ArticleJournal of cardiovascular electrophysiology2026
Averaged Impedance Drop Estimates Conduction Gap During Pulmonary Vein Isolation in Atrial Fibrillation.
Article in Journal of cardiovascular electrophysiology, 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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7 authors.
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Abstract
backgroundEnSite X provides a module to filter oscillated generator impedance signals due to cardiac beating/respiration (averaged impedance drop, AID). TactiFlex ablation catheter Sensor Enabled (TFSE) is the latest product to incorporate a contact-force sensor with a flexible tip but without lesion-estimating parameters.
methodsTo examine if AID estimates lesion formation, AID were compared between ablated lesions (n = 1687) with and without conduction gaps (CGs) after first-pass pulmonary vein isolation (PVI) using TFSE in atrial fibrillation (AF) patients (n = 20). The clinical efficacy of AID-guided PVI was evaluated in another subset of AF patients (n = 30).
resultsCGs were observed in 45 points (CG[+]) but not in 1642 points (CG[-]). CG[+] had lower %AID (=absolute AID/initial impedance, p < 0.0001) than CG[-]. Decrease of bipolar voltage amplitude during radiofrequency application was linearly correlated with %AID (R
conclusionAID would improve the usability of impedance drop as an end point for RF application. %AID-guided PVI using TFSE would be effective in AF patients.
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