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. 2022 Jan 20;8:808512. doi: 10.3389/fcvm.2021.808512

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Copyright © 2022 Wang, Sun, Zhang, Zhang, Liu, Wang, Tang, Jin and Du.

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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QT interval dispersion (QTd) (A) and corrected QT interval dispersion (QTcd) (B) in responders and non-responders with POTS treated with metoprolol. POTS, postural tachycardia syndrome; QTd, QT interval dispersion; QTcd, corrected QT interval dispersion; ms, millisecond, *p < 0.05; **p < 0.01.