Cavotricuspid isthmus: Anatomy, electrophysiology, and long-term outcome of radiofrequency ablation

Abstract

The cavotricuspid isthmus (CTI) had a complex architecture with an anisotropic conduction property. An incremental pacing from the low right atrial isthmus produced a conduction delay and block, and initiated atrial flutter. Radiofrequency catheter ablation of the CTI was very effective in eliminating the typical atrial flutter. However, atrial fibrillation often occurred after ablation of the isthmus and needs further treatment. © 2009 Wiley Periodicals, Inc.