Nofal M Khalil1, Alessia Nicotra, Arnold J Wilkins. 1. Department of Clinical Neurophysiology, West London Neurosciences Centre, Imperial College Healthcare NHS Trust and Charing Cross Hospital, London, UK. n.khalil@imperial.ac.uk
Abstract
BACKGROUND: Asymmetry of visual phenomena and headache is an important feature of migraine with aura. METHODS: This asymmetry was explored by assessment of visual illusions, hemifield spatial contrast detection (HCD) and hemifield pattern reversal visual evoked potentials (HVEPs) in 47 migraineurs with aura (MA), who were not taking prophylactic medications, and 62 controls with the same age range (16-59). RESULTS: Illusions were greater and HCD was poorer in MA than in controls. There were no group differences with respect to P100 amplitude. The longer the duration of migraine the poorer the HCD. When the aura was consistently unilateral it was associated with greater illusions, reduced HCD and reduced hemifield P100 amplitude. These findings were not related to the side of headache. CONCLUSION: The lateralised changes suggest that the visual dysfunction occurs at a cortical level, and the correlation with the side of the aura suggests that dysfunction is most likely to occur in an area of preexisting anomaly of neural function.
BACKGROUND: Asymmetry of visual phenomena and headache is an important feature of migraine with aura. METHODS: This asymmetry was explored by assessment of visual illusions, hemifield spatial contrast detection (HCD) and hemifield pattern reversal visual evoked potentials (HVEPs) in 47 migraineurs with aura (MA), who were not taking prophylactic medications, and 62 controls with the same age range (16-59). RESULTS: Illusions were greater and HCD was poorer in MA than in controls. There were no group differences with respect to P100 amplitude. The longer the duration of migraine the poorer the HCD. When the aura was consistently unilateral it was associated with greater illusions, reduced HCD and reduced hemifield P100 amplitude. These findings were not related to the side of headache. CONCLUSION: The lateralised changes suggest that the visual dysfunction occurs at a cortical level, and the correlation with the side of the aura suggests that dysfunction is most likely to occur in an area of preexisting anomaly of neural function.
Authors: Anders Hougaard; Faisal Mohammad Amin; Michael B Hoffmann; Egill Rostrup; Henrik B W Larsson; Mohammad Sohail Asghar; Vibeke Andrée Larsen; Jes Olesen; Messoud Ashina Journal: Hum Brain Mapp Date: 2013-09-03 Impact factor: 5.038
Authors: Inge H Palm-Meinders; Enrico B Arkink; Hille Koppen; Souad Amlal; Gisela M Terwindt; Lenore J Launer; Mark A van Buchem; Michel D Ferrari; Mark C Kruit Journal: Neurology Date: 2017-10-11 Impact factor: 9.910