Related Experiment Video
Updated: Jun 10, 2026
08:19
Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping
Published on: February 22, 2018
Feasibility of high-density electrophysiological study using multiple-electrode array in isolated small animal atria
Dennis H Lau1, Lorraine Mackenzie, Nicholas J Shipp
1Cardiovascular Research Centre, Department of Cardiology, Royal Adelaide Hospital, Disciplines of Medicine and Physiology, University of Adelaide, Adelaide, Australia.
Clinical and Experimental Pharmacology & Physiology
|July 28, 2010
Summary
This study demonstrates a new, cost-effective method for high-density cardiac electrophysiological study (EPS) in small animal atria using a custom multiple-electrode array (MEA). This technique offers reproducible results and is compatible with standard equipment, advancing arrhythmia research.
Area of Science:
- Cardiovascular Physiology
- Electrophysiology
- Biomedical Engineering
Background:
- High-density cardiac electrophysiological study (EPS) in small animal atria has been challenging, often relying on complex and expensive optical mapping techniques.
- Existing methods limit detailed investigation of atrial electrophysiology in small animal models.
Purpose of the Study:
- To evaluate the feasibility of performing high-density EPS in isolated rat atrial tissues using a custom-designed multiple-electrode array (MEA).
- To establish a novel, cost-effective alternative to optical mapping for small animal atrial electrophysiology.
Main Methods:
- Isolated rat atrial preparations were superfused and placed over a 90-electrode MEA (0.5 mm pitch).
- Motion artifacts were suppressed using 2,3-butanedione monoxime, and data were analyzed with custom software.
- Electrophysiological parameters including effective refractory period, conduction velocity, and heterogeneity index were assessed.
Main Results:
- Isolated atrial tissues maintained viability for over 30 minutes, enabling complete EPS.
- High-quality electrograms with excellent signal-to-noise ratios were consistently obtained.
- Key electrophysiological parameters demonstrated good reproducibility, and inducible tachycardia was observed.
Conclusions:
- High-density EPS of small isolated atrial tissues is feasible using a conventional electrode-based MEA technique.
- The MEA system is compatible with standard electrophysiology recording systems, offering an inexpensive option for small animal models.
- This method opens new research avenues for exploring atrial arrhythmias in various rodent models.
