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Pain processing in medication overuse headache: a functional magnetic resonance imaging (fMRI) study
Stefania Ferraro1, Licia Grazzi, Maria Luisa Mandelli
1Neuroradiology Department Headache Centre, Carlo Besta Neurological Institute-IRCCS Foundation, Milan, Italy. stefania.ferraro@istituto-besta.it
Objective:
The primary aim was to investigate functional differences between medication overuse headache (MOH) patients and controls with the purpose of evaluating the presence of a global alteration in the processing of noxious stimuli throughout the pain matrix. The secondary aim was to investigate whether activations in MOH patients normalize after medication withdrawal, which would suggest a possible role of the pain matrix in headache chronification.
Design:
Functional magnetic resonance imaging was performed during painful mechanical stimulation in nine female patients with MOH immediately and at 6 months after beginning medication withdrawal, and in nine control participants.
Results:
Compared with controls, immediately after beginning withdrawal, the MOH patients showed reduced pain-related activity across the primary somatosensory cortex, inferior parietal lobule, and supramarginal gyrus, as well as in regions of the lateral pathway of the pain matrix. At 6 months, these differences were no longer detectable.
Conclusion:
Our findings suggest that significant functional changes occur in the lateral pain pathway in MOH patients. These could result from different processes: 1) cortical down-regulation aimed at reducing painful input to the cortex; 2) activity-dependent plasticity induced by excessive painful input during migraine attacks; and 3) direct effect of medication overuse. At 6 months after withdrawal, activity in these regions normalized, suggesting that no irreversible changes occur due to medication overuse.
Insights
Medication overuse headache (MOH) patients show altered pain processing in the brain
Area of Science:
- Neuroscience
- Pain Research
- Medical Imaging
Background:
- Medication overuse headache (MOH) is a common complication of primary headache disorders.
- The underlying pathophysiology of MOH, particularly alterations in pain processing, remains incompletely understood.
- Investigating the brain's pain matrix may offer insights into headache chronification.
Purpose of the Study:
- To examine functional differences in pain processing between MOH patients and controls.
- To determine if these functional differences normalize after medication withdrawal.
- To evaluate the role of the pain matrix in the chronification of headaches.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to assess brain activity.
- Painful mechanical stimulation was applied to participants.
- Nine female MOH patients and nine controls were studied immediately and 6 months post-medication withdrawal.
Main Results:
- MOH patients exhibited reduced pain-related activity in key brain regions, including the somatosensory cortex and parietal lobule, compared to controls.
- These functional differences were observed in the lateral pathway of the pain matrix.
- After 6 months of medication withdrawal, the observed differences in brain activity between MOH patients and controls were no longer detectable.
Conclusions:
- Significant functional alterations in the lateral pain pathway are present in MOH patients.
- These changes may be due to cortical down-regulation, activity-dependent plasticity, or medication effects.
- Normalization of brain activity after medication withdrawal suggests that the changes associated with medication overuse are reversible and not permanent.
