Psychogenic Pseudosyncope: Real or Imaginary? Results from a Case-Control Study in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) Patients. — CFSMEATLAS
Psychogenic Pseudosyncope: Real or Imaginary? Results from a Case-Control Study in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) Patients.
van Campen, C Linda M C, Visser, Frans C · Medicina (Kaunas, Lithuania) · 2022 · DOI
Quick Summary
Some ME/CFS patients experience frequent fainting or near-fainting spells and have been told these are psychological in origin. This study compared brain blood flow in ME/CFS patients with these spells to ME/CFS patients without them during a tilt test (where you're gradually tilted upright). The group with fainting spells showed a much larger drop in blood flow to the brain, suggesting their symptoms have a physical cause rather than a psychiatric one.
Why It Matters
This research challenges the misdiagnosis of syncope as psychogenic in ME/CFS patients, providing objective physiological evidence that frequent fainting spells reflect real cardiovascular dysfunction. Recognition of the somatic basis for these symptoms may redirect clinical management toward appropriate physical interventions and away from psychiatric treatments, improving outcomes and reducing patient harm from misattribution.
Observed Findings
ME/CFS patients with frequent syncope showed 39% mean cerebral blood flow reduction at end-tilt versus 25% in matched ME/CFS controls (p<0.0001)
Cases with syncope had more severe disease and higher rates of POTS diagnosis compared to controls
End-tidal CO2 levels differed between groups but with smaller magnitude than CBF differences
Compression stockings reduced cardiac output reduction from 29 mmHg to 25 mmHg (p<0.005)
No significant differences in heart rate or blood pressure were found between groups at end-tilt
Inferred Conclusions
Orthostatic intolerance with syncope in ME/CFS patients previously labeled as having psychogenic pseudosyncope has a demonstrable somatic pathophysiologic mechanism involving cerebral hypoperfusion
The large CBF reduction in symptomatic patients represents a real, measurable physiological abnormality rather than a behavioral or psychiatric disorder
Compression stockings may provide partial hemodynamic compensation by maintaining cardiac output during postural stress
Remaining Questions
What specific mechanisms cause the exaggerated CBF reduction in ME/CFS patients with syncope compared to those without?
Does the degree of CBF reduction correlate with symptom severity or treatment response to hemodynamic interventions?
What This Study Does Not Prove
This study does not establish causality—it demonstrates correlation between reduced cerebral blood flow and syncope in this cohort but cannot prove CBF reduction directly causes the fainting episodes. The findings cannot be generalized to all ME/CFS patients or all cases of suspected psychogenic syncope in other populations. The study does not evaluate the long-term clinical consequences of these hemodynamic findings or test specific treatment interventions.
Can these findings be replicated in larger, multicenter cohorts, and do they apply to ME/CFS patients with milder orthostatic symptoms?
Which targeted interventions (pharmacological, physical, or rehabilitative) are most effective for correcting the cerebral hypoperfusion in this subgroup?