Acta neurologica Scandinavica. Supplementum
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Acta Neurol. Scand., Suppl.c · Jan 2009
What is chronic headache in the general population? The Akershus study of chronic headache.
Studies of chronic headache including both primary and secondary causes from the general population is lacking. ⋯ Primary and secondary chronic headaches are common in the general population.
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Acta Neurol. Scand., Suppl.c · Jan 2009
Visual evoked potential and spatial frequency in migraine: a longitudinal study.
Reduced habituation of visual evoked potentials (VEP) has been reported in migraine. We aimed to study if preattack excitability changes were related to check size using a paired longitudinal design. ⋯ Cortical excitability is high in MA. Headache severity affects visual excitability. Increased P1N2 VEP amplitude before the attack suggests a cyclic decreased intracortical inhibition in extrastriate magnocellular pathways in migraine.