ArticleJournal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing2023
Intracardiac electrogram characteristics of intramural outflow tract ventricular arrhythmias.
Article in Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Characteristics of Bipolar and Unipolar Electrograms at Optimal Ablation Sites for Ventricular Arrhythmias Originating Near the Left Ventricular Summit.Journal of the American Heart Association · 2026Article
- The value of microelectrodes and microbipolar electrograms in premature ventricular complex mapping and ablation: The micro-PVC study.Heart rhythm O2 · 2026Article
- Differences Between the Unipolar Versus Bipolar Potential-Based Activation Maps of Ventricular Premature Contractions Arising From Ventricular Outflow Tracts.Journal of cardiovascular electrophysiology · 2025Article
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13 authors.
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Abstract
backgroundAnnotation of earliest depolarization which depends on maximum dV/dt of unipolar-electrograms and unipolar QS morphology identify site of origin for ventricular premature contractions (VPC). However, identification of unipolar QS morphology has limitations due to low spatial resolution. This study aims to compare electrogram characteristics at successful ablation site in patients with outflow tract (OT) VPC.
methodsLocal activation time (LAT), duration, and voltage data of each bipolar- and unipolar-electrogram at the successful ablation sites from the right ventricle OT (RVOT) and the left ventricle OT (LVOT) cases were analyzed.
resultsForty-four of 60 (73%) of patients were ablated from RVOT and in 16/60 (27%) required ablation from both sides. All patients had acute VPC suppression. Bipolar-electrogram-QRS onset was earlier (36.4 ± 14.5 ms vs 26.3 ± 7.4 ms, p = 0.01), duration of bipolar-electrogram was shorter (56.9 ± 18.9 ms vs 78.9 ± 21.8 ms, p = 0.002), and bi-voltage amplitude was higher (3.2 ± 2.3 mV vs 1.4 ± 1.1 mV, p = 0.07) for patients with RVOT-only ablation. Mean bipolar-unipolar-electrogram difference was 4.4 ± 4.5 ms in the RVOT group vs 12.8 ± 4.9 ms in RVOT + LVOT group (p < 0.001). Unipolar QS morphology was recorded in 3.0 ± 3.9 vs 3.6 ± 1.8 cm
conclusionQS in unipolar-electrogram was not a perfect predictor for successful ablation sites. Analysis of bipolar voltage amplitude and duration with bipolar-unipolar-electrogram time difference may identify presence of a deeper source.
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