Associations Between Autonomic and Orthostatic Self-report and Physician Ratings of Orthostatic Intolerance in Youth.
Schultz, Katlin R, Katz, Ben Z, Bockian, Neil R et al. · Clinical therapeutics · 2019 · DOI
Quick Summary
This study looked at whether what young people with ME/CFS report feeling about dizziness and heart symptoms matches what doctors measure during physical exams. Researchers compared answers from questionnaires with actual measurements of blood pressure and heart rate changes. They found that while patients reported these symptoms, the physical measurements didn't always show the same problems, suggesting current testing methods may miss real autonomic problems in young ME/CFS patients.
Why It Matters
This study highlights an important diagnostic gap in ME/CFS care: young patients clearly experience autonomic symptoms like orthostatic intolerance, but standard clinical measurements often fail to detect these problems. Understanding this mismatch is crucial for developing better diagnostic tools and helping physicians recognize autonomic dysfunction that current assessments may miss.
Observed Findings
Moderate correlation (r=0.58) between self-reported orthostatic and autonomic symptoms in youth with CFS-like illness
Weak to negligible correlations (r=-0.01 to 0.29) between self-reported autonomic symptoms and physician-measured changes in blood pressure and heart rate
No significant demographic differences between CFS-like group and healthy controls
Fewer correlations found between self-reported orthostatic symptoms specifically and objective physician measures compared to broader autonomic symptom reporting
Inferred Conclusions
Orthostatic dysfunction is reported by children and adolescents with CFS-like symptoms, but standard clinical physical measures may be inadequate to detect these problems
A disconnect exists between subjective patient experience of autonomic symptoms and objective clinical assessments using blood pressure and pulse measurements
Current diagnostic approaches may be missing real autonomic dysfunction in young ME/CFS patients due to limitations in assessment methodology
Remaining Questions
What alternative or more sensitive objective measures could better detect the autonomic symptoms that patients report experiencing?
Why is there such a disconnect between self-reported and physician-measured autonomic dysfunction in this population?
What This Study Does Not Prove
This study does not prove that autonomic dysfunction is absent in youth with ME/CFS; rather, it suggests current measurement methods are inadequate for detection. It does not establish causation or determine which measurement approach (self-report vs. physician assessment) is more accurate. The cross-sectional design cannot explain why correlations between subjective and objective measures are weak.
Tags
Symptom:Orthostatic IntoleranceFatigue
Biomarker:Blood Biomarker
Phenotype:Pediatric
Method Flag:Weak Case DefinitionSmall SampleExploratory Only
Do different ME/CFS subtypes or severity levels show different patterns between subjective and objective autonomic measurements?
Are there specific orthostatic or autonomic tests performed outside of standard blood pressure and pulse measurements that would better correlate with patient symptoms?