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. 2022 Aug 15;66(4):1015–1028. doi: 10.1007/s10840-022-01308-8

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© The Author(s) 2022, corrected publication 2023

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Fig. 1 — Panoramic near-field electrogram recording with a basket catheter. A A 50 mm basket catheter (FIRMap™, Abbott, Abbott Park, IL) is shown in a left lateral position within the left atrium (LA) of a persistent atrial fibrillation (AF) patient. B During AF, unipolar electrograms (EGMs) show an irregular and variably-correlated pattern with earliest activation at E2 (blue arrows). Ablation at electrodes GH1 resulted in AF termination to an atypical LA flutter. C Unipolar EGMs obtained during atypical atrial flutter now demonstrate highly correlated and regular activation pattern with F3 as the point of earliest activation (orange arrows)