Headache
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Randomized Controlled Trial Multicenter Study
Enhanced pain expectation in migraine: EEG-based evidence for impaired prefrontal function.
Dysexcitability characterizes the interictal migraineous brain. The main central expressions of this dysexcitability are decreased habituation and enhanced anticipation and attention to pain and other external sensory stimuli. ⋯ Our findings of impaired modulation of anticipated pain in migraine suggest a heightened state of anticipatory readiness combined with ineffective recruitment of prefrontal inhibitory pathways during experience of pain; the latter might account for the former, at least partially. In line, less efficient inhibitory capability is a plausible mechanistic explanation for patients' high concern about their upcoming migraine attacks.
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Randomized Controlled Trial
Waning of "conditioned pain modulation": a novel expression of subtle pronociception in migraine.
To assess the decay of the conditioned pain modulation (CPM) response along repeated applications as a possible expression of subtle pronociception in migraine. ⋯ Migraineurs have subtle deficits in endogenous pain modulation which requires a more challenging test protocol than the commonly used single CPM. Waning of CPM response seems to reveal this pronociceptive state. The clinical relevance of the CPM waning effect is highlighted by its association with clinical parameters of migraine.
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Randomized Controlled Trial
Visual evoked potentials in interictal migraine: no confirmation of abnormal habituation.
We intended to study the effect of check size on visual evoked potential habituation in interictal migraine, using the faster 3 per second reversal rate and an improved analytic procedure with block-number blinding. ⋯ Reversal rate and check-size differences do not seem to explain the discrepant visual evoked potential habituation results in the migraine literature. Furthermore, no differences in first block amplitudes or N70, P100, and N145 latencies between healthy controls and migraineurs were found. We recommend blinded evaluation designs in future habituation studies in migraine.