Esophageal Probe Compressive Sensing Atrial Signal Resolution
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Solution Overview
Problem
Conventional electrocardiography methods, such as 3-lead and 12-lead ECGs, face limitations in resolving atrial signals and providing spatial information, while esophageal electrocardiography has remained a niche due to challenges in equipment and signal sampling.
Innovation Solution
An esophageal probe with multiple electrode portions connected to a control unit that uses compressive sensing and synchronized averaging to calculate electrical fields with high spatial resolution, compensating for catheter motion and undersampling by tracking the catheter's position and interpolating heart beat patterns to create high-resolution esophageal isopotential maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional 3-lead or 12-lead ECG is used, then the equipment is simple and widely available, but the atrial signal resolution is limited and spatial information is insufficient
Solution Approach 1:
The esophageal probe is segmented into multiple electrode portions (at least three) spaced along the longitudinal axis, allowing separate measurement of electrical potentials at different locations. This segmentation enables high-resolution atrial signal detection by capturing spatial variations in the electrical field that conventional single-lead ECG cannot resolve.
Solution Approach 2:
The invention transitions from conventional 2D body surface mapping to 3D electrical field reconstruction by adding the longitudinal dimension along the esophageal probe. The control unit calculates electrical field vectors with three components (longitudinal, radial, and circumferential) based on potential differences between multiple electrode portions, providing spatial information in three dimensions that complements traditional ECG.
2Measurement precision
If esophageal probe with multiple electrodes is used, then spatial resolution of electrical field is improved, but the number of required measurements and data processing complexity increases
Solution Approach 1:
The control unit is pre-configured with the geometric relationships between electrode portions and the calculation algorithms for electrical field components. The system performs synchronized averaging of multiple heart beat patterns before calculating the electrical field, which reduces noise and simplifies subsequent processing. This preliminary organization of data reduces the complexity of real-time calculations.
Solution Approach 2:
The system uses synchronized averaging to create multiple copies of heart beat patterns from different cardiac cycles. By aligning and averaging these replicated patterns, the system enhances the signal-to-noise ratio and obtains a cleaner representation of the electrical field, reducing the need for complex noise filtering algorithms.
3Ease of operation
If catheter position varies during measurement, then patient comfort is maintained and movement is allowed, but measurement accuracy and spatial localization are degraded
Solution Approach 1:
The system dynamically tracks the position of the esophageal probe along the esophagus during the measurement process. The control unit records the longitudinal position of each electrode portion at different time points and uses this dynamic position information to correctly localize the measured electrical potentials in space, maintaining accuracy even as the probe moves due to patient movement or swallowing.
Solution Approach 2:
The system uses feedback from the measured electrical potentials themselves to detect and compensate for probe movement. By analyzing changes in the electrical field pattern over time, the control unit can infer probe displacement and adjust the spatial localization calculations accordingly, maintaining measurement accuracy without requiring external position tracking devices.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances spatial resolution of cardiac activity, allowing for improved detection of atrial arrhythmias and providing detailed 2D and 3D graphical representations of cardiac electrical fields, complementing traditional ECGs and aiding in rhythmology diagnostics.
Implementation Method 1
the control unit is configured to detect potential differences between different pairs of the electrode portions
Data Source
AI summary
An apparatus for providing arrhythmia information uses an esophageal probe having a longitudinal axis oriented in the direction of the esophagus where it is intended to be lodged, the probe comprising at least three electrode portions spaced in the longitudinal esophageal direction of the probe. The apparatus comprises a control unit, wherein the electrode portions are connected to the control unit, wherein the control unit is configured to detect potential differences between different pairs of the electrode portions. The control unit is configured to determine a repeating heart beat pattern as basis for a time resolved determination of the potential in the direction of the longitudinal axis and possibly also a perpendicular axis of the esophageal probe using compressive sensing. The apparatus is configured to provide a plot with the representation of the activation map as observed on the posterior wall or any other wall of the heart.