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High-density epicardial mapping during current injection and ventricular activation in rat hearts
E Macchi1, M Cavalieri, D Stilli
1Dipartimento di Biologia Evolutiva e Funzionale, Sezione Fisiologia, Università degli Studi, 43100 Parma, Italy.
The American Journal of Physiology
|November 14, 1998
Summary
Researchers developed new precision electrode arrays for high-resolution epicardial mapping in small animal hearts. These arrays enable detailed studies of heart electrophysiology and fiber structure in both normal and diseased states.
Area of Science:
- Biomedical Engineering
- Cardiovascular Physiology
- Electrophysiology
Background:
- Accurate electrophysiological mapping of small animal hearts is crucial for understanding cardiac function.
- Existing methods may lack the resolution required for detailed analysis of small hearts.
Purpose of the Study:
- To introduce novel methods for fabricating high-resolution electrode arrays for small animal epicardial mapping.
- To demonstrate the utility of these arrays in recording cardiac electrical activity.
Main Methods:
- Construction of 64-lead (8x8) and 121-lead (11x11) electrode arrays using fine silver wires on a tulle substrate.
- Removal of insulation at wire tips to create recording points with precise spacing.
- Recording of potential distributions and waveforms from saline and rat epicardium under various pacing and current injection conditions.
Main Results:
- Successful recording of epicardial potentials and waveforms from rat hearts.
- Comparison of results with larger animal studies, highlighting the detection of myocardial anisotropy.
- Interpretation of early epicardial potentials as originating from a quadrupolar source.
Conclusions:
- The developed electrode arrays are easily manufactured with high precision.
- These arrays facilitate detailed investigation of small heart electrophysiology and fiber structure.
- The technology supports studies in both normal and pathological conditions of small animal hearts.