Grid-mapping catheters versus PentaRay catheters for left atrial mapping on ensite precision mapping system

Area of Science:

• Electrophysiology
• Cardiac Mapping
• Atrial Fibrillation Research

Background:

• Low-voltage areas (LVAs) in the left atrium (LA) after pulmonary vein isolation (PVI) are linked to recurrent atrial fibrillation (AF).
• Accurate mapping of these LVAs is essential for risk stratification and treatment planning.

Purpose of the Study:

• To compare the efficacy of the Grid Mapping Catheter (GMC) versus the PentaRay Catheter (PC) for LA voltage mapping.
• To evaluate differences in LVA and border zone size detection between the two catheter types.

Main Methods:

• Twenty-six patients with LVAs underwent voltage mapping using both GMC and PC after PVI.
• Mapping was performed on the Ensite Precision system with high right atrial pacing.
• LVAs were defined as <0.50 mV, and border zones as <1.0 mV or <1.5 mV.

Main Results:

• GMC yielded significantly more mapping points per minute compared to PC (1428 vs. 558).
• GMC identified significantly smaller LVA and border zone areas at <1.0 mV (5.9 cm² vs. 13.9 cm²) and <1.5 mV (10.6 cm² vs. 21.6 cm²) cutoffs.

Conclusions:

• GMC provides a larger number of mapping points and detects smaller LVAs and border zones compared to PC.
• GMC may offer more selective identification of LVAs, potentially improving risk stratification for AF recurrence.