetic navigation for mapping and ablating right ventricular outflow tract tachycardia

Area of Science:

• Cardiovascular Electrophysiology
• Minimally Invasive Cardiac Procedures

Background:

• Right ventricular outflow tract (RVOT) procedures present navigation challenges.
• External magnetic fields offer potential for enhanced catheter-based cardiac procedures.

Purpose of the Study:

• To evaluate the feasibility of using remote magnetic navigation for ablation of RVOT tachycardia.

Main Methods:

• Mapping and ablation performed in eight patients with outflow tract ventricular arrhythmias.
• Utilized a basket catheter for tachycardia mapping, followed by magnetic catheter navigation and pace-mapping.
• Ablation targeted sites of perfect pace-mapping with earliest activation.

Main Results:

• Acute procedural success in all patients with a median of four applications.
• Median procedure time was 144 minutes; low fluoroscopy times for patient (13.4 min) and physician (3.8 min).
• No intra-procedural complications and one recurrence during follow-up (mean 366 days).

Conclusions:

• Remote magnetic navigation is effective for mapping and ablating RVOT tachycardias, guided by basket catheter data.
• Precise activation and pace-mapping are achievable with this technology.
• The method demonstrates potential for reduced physician radiation exposure and promising long-term efficacy.