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Comprehensive assessment of Mahaim accessory pathways' anatomic distribution.

Suat Gormel1, Salim Yasar1, Erkan Yildirim1

  • 1Department of Cardiology, Gulhane Research and Training Hospital, Ankara, Turkey.

The Journal of International Medical Research
|January 10, 2022
PubMed
Summary

Mahaim-type accessory pathways (MAPs) are most commonly ablated at the tricuspid annulus. This study highlights their varied anatomic localizations and successful ablation rates using M potential mapping.

Keywords:
Accessory pathwayMahaimablationanatomic distributionelectrophysiologysupraventricular tachycardia

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Arrhythmias

Background:

  • Mahaim-type accessory pathways (MAPs) are a type of cardiac accessory pathway that can cause arrhythmias.
  • Understanding the precise anatomic localization of MAPs is crucial for successful ablation.

Purpose of the Study:

  • To describe the experience with Mahaim-type accessory pathways (MAPs).
  • To focus on the anatomic localizations of MAPs during ablation procedures.
  • To evaluate the success rate of MAP ablation.

Main Methods:

  • Retrospective analysis of data from 55 consecutive patients undergoing electrophysiological study (EPS) for MAP ablation.
  • Data collected from two tertiary centers between January 1998 and June 2020.
  • Focus on ablation sites including tricuspid annulus, mitral annulus, paraseptal region, and right ventricle.

Main Results:

  • MAPs were most frequently ablated at the tricuspid annulus (78.2%).
  • Other locations included the mitral annulus (7.3%), paraseptal region (5.5%), and right ventricle (9.1%).
  • The success rate for ablation therapy in 49 patients was high at 91.8%.

Conclusions:

  • Mahaim-type accessory pathways (MAPs) demonstrate varied anatomic distributions, with a predilection for the tricuspid annulus.
  • The M potential mapping technique shows promise as a target for effective MAP ablation.
  • Successful ablation rates underscore the efficacy of current electrophysiological strategies for MAPs.