Pulsed-field ablation: Computational modeling of electric fields for lesion depth analysis

Area of Science:

• Cardiovascular research
• Medical device technology
• Electrophysiology

Background:

• Pulsed-field ablation (PFA) is a novel nonthermal cardiac ablation technology.
• The precise voltage needed for effective myocardial injury with PFA is not fully understood.
• PFA's pulsed-field strength is independent of tissue contact, leading to assumptions about contact necessity.

Purpose of the Study:

• To investigate the relationship between applied voltage, catheter-to-surface distance, and myocardial injury depth during PFA.
• To quantify the impact of these parameters on irreversible myocardial damage.

Main Methods:

• A computational model was developed and validated using in vivo data.
• The model simulated PFA to analyze varying applied voltages and catheter-tissue distances.
• The study focused on predicting the depth of irreversible myocardial injury.

Main Results:

• Lesion depth in PFA is dose-dependent, directly correlating with applied voltage.
• A minimum of 300 volts is required for lesions >1 mm deep.
• Optimal catheter contact is vital; a 1-2 mm gap increases the required voltage from 700 to 1500 volts for a 3 mm lesion.

Conclusions:

• PFA demonstrates dose-dependent effects on myocardial injury depth.
• Maintaining consistent catheter-tissue contact is critical for effective PFA outcomes.
• These findings highlight the importance of precise parameter control in PFA procedures.