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. 2021 Jun 10;12:667065. doi: 10.3389/fphys.2021.667065

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Copyright © 2021 Ronzhina, Stracina, Lacinova, Ondacova, Pavlovicova, Marsanova, Smisek, Janousek, Fialova, Kolarova, Novakova and Provaznik.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Distributions of electrogram rhythm parameters in stained (n = 9) and non-stained (n = 11) hearts: P_D, PQ_D, QRS_D, RR_D, QT_D, and QT_C, duration of P wave, PQ interval, QRS complex, RR and QT intervals, and corrected QT intervals, respectively. Displayed for every second minute of the period as median, the edges of the box indicate 25th–75th percentiles. Stabilization, dye loading and washout correspond with the notation used in experimental protocol with di-4-ANEPPS. Horizontal lines indicate significant differences (p < 0.05) revealed via paired and unpaired tests. “+” indicates outlier.