Petter M Omland1, Martin Uglem2, Knut Hagen3, Mattias Linde3, Erling Tronvik3, Trond Sand3. 1. Norwegian University of Science and Technology, Department of Neuroscience, Trondheim, Norway. Electronic address: Petter.m.omland@ntnu.no. 2. Norwegian University of Science and Technology, Department of Neuroscience, Trondheim, Norway. 3. Norwegian University of Science and Technology, Department of Neuroscience, Trondheim, Norway; St. Olavs Hospital, Department of Neurology and Clinical Neurophysiology, Trondheim, Norway.
Abstract
OBJECTIVE: Lack of habituation is considered a neurophysiological hallmark of migraine. However, the results of visual evoked potential (VEP) studies have been discrepant, possibly because of different stimulation parameters and lack of blinding. Hence, there is a need for independent confirmation of lack of VEP habituation in migraine. In this blinded study we applied 16' checks to supplement our previous findings with 8', 31', 62' and 65' checks. METHODS: VEPs in 41 interictal migraineurs and 30 controls were compared. VEPs were recorded in six blocks of 100 single responses. Linear N70-P100 amplitude change over blocks (habituation slope) was compared with an independent samples Student's t-test. RESULTS: Amplitude decline over blocks was observed in both groups. Habituation slope was not significantly different between controls (-0.43 ± 0.54 μV/block) and migraineurs (-0.29 ± 0.35 μV/block) (p=0.33). CONCLUSION: VEP habituation with 16' checks did not differ in migraineurs and controls. This is in agreement with previous findings with other stimulation parameters. It is therefore unlikely that use of different stimulation parameters could explain the discrepant results of previous studies. No studies that applied blinding during recording of VEP have found lack of habituation in migraineurs. SIGNIFICANCE: Lack of VEP habituation cannot be considered a reliable neurophysiological hallmark in migraine.
OBJECTIVE: Lack of habituation is considered a neurophysiological hallmark of migraine. However, the results of visual evoked potential (VEP) studies have been discrepant, possibly because of different stimulation parameters and lack of blinding. Hence, there is a need for independent confirmation of lack of VEP habituation in migraine. In this blinded study we applied 16' checks to supplement our previous findings with 8', 31', 62' and 65' checks. METHODS: VEPs in 41 interictal migraineurs and 30 controls were compared. VEPs were recorded in six blocks of 100 single responses. Linear N70-P100 amplitude change over blocks (habituation slope) was compared with an independent samples Student's t-test. RESULTS: Amplitude decline over blocks was observed in both groups. Habituation slope was not significantly different between controls (-0.43 ± 0.54 μV/block) and migraineurs (-0.29 ± 0.35 μV/block) (p=0.33). CONCLUSION: VEP habituation with 16' checks did not differ in migraineurs and controls. This is in agreement with previous findings with other stimulation parameters. It is therefore unlikely that use of different stimulation parameters could explain the discrepant results of previous studies. No studies that applied blinding during recording of VEP have found lack of habituation in migraineurs. SIGNIFICANCE: Lack of VEP habituation cannot be considered a reliable neurophysiological hallmark in migraine.
Authors: Gianluca Coppola; Martina Bracaglia; Davide Di Lenola; Cherubino Di Lorenzo; Mariano Serrao; Vincenzo Parisi; Antonio Di Renzo; Francesco Martelli; Antonello Fadda; Jean Schoenen; Francesco Pierelli Journal: J Headache Pain Date: 2015-11-02 Impact factor: 7.277
Authors: Matthijs J L Perenboom; Maarten Schenke; Michel D Ferrari; Gisela M Terwindt; Arn M J M van den Maagdenberg; Else A Tolner Journal: Eur J Neurosci Date: 2020-11-26 Impact factor: 3.386