Catheter Ablation -> SVT/AVNRT/WPW/AT: -> Mapping & Imaging D-PO05 - Poster Session V (ID 39) Poster

D-PO05-173 - Evaluation Of Amplitude Maps Produced By Supermap® Multi-position Non-contact Mapping In Stable Arrhythmias (ID 1293)

Abstract

Background: Bipolar voltage amplitude of contact (C) electrograms (EGMs) is commonly used to assess abnormal tissue in stable arrhythmias. SuperMap, a novel multi-position, non-contact (NC) mapping method (Acutus Medical) time aligns data from multiple catheter positions to a stable reference to reconstruct unipolar charge density EGMs that allow rapid creation of high-resolution, full-chamber maps of the arrhythmia.
Objective: Compare the correspondence between SuperMap amplitude maps (SAMs) and bipolar voltage amplitude maps (BAMs) generated by contact EGMs.
Methods: Bipolar voltage C measurements were collected using the HDGrid (Abbot Labs) system in 5 patients and interpolated (≤ 1cm) to create BAMs. NC measurements (>5mm from the surface) were collected using SuperMap. A SAM was created by applying a Laplacian operator on charge density EGMs and estimating the peak to peak amplitude. Low amplitude points (LAP) (<= 0.5mV) were extracted from SAMs and BAMs. KL divergence (KLD) was calculated between SAM and BAM LAP distributions. KLD is used to estimate the similarity between two distributions. To establish a reference measurement of similarity, KLD was also calculated for LAPs close in proximity (LAPc, <1mm) after registering SAM and BAM geometries. For LAPc, similarity between distributions was tested using a KS test.
Results: KLD for LAPs was between [0.004,0.09] ([min,max]), which was in the same range ([0.005,0.10]) as KLD for LAPc. A KS test showed that the distribution of LAPc BAMs and SAMs was not significantly different (α= .01), implying that the distribution of LAP BAMs and SAMs are similar.
Conclusion: SuperMap can produce amplitude maps comparable to C BAMs.
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