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Mapping and ablation of ventricular tachycardia guided by virtual electrograms using a noncontact, computerized
S A Strickberger1, B P Knight, G F Michaud
1Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor 48109-0022, USA.
Journal of the American College of Cardiology
|February 17, 2000
Summary
This study introduces a computerized mapping system using a noncontact catheter for virtual electrograms, proving useful for ventricular tachycardia (VT) ablation. The system accurately maps VT circuits and guides ablation, improving patient outcomes.
Area of Science:
- Electrophysiology
- Cardiovascular Imaging
- Medical Device Technology
Background:
- Conventional ventricular tachycardia (VT) mapping in electrophysiology labs is time-consuming, requiring sequential catheter positioning.
- This limits real-time, comprehensive endocardial data acquisition during VT.
Purpose of the Study:
- To describe a novel computerized mapping system for ventricular tachycardia (VT) using a noncontact catheter.
- To assess the clinical utility of this system for mapping and ablating VT.
- To compute virtual electrograms at numerous left ventricular (LV) sites simultaneously.
Main Methods:
- A 64-electrode balloon catheter was used to compute 3,360 virtual electrograms and derive isopotential maps.
- A boundary element inverse solution was employed for virtual electrogram computation.
- A locator system aided conventional catheter positioning for ablation.
Main Results:
- The system successfully mapped 21 VTs, identifying critical elements like slow conduction zones and exit sites.
- Virtual electrograms and isopotential maps facilitated identification of VT substrates.
- Radiofrequency ablation guided by the system achieved a 79% success rate (15 of 19 targeted VTs).
Conclusions:
- The computerized mapping system provides accurate isopotential maps.
- These maps are valuable for guiding radiofrequency ablation of both hemodynamically stable and unstable VT.
- This technology offers a more efficient approach to VT mapping and ablation.