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- W2036287524 abstract "Most postinfarct ventricular tachycardias (VTs) are sustained by a reentrant mechanism. The protected isthmus of the reentrant circuit is critical for the maintenance of VTs and the target for catheter ablation. Various techniques based on conventional electrophysiology and/or detailed three-dimensional (3D) reconstruction of the VT circuit are used to unmask this isthmus.The purpose of this study was to assess pace-maps (PMs) to identify postinfarct VT isthmuses. We hypothesized that an abrupt change in paced QRS morphology may be used to identify a VT isthmus and be targeted for successful ablation.High-density 3D PMs were matched to the subsequent 3D endocardial reentrant VT activation mapping in 10 patients (8 men; age 70.7 ± 10.8 years) who underwent successful postinfarct VT ablation. At each pacing site in a given patient, the 12-lead ECG recorded during pacing was compared to that of VT, with the resulting matching percentage (up to 100% for perfect matches) allocated to this point to generate color-coded PMs.With respect to VT isthmuses, the best percentages of matching were found in the exit zones and isthmus exit part (89% ± 8% and 84% ± 7%, respectively) and the poorest adjacent to scar border in the outer entrance zones (23% ± 28%), in the entrance zones (39% ± 34%), and in the entrance part of the isthmus (32% ± 26%). The color-coded sequence (from the best to the poorest matching sites) on the PMs revealed figure-of-eight pictures matching the VT activation time maps and identifying VT isthmuses.Pace-mapping is useful for unmasking VT isthmuses in patients with well-tolerated postinfarct endocardial reentrant VTs." @default.
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- W2036287524 date "2014-02-01" @default.
- W2036287524 modified "2023-10-16" @default.
- W2036287524 title "Localizing the critical isthmus of postinfarct ventricular tachycardia: The value of pace-mapping during sinus rhythm" @default.
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- W2036287524 doi "https://doi.org/10.1016/j.hrthm.2013.10.042" @default.
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