EP Edge

Pulsed field ablation (PFA) has rapidly transformed atrial fibrillation ablation, offering a non-thermal mechanism of myocardial injury through irreversible electroporation. While early clinical trials emphasized its favorable safety profile compared with radiofrequency and cryoablation, expanding real-world experience has revealed a distinct complication spectrum driven by high-voltage electric field interactions with myocardium, coronary arteries, blood, nerves, and cardiac implantable electronic devices. Unlike thermal injury, these complications are mediated by electrical, autonomic, and vascular effects, including delayed coronary vasospasm, malignant ventricular arrhythmias, and transient electrical instability. Understanding these mechanisms is critical as pulsed field ablation becomes more widely adopted in electrophysiology practice.This episode explores key complications including intravascular hemolysis and associated acute kidney injury, coronary artery spasm and ischemia, silent cerebral ischemic lesions, phrenic nerve injury, esophageal temperature elevation, and neuromuscular stimulation such as laryngospasm. These risks are strongly influenced by catheter design, lesion burden, waveform characteristics, and proximity to vulnerable structures. We also examine the interaction between pulsed field ablation and pacemakers and implantable cardioverter-defibrillators (ICDs), including transient pacing inhibition, electromagnetic interference, and rare cases of permanent device malfunction. As pulsed field ablation expands into more complex lesion sets and broader patient populations, recognizing these platform-specific risks is essential for procedural planning, patient selection, and post-procedural monitoring.Full references, detailed analysis, graphs, and visual summaries are available on the EP Edge Newsletter on LinkedIn, and the complete long-form article is also available on Substack at epedge.substack.com. If you have any questions, suggestions, or feedback, please contact epedgecast@gmail.com.

In this foundational episode of the EP Edge Newsletter Podcast, we examine the scientific and engineering principles underlying pulsed field ablation (PFA), a transformative advance in catheter ablation for atrial fibrillation. Unlike radiofrequency or cryoablation, which rely on thermal injury, pulsed field ablation produces myocardial lesions through irreversible electroporation, a non-thermal mechanism that disrupts the cell membrane by applying precisely controlled electric fields. This represents a fundamental shift in ablation biology, where lesion formation is governed not by heat, but by transmembrane voltage thresholds, membrane destabilization, and controlled cellular injury.This episode traces the history of electroporation, from its origins in physics and industrial biotechnology to its adoption in oncology as a non-thermal tumor ablation modality and eventual translation into cardiac electrophysiology. We then explore the Engineering Trinity of pulsed field ablation—the waveform, catheter, and pulse generator—and how these components interact to determine lesion size, safety profile, tissue selectivity, and procedural effectiveness. Understanding this integrated engineering system is essential to interpreting differences between pulsed field ablation platforms and explains why voltage alone does not define lesion durability or procedural success.We also examine the cellular and molecular mechanisms of PFA lesion formation, including nanopore creation within the lipid bilayer, calcium influx, ATP depletion, mitochondrial dysfunction, and regulated cell death pathways. These membrane-driven injury mechanisms produce lesions that differ fundamentally from thermal ablation, preserving extracellular architecture while eliminating cardiomyocytes. This unique biology underlies one of the most important advantages of pulsed field ablation—tissue selectivity, where myocardial cells demonstrate greater susceptibility to irreversible electroporation compared with surrounding structures such as the esophagus, nerves, and vasculature, enabling effective ablation with reduced collateral injury risk.Finally, we review the histopathology and structural evolution of pulsed field ablation lesions, including sharply demarcated injury zones, preserved tissue scaffolding, and progressive fibrocellular remodeling over time. These distinctive lesion characteristics explain both the safety profile and long-term behavior of pulsed field ablation and provide critical insight into how electrophysiologists should interpret acute procedural endpoints and long-term durability.Full references, detailed discussion, figures, and visual summaries are available on the EP Edge Newsletter on LinkedIn, as well as the full long-form edition on Substack at epedge.substack.com.If you have questions, suggestions, or feedback, please email epedgecast@gmail.com

In this issue, we trace the fascinating evolution of atrial fibrillation (AF) therapy — from the Cox Maze procedure to Haïssaguerre’s discovery of pulmonary vein ectopy, through Pappone’s wide antral isolation, and onward to the era of pulse field ablation (PFA).We explore how ablation technologies have transformed — radiofrequency, cryo, and PFA — yet the success rates remain stubbornly static. Why do some ablations fail? Are we reaching the limits of substrate modification, or simply targeting the wrong mechanisms?Join Dr. Sharma as he dissects the mechanistic layers of ablation failure — from pulmonary vein reconnection and atrial substrate remodeling to inflammation, fibrosis, and autonomic imbalance. The discussion looks ahead to next-generation strategies that may redefine success in AF therapy.If you enjoy this episode, subscribe and share the podcast to help grow the EPH community. For questions, suggestions, or collaboration ideas, reach out at EPEdgeCast@gmail.com

The paradigm is shifting. Ventricular tachycardia (VT) ablation is stepping out of the shadows—from rescue therapy to first-line strategy, driven by landmark trials like VANISH2, PAUSE-SCD, and PARTITA. Meanwhile, pulse field ablation (PFA) continues its rapid evolution—crossing over from atrial to ventricular applications—but questions about durability and embolic safety persist.In this episode of EP Edge, Dr. Niraj Sharma takes you through the key data shaping modern electrophysiology, from trial outcomes to emerging technology, including injectable light-activated pacemakers and telomere-targeting strategies that may redefine longevity and prevention.Whether you’re an EP, a general cardiologist, or in allied research, this episode offers evidence-based insights and forward-looking perspectives on where rhythm science is heading.For: Source data/infographics see EPEDGE Newsletter on LinkedInFor feedback, collaborations, or questions, email Dr. Niraj Sharma at epedgecast@gmail.comor connect on LinkedIn

Pulse field ablation (PFA) has been hailed as the next frontier in atrial fibrillation therapy—nonthermal, ultra-selective, and lightning fast. But as new data emerges, important questions are rising about its systemic effects, cerebral safety, and vascular complications.In this episode of EP Edge, Dr. Niraj Sharma unpacks the latest findings from the NEMESIS-PFA registry, explores silent cerebral lesion data, reviews a rare case of catastrophic coronary spasm, and introduces how AI—through models like DeePRISM—is changing how we think about ablation strategy.Whether you’re in the lab, in clinic, or leading research, this episode offers a critical look at where the field is heading next.For: Source data/infographics see EPEDGE Newsletter on LinkedInFor feedback, collaborations, or questions, email Dr. Niraj Sharma at epedgecast@gmail.comor connect on LinkedIn

In this episode of EP Edge Podcast, Dr. Niraj Sharma dives deep into the clinical promise and procedural realities of LBBAP:Clinical advantages: improved LVEF, narrower QRS, lower VT/VF and AF incidence.RV protection: reduced risk of pacing-induced cardiomyopathy.Sex-specific outcomes: women with NICM + LBBB derive greater benefit.Complications: lead fracture, TR progression, microperforations, and capture failure.Future directions: integrating imaging, refining technique, and advancing lead technology This is where physiology meets precision—and where CRT is being redefined. For: Source data/infographics see EPEDGE Newsletter on LinkedInFor feedback, collaborations, or questions, email Dr. Niraj Sharma at epedgecast@gmail.com or connect on LinkedIn