What is the role of a line of conduction block during radiofrequency ablation (RFA) for atrial flutter radiofrequency ablation (RFA)?

Updated: Nov 18, 2019
  • Author: Lawrence Rosenthal, MD, PhD, FACC, FHRS; Chief Editor: Jeffrey N Rottman, MD  more...
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Answer

A line of conduction block is required to interrupt the circuit (see the image below). Postablation pacing maneuvers can confirm that the substrate required for the circuit has been modified.

Typical counterclockwise atrial flutter. This 3-di Typical counterclockwise atrial flutter. This 3-dimensional electroanatomic map of a tricuspid valve and right atrium shows the activation pattern displayed in color format. Red is early and blue is late, relative to a fixed point in time. Activation travels in counterclockwise direction.

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