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Related Experiment Videos

Modeling bipolar phase-shifted multielectrode catheter ablation.

Supan Tungjitkusolmun1, Dieter Haemmerich, Hong Cao

  • 1Department of Electronics Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand.

IEEE Transactions on Bio-Medical Engineering
|January 17, 2002
PubMed
Summary

Radio-frequency ablation for atrial fibrillation (AFIB) can be improved using a bipolar phase-shifted technique. This method optimizes temperature distribution, minimizing hot and cold spots for safer and more effective AFIB treatment.

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Area of Science:

  • Biomedical Engineering
  • Computational Electrophysiology
  • Medical Device Design

Background:

  • Atrial fibrillation (AFIB) is a prevalent cardiac arrhythmia affecting 0.5-1% of the US population.
  • Radio-frequency (RF) multielectrode catheter (MEC) ablation is a common treatment for AFIB.
  • Unipolar RF ablation with MEC can lead to uneven myocardial temperature distribution, creating hot and cold spots.

Purpose of the Study:

  • To investigate a novel bipolar phase-shifted technique for RF energy delivery in MEC ablation.
  • To optimize the phase-shift angle for uniform myocardial temperature distribution.
  • To analyze the impact of tissue properties and electrode spacing on the optimal phase-shift.

Main Methods:

  • Finite-element method (FEM) analysis was used to model myocardial temperature distribution.

Related Experiment Videos

  • Simulations were performed for 30-second, 80°C temperature-controlled unipolar ablation with a three-electrode MEC.
  • A simplified 2D FEM model was developed to determine the optimal phase-shift (phi) for bipolar RF energy delivery.

    • Main Results:

    • Unipolar ablation resulted in undesirable hot spots at side electrodes and cold spots at the middle electrode edges.
    • The bipolar phase-shifted technique achieved a more uniform temperature distribution, minimizing edge temperature differences.
    • Optimal phase-shift varied with myocardial conductivity (23.5°-29.5°) and thermal conductivity (around 26.5°), and was 30.5° for 3-mm electrode spacing.

    Conclusions:

    • The bipolar phase-shifted technique offers improved temperature control during MEC ablation for AFIB.
    • Optimizing the phase-shift angle is crucial for achieving uniform tissue heating and minimizing thermal injury.
    • This approach has the potential to enhance the safety and efficacy of RF ablation for atrial fibrillation.