Funct Neurol
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Prospective and retrospective studies showed that headaches (migraine and tension-type) with childhood or adolescent onset have age-related characteristics and change over time, with high rate of type changing, remission or improvement. The reasons are unknown. On the other hand, several studies focused on factors that may be precursors of childhood headaches. ⋯ Familial (genetic?) influence, hyperreactivity, periodic syndromes and anxiety in childhood are factors that may predict headache onset, against the background of developmental modulation of pain. Biological and psychological factors are probably reciprocally involved, although the link is unclear. The identification of prognostic factors could allow a better framing of headaches and, from an integrated perspective, have important implications as regards clarifying the "nature" of headache.
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The cerebral circulation is innervated by sympathetic, parasympathetic and sensory nerves which store a considerable number of neurotransmitters. The role of these has been evaluated in primary headaches. ⋯ In parallel with sumatriptan treatment head pain subsided and neuropeptide release normalised. These data show the involvement of sensory and parasympathetic mechanisms in the pathophysiology of primary headaches.
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Amplitudes of early wave contingent negative variation (iCNV) reveal significant differences between migraine patients and healthy controls, indicating a lack of habituation and pronounced attentional functions in migraine patients. CNV amplitudes were recorded in 20 migraine patients. ⋯ The data show an influence of duration of migraine disease on iCNV amplitudes. It is suggested that iCNV is an indicator of chronicity in persistent migraine.
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It is well known that migraine with aura may coexist with various unilateral headaches, like cluster headache and chronic paroxysmal hemicrania. It may also coexist with cervicogenic headache. The diagnosis of migraine without aura ("common migraine") poses greater problems than the diagnosis of migraine with aura. ⋯ The mean number of cervicogenic headache criteria was 4.3 (out of a total of 5) in the "cervicogenic part of the picture", as opposed to 1.5 (1.8 if laterality is considered, see text) in the "migraine part of the picture". Drug regimens and anaesthetic blocks also showed different results in the two different headaches in the same patient. All in all, this study seems to support a coexistence of the two headache types.
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We investigated cortical excitability and the pattern of arousal in migraine patients using contingent negative variation (CNV) and EEG power spectrum analysis performed before and after a migraine attack. Twenty females suffering from migraine without aura and 12 healthy controls were enrolled in the study. In the group of patients, the CNV, EEG power spectrum and hemispheric asymmetry analyses were performed 1-4 days before the first day of an attack and 4 days following the last day with migraine. ⋯ The abnormalities in cortical excitability and arousal were only observed before an attack, and could be used to predict the next migraine episode. We assume that these changes reflect the increased susceptibility of the migrainous brain to precipitating factors and the neurophysiological readiness to generate an attack. The time duration since the last attack must be taken into account when performing studies in the field of migraine research.