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Catheter-mediated electrical ablation: the relation between current and pulse width on voltage breakdown and
G H Bardy1, F Coltorti, R B Stewart
1Department of Medicine, University of Washington, Seattle.
Circulation Research
|August 1, 1988
Summary
Researchers defined safe electrical pulse limits for catheter ablation to prevent barotrauma. Understanding pulse amplitude and duration prevents voltage breakdown, enabling higher energy delivery for cardiac arrhythmia treatment.
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
- Electrical Engineering
Background:
- Barotrauma from voltage waveform breakdown is a risk during cardiac catheter ablation.
- Defining safe electrical parameters is crucial for preventing unintended tissue damage.
Purpose of the Study:
- To define in vitro limits of pulse amplitude and duration for rectangular constant-current pulses that avoid voltage breakdown.
- To determine safe pulsing frequencies for high-energy pulse trains in catheter ablation.
Main Methods:
- Utilized a variable waveform modulator to deliver electrical pulses (30-10,000 μsec duration, up to 25 A).
- Tested cathodal pulses on a catheter in bovine blood at 37°C to simulate cardiac conditions.
- Investigated the relationship between pulse duration, amplitude, and voltage waveform breakdown.
Main Results:
- Maximum pulse amplitude inversely correlated with pulse duration; 30 μsec pulses broke down above 24 A, while 10,000 μsec pulses broke down at 1 A.
- Maximum safe single-pulse energy was 2.5 J (80-120 μsec duration).
- Peak power (50-55 kW) and charge delivery (9 mC) varied with pulse parameters.
Conclusions:
- Safe limits for pulse amplitude and duration were established to prevent barotrauma during catheter ablation.
- Trains of pulses, individually within safe limits, can deliver higher energy than single pulses without breakdown.
- Findings provide critical parameters for optimizing catheter ablation safety and efficacy.