Verification of linear lesions using a noncontact multielectrode array catheter versus conventional contact mapping...

Area of Science:

• Electrophysiology
• Cardiac Ablation
• Medical Device Technology

Background:

• Linear lesions are created during cardiac ablation to achieve conduction block.
• Verifying complete conduction block is crucial for successful ablation.
• Conventional mapping techniques are sequential and time-consuming.

Purpose of the Study:

• To prospectively compare the accuracy of noncontact mapping with conventional techniques for verifying conduction block.
• To assess noncontact mapping's ability to identify discontinuities in linear lesions.

Main Methods:

• Prospective study in 12 patients with atrial flutter undergoing radiofrequency ablation.
• Comparison of pulse propagation mapping using conventional techniques and noncontact multielectrode array catheter.
• High-density isopotential mapping with the noncontact catheter.

Main Results:

• Noncontact mapping reliably distinguished conduction delays from complete conduction block.
• Noncontact mapping instantaneously identified areas of discontinuity in the ablation line.
• Complete conduction block was achieved with radiofrequency pulses guided by noncontact mapping.

Conclusions:

• Noncontact mapping is highly accurate in differentiating conduction delays from complete conduction block.
• Three-dimensional isopotential mapping facilitates localization of linear lesion discontinuities.
• Noncontact mapping aids in creating a complete conduction block, improving ablation success.