Conduction block in the inferior vena caval-tricuspid valve isthmus: Association with outcome of radiofrequency ablation of type I atrial flutter

Abstract

Isthmus conduction block is associated with flutter ablation success. Conduction slowing or intermittent block, or both, in the isthmus can occur before achieving persistent block. Recovery of conduction after achieving block is common. Follow-up has revealed a low rate of flutter recurrence after achieving isthmus conduction block, whether the block was achieved in conjunction with termination of flutter.