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Published on: June 2, 2014
Absence of haemodynamic refractory effects in patients with migraine without aura: an interictal fMRI study
Benedicte Descamps1, Pieter Vandemaele, Harmen Reyngoudt
1Ghent University, Belgium. Benedicte.Descamps@UGent.be
Background:
In healthy controls, haemodynamic refractory effects are observed with blood-oxygenation-level dependent (BOLD) functional MRI (fMRI): the haemodynamic response function (HRF) to the second stimulus in a pair of stimuli with short interstimulus interval (ISI) shows a decreased amplitude and an increased time-to-peak. We hypothesize that there may be interictal haemodynamic abnormalities in migraineurs.
Methods:
An event-related fMRI design with paired face stimuli and varying ISIs was used to measure interictal HRFs in the face recognition area of patients with migraine without aura (MwoA) and controls. Net responses to the second stimulus in a pair were calculated and averaged per participant. Several characterizing parameters of the net responses were quantified and examined within each group.
Results:
Refractory effects were not observed in our patient group. There are no changes in the net responses compared with the reference situation in patients, irrespective of the ISI, whereas in controls all HRF parameters are decreased or delayed for an ISI of 1 second.
Conclusion:
This is the first fMRI study investigating the haemodynamic refractory effects in MwoA patients. Unlike in controls, these effects are not observed in migraineurs. Although currently unclear, it is tempting to speculate that this observation reflects the neurovascular correlate of lack of habituation measured with evoked potentials in migraineurs.
Insights
Migraineurs without aura do not exhibit normal hemodynamic refractory effects, unlike healthy controls. This fMRI study suggests potential neurovascular differences in migraine patients, possibly linked to habituation deficits.
Area of Science:
- Neuroimaging
- Neuroscience
- Medical Imaging
Background:
- Healthy individuals show hemodynamic refractory effects in blood-oxygen-level dependent (BOLD) functional MRI (fMRI).
- These effects include decreased amplitude and delayed peak in the hemodynamic response function (HRF) to repeated stimuli.
- Hypothesized interictal hemodynamic abnormalities in migraineurs warrant investigation.
Purpose of the Study:
- To investigate interictal hemodynamic refractory effects in migraineurs without aura (MwoA) using fMRI.
- To compare HRF responses between MwoA patients and healthy controls.
Main Methods:
- Event-related fMRI design with paired face stimuli and varying interstimulus intervals (ISIs).
- Measurement of interictal HRFs in the face recognition area.
- Quantification and comparison of net response parameters between MwoA patients and controls.
Main Results:
- Hemodynamic refractory effects were absent in MwoA patients.
- No significant changes in net responses were observed in patients across different ISIs.
- Healthy controls exhibited decreased amplitude and delayed peak in HRF parameters at a 1-second ISI.
Conclusions:
- This is the first fMRI study to demonstrate the absence of hemodynamic refractory effects in MwoA patients.
- The findings suggest a potential neurovascular correlate for the lack of habituation observed in migraineurs.
- Further research is needed to elucidate the implications of these observed differences.
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