Pseudo-Activation Maps for Ventricular Reentrant Circuit Visualization
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Solution Overview
Problem
Current methods for visualizing reentrant circuits in the heart, such as activation mapping and conventional pace-mapping, are limited by the need for sustained ventricular tachycardia and induced recordings, respectively, and fail to provide comprehensive visualization of reentrant circuit structure and orientation.
Innovation Solution
The generation of pseudo-activation maps using correlation gradients and stimulus-to-QRS delays from pace-mapping data, including correlation maps and sQRS delays, to identify and visualize reentrant circuits without requiring induced VT recordings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If activation mapping is used to visualize reentrant circuits, then comprehensive visualization of circuit structure and orientation is achieved, but sustained ventricular tachycardia is required which limits applicability
Solution Approach 1:
The patent performs pace-mapping procedures during sinus rhythm as a preliminary action, collecting ECG data and computing correlation gradients in advance. This preliminary data collection and processing enables subsequent visualization of reentrant circuits without requiring the patient to sustain VT, thus resolving the contradiction between visualization accuracy and method applicability.
2Reliability
If conventional pace-mapping is used to identify reentrant circuits, then induced VT recordings are required, but this fails to provide comprehensive visualization of circuit structure and orientation
Solution Approach 1:
The patent computes correlation gradients across multiple pacing sites and integrates them into a pseudo-activation map that visualizes the entire reentrant circuit pathway in two dimensions. This dimensional transformation from point-by-point pace-mapping to comprehensive spatial mapping provides complete circuit structure and orientation visualization while maintaining applicability during sinus rhythm.
3Measurement precision
If induced VT recordings are required for pace-mapping, then patient tolerance and procedure complexity increase, but visualization of reentrant circuits is enabled
Solution Approach 1:
The patent uses ECG data obtained during routine pace-mapping for sinus rhythm as the basis for computing correlation gradients and generating pseudo-activation maps. The system serves itself by utilizing already-collected data without requiring additional induced VT recordings, thus reducing procedure complexity while maintaining reentrant circuit identification accuracy.
Data Source
AI summary
Systems and methods are disclosed for visualizing reentrant circuits in the heart via pseudo-activation maps. Techniques disclosed comprise receiving sets of ECG data and respective pacing sites. Each of the sets is generated by pacing heart tissue at a respective site of the pacing sites. Techniques disclosed further comprise computing correlation gradients representative of morphological changes across sets, of the sets of the ECG data, of respective neighboring sites of the pacing sites. Based on the computed correlation gradients, a core zone associated with a reentrant circuit is identified. Then, relative to the identified core zone, one or more pseudo-activation maps are generated.