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Related Experiment Video

Updated: Dec 30, 2025

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
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Beamforming-inspired Spatial Filtering Technique for Intracardiac Electrograms.

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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 18, 2020
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    Summary
    This summary is machine-generated.

    A new beamforming-inspired spatial filtering (BiSF) method reduces uncertainty in bipolar electrograms (EGM). This improves the interpretation of EGM and measures used for catheter ablation targeting atrial fibrillation.

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    Area of Science:

    • Electrophysiology
    • Biomedical Engineering
    • Medical Imaging

    Background:

    • Bipolar electrograms (EGM) are crucial for assessing intracardiac electrical activity and identifying atrial fibrillation sources.
    • Interpreting bipolar EGM is challenging due to the significant impact of lead orientation on signal dynamics and derived measures used in catheter ablation.
    • Current methods face measurement uncertainty, potentially affecting clinical decisions for atrial fibrillation treatment.

    Purpose of the Study:

    • To develop and evaluate a novel method to reduce measurement uncertainty in bipolar electrograms (EGM).
    • To improve the accuracy of EGM interpretation and EGM-derived measures for catheter ablation targeting atrial fibrillation.
    • To enhance signal quality and reduce noise in intracardiac recordings.

    Main Methods:

    • Recorded left atrial unipolar electrograms (EGM) using a 16-electrode grid.
    • Constructed bipolar EGM from unipolar signals to assess measurement uncertainty.
    • Developed and applied a beamforming-inspired spatial filtering (BiSF) method using multiple bipolar lead orientations.
    • Intertwined beamforming EGM signals to generate BiSF EGM for improved signal acquisition.

    Main Results:

    • The novel BiSF method demonstrated a signal power gain of at least 10dB compared to conventional bipolar EGM.
    • BiSF EGM exhibited comparable or better signal-to-noise ratios than their bipolar counterparts.
    • The results indicate a significant reduction in measurement uncertainty for BiSF EGM.

    Conclusions:

    • The proposed BiSF method effectively reduces uncertainty in bipolar electrograms (EGM).
    • Improved EGM interpretation and derived measures can enhance clinical decision-making for catheter ablation.
    • Further validation on larger datasets is recommended to confirm the clinical utility of BiSF EGM.