{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T18:00:42Z","timestamp":1787508042085,"version":"build-2736575974"},"reference-count":67,"publisher":"Public Library of Science (PLoS)","issue":"7","license":[{"start":{"date-parts":[[2025,7,2]],"date-time":"2025-07-02T00:00:00Z","timestamp":1751414400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Education Department of Yunnan Province-Project","award":["110014079307"],"award-info":[{"award-number":["110014079307"]}]},{"name":"Yunnan Provincial Department of Science and Technology","award":["202101BA070001-048"],"award-info":[{"award-number":["202101BA070001-048"]}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS One"],"abstract":"<jats:p>Postural Orthostatic Tachycardia Syndrome is characterized by an excessive increase in heart rate during postural changes without significant blood pressure alterations, often accompanied by symptoms such as dizziness, fatigue, and palpitations. While prior studies have explored potential mechanisms, the precise etiology and pathological basis of Postural Orthostatic Tachycardia Syndrome remain unclear, leading to treatments focused on symptom management rather than addressing root causes. This study employs a hemodynamic fluid-structure interaction model (using existing clinical data) to investigate the roles of hypovolemia, vascular dysfunction, and autonomic nervous system dysregulation in Postural Orthostatic Tachycardia Syndrome pathogenesis. Computational results revealed that hypovolemia reduces cerebral blood flow by approximately 100\u2009mL\/min due to a 30% decrease in blood volume, while vascular dysfunction\u2014marked by a 50\u2013100% increase in arterial stiffness\u2014further diminishes cardiac output and cerebral perfusion. These conditions trigger compensatory tachycardia through autonomic feedback mechanisms. Our findings demonstrate that an insufficient cerebral blood supply, driven by hypovolemia and impaired vascular compliance, combined with autonomic dysregulation, underlies the hallmark tachycardia in Postural Orthostatic Tachycardia Syndrome. This mechanistic insight provides a foundation for targeted therapeutic strategies, emphasizing the need to address blood volume management, vascular elasticity, and autonomic balance to improve clinical outcomes.<\/jats:p>","DOI":"10.1371\/journal.pone.0327236","type":"journal-article","created":{"date-parts":[[2025,7,2]],"date-time":"2025-07-02T13:37:52Z","timestamp":1751463472000},"page":"e0327236","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":4,"title":["Pathophysiological mechanisms of Postural Orthostatic Tachycardia Syndrome analyzed by means of 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