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Calibrated single-plunge bipolar electrode array for mapping myocardial vector fields in three dimensions during
O C Deale1, K T Ng, E J Kim-Van Housen
1Department of Medicine, Weill Medical College of Cornell University, New York, NY 10021, USA. ocdeale@med.cornell.edu
IEEE Transactions on Bio-Medical Engineering
|August 14, 2001
Summary
This study introduces a novel bipolar electrode array (EA) for precise myocardial electric field mapping during defibrillation. The new electrode array significantly reduces measurement errors compared to traditional unipolar electrodes, improving accuracy in cardiac electrophysiology research.
Area of Science:
- Biomedical Engineering
- Cardiac Electrophysiology
- Medical Instrumentation
Background:
- Myocardial electric potential mapping during defibrillation typically uses unipolar electrodes, which are sensitive to measurement errors.
- Calculating vector potential gradients from unipolar data can lead to inaccuracies.
- Existing methods often require voltage dividers and a global potential reference, adding complexity.
Purpose of the Study:
- To present a calibrated single-plunge bipolar electrode array (EA) that overcomes the error sensitivity of unipolar electrodes.
- To enable simultaneous measurement of all three components of the myocardial electric field vector.
- To improve the accuracy and reliability of myocardial electric potential mapping.
Main Methods:
- Development of a triaxial, single-plunge bipolar electrode array (EA) with a local potential reference.
- Direct coupling of the EA to high-input-impedance amplifiers, eliminating the need for voltage dividers.
- Calibration using an electrolytic tank to determine unique calibration matrices for each EA via least squares multiple regression analysis.
- Correction for field perturbation and electrode axis non-orthogonality during calibration.
Main Results:
- The calibrated EA successfully measures all three components of the myocardial electric field vector.
- Calibration eliminates the need for mechanical measurement of electrode spacing.
- The mean vector magnitude root-mean-square (rms) error across ten EAs was 0.40% (SD 0.07%).
- The EAs were validated in multisite mapping during transthoracic shocks in dogs.
Conclusions:
- The calibrated bipolar electrode array offers a more accurate and robust method for myocardial electric field mapping.
- This technology reduces sensitivity to measurement errors inherent in unipolar electrode systems.
- The EA facilitates precise electrophysiological studies and defibrillation research.