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. 2021 Jan 11;77(4):1234–1244. doi: 10.1161/HYPERTENSIONAHA.120.16113

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© 2021 The Authors.

Hypertension is published on behalf of the American Heart Association, Inc., by Wolters Kluwer Health, Inc. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial-NoDerivs License, which permits use, distribution, and reproduction in any medium, provided that the original work is properly cited, the use is noncommercial, and no modifications or adaptations are made.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure 3. — It compares untreated patients with postural tachycardia syndrome (POTS; red lines) with control (black lines) supine and during head-up tilt (HUT). Operating points are shown by red and black circles. G_max and the response range remained unchanged with tilt in control but were reduced in POTS, and further reduced in POTS when tilted. Additional key features of POTS include left lateral and downwards shifts of centering points and operating points and decreased response range with tilt.