Use of the inverse solution guidance algorithm method for RF ablation catheter guidance

Area of Science:

• Cardiology
• Biomedical Engineering
• Medical Physics

Background:

• The inverse solution guidance algorithm (ISGA) uses a Single Equivalent Moving Dipole model for cardiac electrical activity.
• ISGA aims to localize re-entrant circuit exit sites and radiofrequency (RF) ablation catheter tips.

Purpose of the Study:

• To investigate the efficacy of the ISGA for guiding ablation catheters in an animal model.
• To assess ISGA's accuracy in localizing ventricular tachycardia (VT) origins.

Main Methods:

• Ventricular tachycardia was simulated in eleven Yorkshire swine using rapid ventricular pacing.
• Three target localization techniques were used: pacing lead (Type-1), mapping catheter (Type-2), and random RF catheter (Type-3).
• One operator placed the target, while another used ISGA to guide the RF ablation catheter from a random position.

Main Results:

• The average localization error for the RF ablation catheter tip was 0.31 ± 0.08 cm.
• ISGA achieved target localization accuracy of 0.4 cm (Type-1), 0.48 cm (Type-2), and 0.67 cm (Type-3) after multiple catheter movements.
• The system demonstrated accuracy within approximately 35 cardiac cycles of simulated VT.

Conclusions:

• The ISGA method is feasible for guiding ablation catheters to VT origins.
• This approach successfully localized VT foci using body surface potentials without requiring electro-anatomic mapping.