Delphine Magis1, Marco Lisicki, Gianluca Coppola. 1. aHeadache Research Unit, University Department of Neurology CHR, University Hospital of Liège, Liège, Belgium bDepartment of Neurophysiology of Vision and Neurophthalmology, G.B. Bietti Foundation IRCCS, Rome, Italy.
Abstract
PURPOSE OF REVIEW: In migraine, the brain is 'hyperresponsive', which refers to a deficit of habituation to repeated sensory stimuli between attacks. This deficit normalizes in peri-ictal and ictal phases. A decreased cortical preactivation of thalamo-cortical origin and an impaired intracortical inhibition are probably involved in its pathophysiology. RECENT FINDINGS: The reality of a habituation deficit of visual evoked potentials, a neurophysiological 'hallmark' of interictal migraine, has been questioned. Blinding may be an issue, but some genetic, environmental, or behavioural differences could also exist between populations. A habituation deficit is found interictally in other sensory modalities, and strongly depends on the time of the recordings within the migraine cycle. An impaired thalamocortical drive is demonstrated in interictal phase, and normalizes in ictal phase as well as in chronic migraine, where a strength enhancement of primary cortical activation is observed. An interictal dysexcitability, of subcortical or primary cortical origin, is suggested by magnetic stimulation. These phenomena could occur in varying degrees depending on patients and on the migraine cycle, and account for the heterogeneity of electrophysiological results. SUMMARY: Finding a reliable electrophysiological biomarker for such a multifaceted and cycling disease as migraine is still a challenge. A better standardization of protocols would be worthwhile.
PURPOSE OF REVIEW: In migraine, the brain is 'hyperresponsive', which refers to a deficit of habituation to repeated sensory stimuli between attacks. This deficit normalizes in peri-ictal and ictal phases. A decreased cortical preactivation of thalamo-cortical origin and an impaired intracortical inhibition are probably involved in its pathophysiology. RECENT FINDINGS: The reality of a habituation deficit of visual evoked potentials, a neurophysiological 'hallmark' of interictal migraine, has been questioned. Blinding may be an issue, but some genetic, environmental, or behavioural differences could also exist between populations. A habituation deficit is found interictally in other sensory modalities, and strongly depends on the time of the recordings within the migraine cycle. An impaired thalamocortical drive is demonstrated in interictal phase, and normalizes in ictal phase as well as in chronic migraine, where a strength enhancement of primary cortical activation is observed. An interictal dysexcitability, of subcortical or primary cortical origin, is suggested by magnetic stimulation. These phenomena could occur in varying degrees depending on patients and on the migraine cycle, and account for the heterogeneity of electrophysiological results. SUMMARY: Finding a reliable electrophysiological biomarker for such a multifaceted and cycling disease as migraine is still a challenge. A better standardization of protocols would be worthwhile.
Authors: M Torres-Ferrús; F Ursitti; A Alpuente; F Brunello; D Chiappino; T de Vries; S Di Marco; S Ferlisi; L Guerritore; N Gonzalez-Garcia; A Gonzalez-Martinez; D Khutorov; M Kritsilis; A Kyrou; T Makeeva; A Minguez-Olaondo; L Pilati; A Serrien; O Tsurkalenko; D Van den Abbeele; W S van Hoogstraten; C Lampl Journal: J Headache Pain Date: 2020-04-29 Impact factor: 7.277
Authors: Marco Lisicki; Kevin D'Ostilio; Gianluca Coppola; Alain Maertens de Noordhout; Vincenzo Parisi; Jean Schoenen; Delphine Magis Journal: Front Neurol Date: 2018-05-30 Impact factor: 4.003