Atrial fibrillation substrate mapping with emphasis on voltage-based guidance.

Area of Science:

• Cardiology
• Electrophysiology
• Medical Imaging

Background:

• Atrial fibrillation (AF) treatment benefits from voltage substrate mapping to detect atrial fibrosis.
• Low bipolar voltage areas indicate abnormal tissue and conduction, crucial for identifying substrate.
• Electrophysiology mapping platforms enable rapid construction of atrial geometric models.

Purpose of the Study:

• To describe and discuss voltage substrate mapping variables for AF and radiofrequency ablation.
• To highlight challenges affecting mapping quality and reproducibility.
• To suggest future research directions for standardization.

Main Methods:

• Utilizing electroanatomic mapping platforms with bipolar electrodes to record atrial voltage data.
• Projecting recording site coordinates onto an atrial shell with voltage data interpolation.
• Analyzing bipolar electrogram amplitude on a 3D shell for substrate characterization.

Main Results:

• Voltage substrate mapping reveals areas of low peak-to-peak voltage indicative of abnormal tissue.
• Uncontrolled variables (wavefront direction, catheter angle, force, tissue structure) impact voltage measurements.
• Current techniques for data acquisition and electrogram characterization lack standardization.

Conclusions:

• Voltage substrate mapping is a valuable tool for AF management, particularly in identifying fibrotic substrate.
• Standardization of mapping techniques and data analysis is essential for improving quality and reproducibility.
• Further research is needed to refine methods for AF substrate characterization and radiofrequency ablation guidance.