Chouksey, Dinesh, Rathi, Pankaj, Sodani, Ajoy et al. · AIMS neuroscience · 2021 · DOI
This study looked at patients who experience dizziness, fainting, or heart racing when standing up—symptoms of a condition called POTS (Postural Orthostatic Tachycardia Syndrome). Researchers tested 246 patients with these symptoms and confirmed POTS in 40 of them using a special tilt-table test. Most POTS patients experienced fainting, lightheadedness, and heart palpitations, and nearly half also had a related condition causing fainting.
Many ME/CFS patients experience orthostatic intolerance and may have underlying POTS that goes undiagnosed in routine clinical practice. This study highlights the diagnostic importance of tilt-table testing in young patients with unexplained fainting and autonomic symptoms, conditions that overlap substantially with ME/CFS presentations. Understanding POTS prevalence in orthostatic intolerance cohorts helps clarify whether autonomic dysfunction is a distinct comorbidity or shared pathophysiological feature in ME/CFS.
This study does not establish whether POTS causes ME/CFS or vice versa—it only describes POTS prevalence in a selected population with orthostatic symptoms. The cross-sectional design cannot determine causality or directionality of symptom relationships. This study also does not compare POTS prevalence in ME/CFS patients specifically versus other populations, limiting conclusions about ME/CFS-POTS overlap.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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