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. 2020 Apr;17(4):576–583. doi: 10.1016/j.hrthm.2019.11.013

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© 2019 The Authors

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Example of reentry vulnerability index (RVI) identifying vulnerable sites close to a pace-mapped ventricular tachycardia. A: Anatomic map showing the VT site of origin (VT-SoO) as a white dot. B: RVI map. Each dot represents a cardiac site and RVI is color-coded. C: Map showing sites with the lowest 5% of RVI values. D,E: Unipolar electrograms (UEGs) from an electrode site showing high (D) and low (E) RVI (red line) and from neighboring electrode sites (gray). Red and gray circles represent repolarization time (RT) at the site of RVI measurement (RTP) and activation time (AT) at neighboring sites, respectively. Abbreviations as in Figure 4.