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. 2023 Nov 25;25(12):euad350. doi: 10.1093/europace/euad350

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© The Author(s) 2023. Published by Oxford University Press on behalf of the European Society of Cardiology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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The distribution of higher-order areas. (A) In H1, there are multiple Period-4 areas in a sea of classic alternans. (B) H2 shows both 1:4 and 1:6 areas. (C) H5 has large areas of Period-6 without significant Period-4. (D) The main feature of H6 is a large area of Period-8 without significant 1:2 or 1:4 regions . The background images represent anatomy. The pixels are colored based on their periodicitiy according to the colorbar on the right. Atr, atrial; El, pacing electrode; Ven, ventricles.