Evaluation of T-wave alternans activity under stress conditions after 5 d and 21 d of sedentary head-down bed rest [PDF]
, 2015 It is well known that prolonged microgravity leads to cardiovascular deconditioning, inducing significant changes in autonomic control of the cardiovascular system.
CAIANI, ENRICO GIANLUCA +5 more
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Respirology, Volume 31, Issue 5, Page 439-442, May 2026.
James H. Hull, Lizzie Grillo
wiley +1 more source
European Journal of Neurology, Volume 33, Issue 3, March 2026.Our systematic review and meta‐analysis of 11 studies, involving a total of 1162 participants, revealed that post‐COVID patients exhibited lower heart rate variability compared to the control group. The studies included in our analysis displayed moderate to high statistical heterogeneity, with nine out of 11 studies having a high risk of bias. Although
Daniela Schoene +5 more
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Post-Concussive Orthostatic Tachycardia is Distinct from Postural Orthostatic Tachycardia Syndrome (POTS) in Children and Adolescents [PDF]
, 2022 Rachel Pearson +7 more
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Idiopathic orthostatic hypotension: Recent data (eleven cases) and review of the literature [PDF]
Eight cases of Shy-Drager syndrome and three of Bradbury-Eggleston idiopathic orthostatic hypotension were examined. In all cases, examination of circulatory reflexes showed major dysfunction of the sympathetic vasoconstrictor system.
Annat, G. +9 more
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Primary dysfunction of the afferent limb of the arterial baroreceptor reflex system in a patient with severe supine hypertension and orthostatic hypotension [PDF]
, 1982 A 33 year old man with a history of recurrent episodes of orthostatic dizziness since adolescence was noted to have a supine blood pressure of 200/120 mm Hg and a standing blood pressure of 90/60 mm Hg.
Kochar, Mahendr S. +2 more
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Epilepsia, Volume 67, Issue 3, Page 1345-1357, March 2026.Abstract Objective This work was undertaken to describe the level of evidence for co‐occurring epileptic seizures in patients with known functional/dissociative seizures (FDS) using stratification criteria analogous to the International League Against Epilepsy criteria for functional seizures.
Shruti N. Iyer +16 more
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Increased Arrhythmia Risk in Long COVID: A Systematic Review and Meta‐Analysis
Journal of Arrhythmia, Volume 42, Issue 1, February 2026.This meta‐analysis included 14 studies. Long COVID was associated with a higher risk of atrial fibrillation, sinus tachycardia, sinus bradycardia, and ventricular arrhythmias. Patients with more severe COVID‐19 infection were at a higher risk of developing arrhythmias in the long term.
Amir Reza Boskabadi +5 more
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Neuronal and hormonal perturbations in postural tachycardia syndrome
Frontiers in Physiology, 2014 The Postural Tachycardia Syndrome (POTS) is the most common disorder seen in autonomic clinics. Cardinal hemodynamic feature of this chronic and debilitating disorder of orthostatic tolerance is an exaggerated orthostatic tachycardia (≥30 bpm increase in
Philip L. Mar, Satish R. Raj
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Connectivity differences between Gulf War Illness (GWI) phenotypes during a test of attention [PDF]
, 2019 One quarter of veterans returning from the 1990–1991 Persian Gulf War have developed Gulf War Illness (GWI) with chronic pain, fatigue, cognitive and gastrointestinal dysfunction. Exertion leads to characteristic, delayed onset exacerbations that are not
Baraniuk, James N. +6 more
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