Evaluation of Directed Graph-Mapping in Complex Atrial Tachycardias.

Area of Science:

• Electrophysiology
• Cardiac Mapping
• Medical Devices

Background:

• Catheter ablation of atrial tachycardia (AT) remains challenging due to difficulties in identifying the correct mechanism.
• High-density activation mapping (HDAM) offers detailed maps but mechanism identification is often operator-dependent, especially in complex AT cases.

Purpose of the Study:

• To evaluate the diagnostic accuracy of Directed Graph-Mapping (DGM), a novel operator-independent tool, in identifying complex atrial tachycardia mechanisms.
• To compare DGM's diagnostic performance against expert electrophysiologists and entrainment maneuvers (EM).

Main Methods:

• Retrospective analysis of 51 complex AT cases using HDAMs.
• Offline interpretation of HDAMs by 4 expert electrophysiologists.
• Analysis of electrograms and local activation times (LATs) using DGM.
• Comparison of DGM diagnoses with expert diagnoses and EM results.

Main Results:

• DGM diagnosed the correct AT mechanism and location in 38 out of 51 cases, compared to 33 cases identified by experts.
• DGM showed higher accuracy in identifying localized re-entries (7/10 vs. 2/10 experts) and comparable accuracy for macro-re-entries (13/22 DGM vs. 12/22 experts).
• Centrifugal activation patterns were identified correctly by both methods (13/13), and double-loops were identified in 5/6 by DGM versus 6/6 by experts.

Conclusions:

• Directed graph-mapping (DGM) is an automatic, fast, and operator-independent tool for identifying AT mechanisms, even in complex scenarios.
• DGM demonstrates potential as a valuable adjunct to existing mapping technologies for improving AT ablation targeting.
• The findings suggest DGM can enhance diagnostic accuracy and potentially streamline the catheter ablation procedure for atrial tachycardias.