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Changes in cortical processing of pain in chronic migraine
Marina de Tommaso1, Luciana Losito, Olimpia Difruscolo
1Department of Neurologic and Psychiatric Sciences, University of Bari, Bari, Italy.
Headache
|September 24, 2005
Summary
Chronic migraine (CM) patients show distinct brain responses to pain compared to migraine without aura (MWA) and controls. This suggests a specific pattern in the anterior cingulate cortex (ACC) may predispose individuals to chronic migraine.
Area of Science:
- Neuroscience
- Pain Research
- Medical Imaging
Background:
- Previous studies indicate heightened activation in pain-related emotional and attention cortical areas during migraine attacks.
- This activation is more pronounced in patients with higher migraine frequency.
Purpose of the Study:
- To analyze topographic and dipolar characteristics of nociceptive-evoked responses using laser stimuli in chronic migraine (CM) patients.
- To compare these responses with migraine without aura (MWA) patients and non-pain controls.
Main Methods:
- Utilized CO2 laser pulses to stimulate the right-supraorbital zone in 26 outpatients (16 CM, 10 MWA) and 15 controls.
- Performed source localization analysis on the P2 peak of laser-evoked potentials (LEPs).
- Projected P2 source locations onto a 3D MRI model for topographic analysis.
Main Results:
- The CM group exhibited significant differences in P2 dipole location compared to MWA patients and controls.
- In CM patients, the P2 dipole localized to the rostral cingulate cortex, a more posterior position within the anterior cingulate cortex (ACC) than in controls and MWA patients.
- The dipole's location correlated significantly with headache frequency.
Conclusions:
- Chronic migraine is associated with a unique pattern of cortical pain processing, specifically involving the rostral ACC.
- This distinct ACC activation may serve as a predisposing factor for the development of migraine chronicity.