Arrhythmias & electrophysiology
Vector field heterogeneity as a novel omnipolar mapping metric for functional substrate characterization in scar-related ventricular tachycardias
Authors' conclusion
VFH mapping identified a significant increase in electrical heterogeneity at IS compared with bystanders with highest heterogeneity at the entrance. Yet, absolute differences were small, and substantial overlap among sites was recorded, precluding its use as a stand-alone mapping approach.
Study context
- Population
- Patients with scar-related ventricular tachycardia (VT) undergoing substrate mapping with a 16-pole grid catheter9 endocardial, 7 epicardial maps
- Participants
- 16 patients
- Comparison
- Isthmus sites (IS) vs LVA vs NVA
- Outcome
- Vector field heterogeneity (VFH; 0 = perfect planar wave to 1 = maximal disorganization)
Main finding
As reported in the abstract
VFH
IS
0.57
± 0.26
LVA
0.52
± 0.34
NVA
0.16
± 0.24
IS vs LVA: P < 0.001 · NVA vs IS and LVA: P < 0.001
Further findings
| Outcome | Entry | Exit |
|---|---|---|
| VFH within the isthmus | 0.61 ± 0.24 | 0.44 ± 0.27 |
Vector field heterogeneity (VFH) within the isthmus
- Highest heterogeneity at entry, lowest at exit sites
Original publication
Vector field heterogeneity as a novel omnipolar mapping metric for functional substrate characterization in scar-related ventricular tachycardias. Heart Rhythm. Published 7 November 2024. doi:10.
Summarised from the published abstract; every number is checked against it