1. Introduction:
The definition of Atypical Atrial Flutter (AAFL) includes a broad spectrum of macro-reentrant atrial tachycardias (MRAT) in which the wavefront does not include the Cavo-Tricuspid Isthmus (CTI) part of the tricuspid annulus [1] .
There is a substantial increase in the incidence of AAFL as an iatrogenic problem in patients who have had a catheter ablation procedure for treating AF or a surgical MAZE procedure [2] .
In AAFL, especially in patients who had surgery or catheter ablation, an electrophysiology study (EP study) is the only way to unveil the mechanism [3] . An electrophysiology study, including entrainment characteristics and high-density mapping consistent with reentry, must confirm the ultimate diagnosis of AAFL [4] .
Catheter ablation is frequently utilized due to lack of efficacy of medications or significant symptoms and deteriorating left ventricular function [4,5] .
Entrainment and point-to-point map acquisition with large tip (8mm) catheter ablation was common until recently. However, in the last few years, a more comprehensive understanding of propagation and critical zones has been possible by high-density electroanatomical mapping utilizing small-diameter, multipolar catheters. Multipolar maps may have advantages over traditional point-by-point voltage maps. One such advantage is higher mapping resolution, which facilitates the detection of slow conduction zones. Additionally, multipolar maps improve the accuracy and speed of mapping procedures due to the function of smaller electrodes. Finally, pace capture can be achieved at the lower output due to increased electrical density [6,7]. Therefore, we wanted to explore the outcome of the AAFL ablation, considering the recent changes in mapping and ablation.