• Gansevoort H Dunnington, Stephen D Waterford, Darrin Uecker, Lauren Johnston, David Danitz, Anita Crompton, and Niv Ad.
• Department of Cardiothoracic Surgery, Adventist-Health Saint Helena, Saint Helena, CA. Electronic address: gansevoort@gmail.com.
• J. Thorac. Cardiovasc. Surg. 2024 Dec 5.

ObjectiveThe purpose of this chronic porcine model is to demonstrate safety and efficacy of a new nanosecond pulsed field ablation (nsPFA) parallel clamp in ablating different cardiac tissue.MethodsThe Pulse Biosciences nsPFA CellFX Clamp System was tested on 6 pigs. Ablations were performed in all four heart chambers by delivering a sequence of very short duration high amplitude electrical pulses taking 1.25 seconds per application independent of tissue thickness or type. Testing for electrical exit block was performed at the time of surgery and at study termination. At 35 days, animals were euthanized and anonymized histopathology was performed to assess lesion width, depth and transmurality. Lesion pattern and general safety was compared to 6 animals in which a bipolar radiofrequency clamp was used (AtriCure Synergy Isolator System).ResultsThere were no device-related serious adverse events in the nsPFA group. There was one early device related mortality at day 24 in the RFA group from perforation of one of the ventricular ablation sites. There were also two intracardiac thrombotic events with one systemic thromboembolic event in the radiofrequency group. Exit block was confirmed in all animals from both groups for the pulmonary veins and the posterior wall. Histological findings were consistent and demonstrated mature scar formation in all nsPFA ablation specimens, while a 7.1% rate of incomplete histopathological scar maturation was present in the RFA group.ConclusionsIn this chronic porcine model, a single 1.25 second application independent of tissue thickness with the CellFX Parallel Clamp System demonstrated promising safety and efficacy profile. All lesions produced by this technology resulted in persistent exit block around pulmonary veins and the posterior atrial wall consistent with a reliable, contiguous and transmural ablation without injury to adjacent organs.Copyright © 2024. Published by Elsevier Inc.

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