ArticleHeart rhythm O22026
The value of microelectrodes and microbipolar electrograms in premature ventricular complex mapping and ablation: The micro-PVC study.
Article in Heart rhythm O2, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Background: Catheter ablation is an effective treatment for premature ventricular contractions (PVCs). Mapping typically relies on bipolar (bip-EGMs) and unipolar electrograms (uni-EGMs). Recently, catheters equipped with microbipolar electrodes have become available. Objective: This study aimed to investigate the value of microbipolar EGMs (micro-EGMs) in PVCs mapping. Methods: We performed a multicenter retrospective study including patients who underwent successful outflow tract PVC ablation using QDOT catheters. 2 groups were identified based on the superficial or intramural origin of the PVC. EGMs-bip-, uni-, and micro-EGMs-were assessed at the successful ablation sites. The primary outcome was the ability of micro-EGM to discriminate between superficial and intramural PVCs. The secondary outcome was signal amplitude. Results: Among 81 patients (mean age 54 ± 11 years; 59.3% male), 51 had superficial and 30 had intramural PVCs. In superficial PVC, micro-EGM preceded both uni-EGM and bip-EGM in 90% of cases. In particular, when the earliest bip-EGM preceded the earliest micro-EGM by >10 ms (Δ Conclusion: Micro-EGMs allow more accurate PVC mapping, improving depth estimation. Micro-EGMs seem to be valuable for local activation time annotation with important implications on automated annotation algorithms within existing electroanatomic mapping systems.
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