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Cardiology

Vasovagal syncope and postural orthostatic tachycardia syndrome in adolescents: transcranial doppler versus autonomic function test results

Dong Won Lee

Clin Exp Pediatr. 2025;68(9):673-679. Published online August 6, 2025

Question: Vasovagal syncope (VVS) and postural orthostatic tachycardia syndrome (POTS) are representative forms of neurally mediated syncope. What influences the occurrence of each?
Finding: Autonomic function test results did not differ, but cerebral blood flow during diastole on transcranial doppler differed between VVS and POTS.
Meaning: Differences in diastolic cerebral blood flow velocity play an important role in VVS and POTS.

DOI: https://doi.org/10.3345/cep.2025.00927

Orthostatic symptoms does not always manifest during tilt-table test in pediatric postural orthostatic tachycardia syndrome patients

Tae-Eon Huh, Jung Sook Yeom, Young-Soo Kim, Hyang-Ok Woo, Ji Sook Park, Eun Sil Park, Ji-Hyun Seo, Jae-Young Lim, Chan-Hoo Park, Ki-Jong Park, Hee-Shang Youn

Clin Exp Pediatr. 2013;56(1):32-36. Published online January 29, 2013

Crossref 1

Purpose

Chronic day-to-day symptoms of orthostatic intolerance are the most notable features of postural orthostatic tachycardia syndrome (POTS). However, we have encountered patients with such symptoms and excessive tachycardia but with no symptoms during the tilt-table test (TTT). We aimed to investigate whether POTS patients with chronic orthostatic intolerance always present orthostatic symptoms during the TTT and analyze the factors underlying...

DOI: https://doi.org/10.3345/kjp.2013.56.1.32

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