Lumbar puncture, chronic fatigue syndrome and idiopathic intracranial hypertension: a cross-sectional study.
Higgins, Nicholas, Pickard, John, Lever, Andrew · JRSM short reports · 2013 · DOI
Quick Summary
This study looked at whether some people with ME/CFS might actually have a condition called idiopathic intracranial hypertension (IIH), which involves increased pressure around the brain and spinal cord. The researchers performed lumbar punctures (spinal taps) on ME/CFS patients with headaches and measured the fluid pressure around their spinal cord. They found that some patients improved after the procedure, suggesting a possible link between the two conditions.
Why It Matters
This research suggests that elevated intracranial pressure may contribute to symptoms in a subset of ME/CFS patients and that standard diagnostic criteria for IIH may be too stringent for identifying pressure-related pathology in this population. If confirmed, routine ICP screening could identify a treatable cause of ME/CFS symptoms in some patients.
Observed Findings
Mean cerebrospinal fluid pressure was 19 cm H₂O with a range of 12–41 cm H₂O
Four patients met formal diagnostic criteria for idiopathic intracranial hypertension
Thirteen patients had sub-diagnostic intracranial pressure elevations but reported headache improvement after CSF drainage
Some patients reported improvement in fatigue and other symptoms following lumbar puncture
No patient exhibited clinical signs of raised intracranial pressure on neurological examination
Inferred Conclusions
An unidentified minority of ME/CFS patients may have unrecognized IIH as a contributing factor
A larger proportion of ME/CFS patients may have pressure-related pathology that does not meet current IIH diagnostic criteria but still responds to therapeutic lumbar puncture
IIH and ME/CFS may share a pathophysiological relationship or overlap in some patients
Remaining Questions
What is the true prevalence of elevated intracranial pressure in the broader ME/CFS population?
Do ME/CFS patients have different intracranial pressure thresholds at which symptoms develop compared to IIH patients?
What This Study Does Not Prove
This study does not prove that IIH causes ME/CFS or that it is common in the ME/CFS population, as the sample was small and pre-selected for headache symptoms. The improvement after lumbar puncture does not definitively establish that elevated pressure is the cause of symptoms, and symptomatic improvement from a procedure can be influenced by placebo effects. The study cannot determine the prevalence of IIH in ME/CFS without a larger, unselected patient cohort.
Tags
Symptom:Fatigue
Biomarker:Neuroimaging
Method Flag:Weak Case DefinitionNo ControlsSmall SampleExploratory Only