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• W4366463705 startingPage "e0282943" @default.
• W4366463705 abstract "Background Amiodarone is commonly used during therapeutic hypothermia (TH) following cardiac arrest due to ventricular arrhythmias. However, electrophysiological changes and proarrhythmic risk after amiodarone treatment have not yet been explored in TH. Methods Epicardial high-density bi-ventricular mapping was performed in pigs under baseline temperature (BT), TH (32–34°C), and amiodarone treatment during TH. The total activation time (TAT), conduction velocity (CV), local electrogram (LE) duration, and wavefront propagation from pre-specified segments were analyzed during sinus rhythm (SR) or right ventricular (RV) pacing (RVP), along with tissue expression of connexin 43. The vulnerability to ventricular arrhythmias was assessed. Results Compared to BT, TH increased the global TAT, decreased the CV, and generated heterogeneous electrical substrate during SR and RVP. During TH, the CV reduction and LE duration prolongation were greater in the anterior mid RV than in the other areas, which changed the wavefront propagation in all animals. Compared to TH alone, amiodarone treatment during TH further increased the TAT and LE duration and decreased the CV. Heterogeneous conduction was partially attenuated after amiodarone treatment. After TH and amiodarone treatment, the connexin 43 expression in the anterior mid RV was lower than that in the other areas, compatible with the heterogeneous CV reduction. The animals under TH and amiodarone treatment had a higher incidence of inducible ventricular arrhythmias than those under BT or TH without amiodarone. Conclusion Electrical heterogeneity during amiodarone treatment and TH was associated with vulnerability to ventricular arrhythmias." @default.
• W4366463705 created "2023-04-22" @default.
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• W4366463705 date "2023-04-20" @default.
• W4366463705 modified "2023-10-14" @default.
• W4366463705 title "Epicardial electrical heterogeneity after amiodarone treatment increases vulnerability to ventricular arrhythmias under therapeutic hypothermia" @default.
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• W4366463705 doi "https://doi.org/10.1371/journal.pone.0282943" @default.
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