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Catheter ablation for hemodynamically unstable monomorphic ventricular tachycardia.
K E Ellison1, W G Stevenson, M O Sweeney
1Cardiovascular Division, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.
Journal of Cardiovascular Electrophysiology
|March 1, 2000
Summary
Catheter ablation targeting scar regions during sinus rhythm is feasible for treating poorly tolerated ventricular tachycardia (VT). This approach successfully eliminated VT recurrences in most patients, offering a new treatment option.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Hemodynamic instability often limits extensive catheter mapping for ventricular tachycardia (VT) in heart disease patients.
- Identifying focal targets for ablation during VT is challenging due to patient instability.
Purpose of the Study:
- To assess the feasibility of catheter ablation for poorly tolerated VT by targeting regions identified during sinus rhythm.
- To evaluate a novel strategy for VT ablation in patients unsuitable for traditional mapping.
Main Methods:
- Five patients with severe, poorly tolerated VT underwent ablation targeting specific regions identified during sinus rhythm.
- Target regions were characterized by slow conduction (fractionated electrograms, stimulus-QRS delay) and presumptive VT exit during pace mapping.
- Radiofrequency ablation lesions were applied to the identified target regions.
Main Results:
- Ablation was attempted in 4 of 5 patients, with successful identification of target regions.
- VT recurrences were abolished in 3 of these 4 patients during a 14-22 month follow-up period.
- No complications were reported during the procedures.
Conclusions:
- Catheter ablation targeting identifiable scar with abnormal conduction during sinus rhythm is a feasible strategy for managing poorly tolerated VT.
- This approach may provide an alternative for patients with VT who cannot tolerate extensive mapping during tachycardia.