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Intracranial Hypertension Is Painless!
R Manet1,2, N Fabre3, E Moyse3
1Department of Neurosurgery, University Hospital of Saint-Etienne, Saint-Etienne, France. romain.manet@neurochirurgie.fr.
Acta Neurochirurgica. Supplement
|May 12, 2016
Summary
Increased intracranial pressure (ICP) does not directly cause headaches in humans. Experimental data shows that acute, isolated rises in cerebrospinal fluid pressure do not trigger pain, suggesting other mechanisms are involved in headache development.
Area of Science:
- Neurology
- Neurosurgery
- Pain Medicine
Background:
- Headache is commonly associated with intracranial hypertension (ICHT).
- However, experimental evidence linking increased intracranial pressure (ICP) to pain in humans is lacking.
Purpose of the Study:
- To investigate whether an acute increase in ICP induces headache in patients.
- To determine the relationship between elevated ICP and headache intensity.
Main Methods:
- A prospective study involving 16 patients undergoing lumbar infusion tests for suspected normal-pressure hydrocephalus.
- ICP was elevated to a plateau, and headache severity was assessed using a visual analog scale (VAS).
Main Results:
- ICP significantly increased from a mean of 11 ± 3.6 mmHg to 28 ± 9.5 mmHg.
- Despite the rise in ICP, headache intensity (VAS) remained at 0, indicating no reported pain.
- An acute, moderate increase in ICP did not result in headache.
Conclusions:
- An isolated, acute increase in cerebrospinal fluid pressure does not cause headaches.
- Headache development requires activation of pain-sensitive structures (dura, venous sinuses) or central pain pathways, which are not triggered by isolated ICP elevation.
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