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. 2021 Apr 29;8:668944. doi: 10.3389/fmed.2021.668944

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Copyright © 2021 Petracek, Suskauer, Vickers, Patel, Violand, Swope and Rowe.

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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Heart rate, blood pressure, and symptom changes during a 10-min passive standing test in patient 1 (A) and patient 2 (B). LH, lightheadedness; Ftg, fatigue; bpm, beats per minute.