Conduction Velocity Mapping for Arrhythmia Diagnosis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current electrocardiographic imaging techniques are inadequate for noninvasive investigation of post-AF ablated atrial tachycardias, particularly due to complexity and altered electrogram voltages, limiting effective management of ventricular and atrial tachycardias.
Innovation Solution
A method and system for conduction velocity and pattern mapping that define a region of interest on a three-dimensional cardiac surface, project it orthogonally onto a two-dimensional surface, and estimate two- and three-dimensional conduction velocity vectors based on electrophysiological signals, enabling improved visualization and identification of arrhythmogenic mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electrocardiographic imaging techniques are used for post-AF ablated atrial tachycardia investigation, then the investigation can be performed noninvasively, but the measurement precision and reliability are inadequate due to complexity and altered electrogram voltages
Solution Approach 1:
The patent transitions from traditional two-dimensional ECG imaging to three-dimensional conduction velocity mapping. By projecting electrogram signals onto a 3D cardiac surface model and calculating conduction velocity vectors in three-dimensional space, the system achieves superior diagnostic accuracy for complex post-AF ablated atrial tachycardias that cannot be adequately visualized using conventional 2D techniques
2Measurement precision
If comprehensive conduction velocity mapping is performed across the entire cardiac surface, then diagnostic accuracy is improved, but the computational complexity and processing time increase significantly
Solution Approach 1:
The patent divides the cardiac surface into discrete triangular elements forming a 3D mesh model, with electrodes assigned to specific nodes. Conduction velocity is calculated independently for each triangular element using local electrogram signals from adjacent electrodes. This segmentation approach enables comprehensive 3D mapping while maintaining computational tractability through parallel processing of individual elements
Solution Approach 2:
The system calculates conduction velocity vectors locally for each triangular element on the cardiac surface using only the electrogram signals from electrodes associated with that element and its neighbors. This local calculation approach reduces computational complexity compared to global analysis methods while preserving measurement accuracy for each specific region of the cardiac surface
3Loss of information
If detailed three-dimensional conduction velocity vectors are estimated for all nodes, then arrhythmogenic mechanisms are better identified, but the loss of time in signal processing and map generation increases
Solution Approach 1:
The patent performs preliminary orthogonal projection of the 3D region of interest onto a 2D tangential plane before calculating conduction velocity vectors. This preliminary geometric transformation simplifies subsequent velocity calculations by reducing the dimensional complexity, thereby decreasing processing time while preserving the essential 3D spatial relationships needed for accurate arrhythmia mechanism identification
Data Source
AI summary
Systems and methods can be used to determine conduction velocity and generate one or more conduction velocity and/or pattern maps to facilitate identification of arrhythmogenic mechanisms.