Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology
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Comparative Study
Decreased vasoreactivity to right cerebral hemisphere pressure in migraine without aura: a near-infrared spectroscopy study.
Several studies have reported changes in cerebrovascular reactivity during the interictal period of migraine. To characterize mechanisms of migraine, we compared changes in total haemoglobin (THbl) and regional oxygen saturation (rSO(2)) of the right and left frontal lobes in response to intracranial pressure changes during the interictal period of migraine. ⋯ The suppression of vasoreactivity in the right hemisphere might be related to the pathogenesis of migraine.
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Comparative Study
Effects of masticatory muscle fatigue without and with experimental pain on jaw-stretch reflexes in healthy men and women.
To examine the effects of experimentally evoked masticatory muscle fatigue, without and with experimental muscle pain, on the short-latency jaw-stretch reflex, using a randomised crossover design. ⋯ The sensitivity of the human jaw-stretch reflex can be modulated by HS-induced muscle pain; not by muscle fatigue that is provoked by intense chewing.
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Comparative Study
Sympathetic and parasympathetic activities evaluated by heart-rate variability in head injury of various severities.
To investigate the autonomic function in patients with brain damage of various extents. The purposes were to correlate the parameters derived from spectral analysis of the heart-rate variability (HRV) with the classic Glasgow coma scale (GCS), and to evaluate the possible clinical application of HRV in the autonomic functions in patients with various severities of brain-stem injury. ⋯ Our analysis indicates that HRV may be an useful tool for evaluating the autonomic functions in patients with brain damage of various degrees.
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Comparative Study
Lack of habituation of nociceptive evoked responses and pain sensitivity during migraine attack.
The aim of the present study was to investigate the habituation of subjective pain sensation to CO(2) laser stimulus, in relation to the amplitude modifications of the cortical evoked responses (LEPs), during both the migraine attack and the not symptomatic phase. ⋯ The reduced habituation of the nociceptive cortex may concur with the onset and evolution of headache.
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Changes in cardiovascular measures have been advocated as sensitive markers of phasic events arising from sleep. The current study was aimed to analyse the effects of periodic leg movements (PLMS) on heart rate variability (HRV) during NREM sleep in patients having restless legs syndrome and periodic leg movements during sleep. ⋯ Spectral HRV measures may offer a simple approach to estimate the degree of autonomic changes occurring in relation to periodic leg movements in restless legs patients.