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Related Experiment Video

Updated: Mar 30, 2026

Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
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Pace mapping in the atrium using bipolar electrograms from widely spaced electrodes.

Raja J Selvaraj1, Sreekanth Yerram1, Pradeep Kumar1

  • 1Department of Cardiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry 605006, India.

Journal of Arrhythmia
|November 10, 2015
PubMed
Summary

Improving atrial pace mapping resolution is crucial. Using bipolar electrograms from widely spaced electrodes enhances spatial resolution compared to standard electrocardiograms, aiding in accurate tachycardia mapping.

Keywords:
ArrhythmiaAtrial arrhythmiaComputerized analysisMappingPace mapping

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Area of Science:

  • Electrophysiology
  • Cardiology
  • Medical Devices

Background:

  • Pace mapping is valuable for cardiac arrhythmia diagnosis but has limited utility in the atrium due to poor spatial resolution.
  • Investigating novel methods to enhance atrial pace mapping resolution is essential for improved clinical practice.

Purpose of the Study:

  • To evaluate the effectiveness of bipolar electrograms from widely spaced electrodes for improving atrial pace mapping resolution.
  • To compare the spatial resolution of pace mapping using bipolar electrograms versus surface electrocardiograms.

Main Methods:

  • Prospective study involving patients undergoing electrophysiology studies.
  • Simulated atrial tachycardia using unipolar pacing in the right atrium.
  • Recorded 12-lead electrocardiograms and three-channel intracardiac bipolar electrograms.
  • Compared P-wave morphology from electrocardiograms and bipolar electrograms during pacing at varying distances.
  • Calculated spatial resolution based on morphological matching by cardiologists and automated analysis.

Main Results:

  • Fifteen patients were included in the study.
  • Bipolar electrograms demonstrated significantly smaller distances for morphological differences compared to surface electrocardiograms (cardiologist: 6.1±3.8 mm vs. 9.9±5.2 mm; automated: 4±0 mm vs. 9.9±4 mm).
  • Automated analysis showed superior performance in distinguishing pacing sites.

Conclusions:

  • Utilizing three bipolar electrograms from widely spaced electrodes in the right atrium significantly improves pace mapping resolution.
  • This method offers a superior alternative to relying solely on P waves from surface electrocardiograms for atrial tachycardia mapping.