"Electrophysiology (EP) continues to evolve, with new research shaping how we manage arrhythmias, optimize interventions and improve patient outcomes," says JACC Editor-in-Chief Harlan M. Krumholz, MD, FACC. A special EP-focused issue of JACC reflects the "growing sophistication" of arrhythmia management, and explores critical developments in atrial and ventricular arrhythmia treatment. Check out the full issue.