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Related Experiment Video

Updated: Jan 19, 2026

Ablation of Ischemic Ventricular Tachycardia Using a Multipolar Catheter and 3-dimensional Mapping System for High-density Electro-anatomical Reconstruction
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Grid Mapping Catheter for Ventricular Tachycardia Ablation.

Kenji Okubo1, Antonio Frontera1, Caterina Bisceglia1

  • 1Arrhythmology Unit, San Raffaele Hospital, Milan, Italy (K.O, A.F., C.B., G.P., A.R., L.F., P.D.B.).

Circulation. Arrhythmia and Electrophysiology
|September 11, 2019
PubMed
Summary

A new grid mapping catheter (GMC) precisely identifies low-voltage areas and visualizes ventricular tachycardia (VT) pathways. This tool improves VT ablation success rates by enabling accurate substrate and activation mapping.

Keywords:
catheter ablationdiastolemappingmultielectrodeventricular tachycardia

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Area of Science:

  • Electrophysiology
  • Cardiovascular Medicine
  • Medical Devices

Background:

  • A novel grid mapping catheter (GMC) enables bipolar electrogram recordings in orthogonal directions.
  • The study evaluates the utility of GMC for substrate and ventricular tachycardia (VT) activation mapping during ablation procedures.

Purpose of the Study:

  • To assess the effectiveness of the GMC in creating detailed substrate and VT activation maps.
  • To compare different GMC configurations for identifying low-voltage and late potential areas.
  • To investigate the relationship between VT diastolic activity and substrate abnormalities.

Main Methods:

  • 41 patients undergoing VT ablation with GMC were studied.
  • Substrate mapping utilized three GMC bipolar configurations (along spline, across spline, HD wave).
  • VT activation mapping focused on the diastolic interval, correlating with substrate during sinus rhythm.

Main Results:

  • The HD wave configuration identified significantly smaller low-voltage areas compared to other configurations (P<0.0001).
  • VT activation mapping visualized the full diastolic pathway in 55% of VTs.
  • Complete visualization of the diastolic pathway led to higher VT termination rates (88% vs. 45%, P=0.03) and noninducibility.

Conclusions:

  • The GMC is valuable for precise substrate and VT activation mapping during ablation.
  • It facilitates accurate identification of low-voltage areas and visualization of diastolic pathways.
  • The GMC enhances VT ablation outcomes through improved mapping capabilities.