Visual cortex excitability and plasticity associated with remission from chronic to episodic migraine

Wei Ta Chen, Shuu Jiun Wang*, Jong Ling Fuh, Yu Chieh Ko, Yi Chung Lee, Matti S. Hämäläinen, Yung Yang Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Objective: Previous magnetoencephalographic (MEG) studies showed different P100m (where 'm' denotes the magnetic counterpart of P100 in conventional visual evoked potentials) responses between episodic migraine (EM) and chronic migraine (CM) interictally. This study investigated the changes of visual P100m in CM patients who remitted to EM from CM after treatment.Methods: At baseline, 25 patients with CM were studied interictally. For each patient, 30 sequential blocks of 50 P100m responses were obtained by MEG. Sub-averaged amplitudes at blocks 2, 9, 16, 23 and 30 were further compared with that at block 1 to assess response habituation or potentiation (i.e. significant decrease or increase at either block vs block 1). The same study was repeated in those patients who remitted from CM to EM after topiramate treatment.Results: In total, 10 CM patients remitted to EM after treatment. In the follow-up study of these patients during the interictal stage, the P100m at block 1 decreased in amplitude from 53.6 ± 6.6 nAm before remission to 43.0 ± 5.1 nAm (p = 0.028), and the responses at subsequent blocks switched from habituation (amplitude block 30 < block 1 before remission, p = 0.011) to potentiation (block 2 > block 1, p = 0.028).Conclusion: The pattern of P100m responses to consecutive stimulation changes with the transition from CM to EM. Visual cortex plasticity might be a potential biomarker reflecting clinical remission of CM.

Original languageEnglish
Pages (from-to)537-543
Number of pages7
JournalCephalalgia
Volume32
Issue number7
DOIs
StatePublished - May 2012

Keywords

  • Migraine
  • chronic migraine
  • magnetoencephalography
  • topiramate
  • visual cortical excitability
  • visual evoked magnetic field

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