Which energy modality is characterized by tissue selectivity and sparing of neighboring structures?

• A. Pulsed field ablation
• B. Radiofrequency ablation
• C. Cryoablation
• D. Ultrasonic ablation

Answer: (A)

Pulsed field ablation works through irreversible electroporation, delivering short, high-voltage pulses that create permanent pores in cell membranes. This electrical effect tends to affect cardiomyocytes more readily than surrounding tissues, giving a selective injury to the targeted heart tissue while sparing neighboring structures like vessels and nerves due to differences in tissue composition and threshold for electroporation. In practice, this means effective ablation of cardiac tissue with reduced risk to nearby critical structures such as the esophagus. Thermal approaches like radiofrequency rely on heat diffusion and can damage adjacent tissue, cryoablation freezes tissue and can still affect nearby areas, and ultrasonic ablation causes mechanical disruption with less inherent selectivity.