Effect of neck flexion on F wave, somatosensory evoked potentials, and magnetic resonance imaging in Hirayama disease.

Journal of Neurology, Neurosurgery, and Psychiatry
U K MisraA Hadique

Abstract

Flexion myelopathy is one of the suggested mechanism for Hirayama disease (HD) but simultaneous radiological and neurophysiological evaluation is lacking. This study therefore evaluates the effect of neck flexion in HD using somatosensory evoked potentials (SEPs), F waves, and magnetic resonance imaging (MRI). Eight HD patients and seven matched controls were subjected to median and ulnar F wave (minimal latency, FM ratio, persistence, and chronodispersion), and SEPs evaluating N9, N13, and N20 potentials in neutral and neck flexion. Spinal MRI was carried out in neutral and neck flexion and evaluated for cord atrophy, signal changes, cord compression, posterior epidural tissue, and loss of dural attachment. The patients were aged 19 to 30 years. Minimal F latency, FM ratio, persistence, and chronodispersion in neutral and neck flexion did not show any change nor was there any change in N13 latency and amplitude on median and ulnar SEPs. The difference in these parameters in neutral and neck flexion were also not significant in HD compared with controls. The change in N13 was also not related to loss of dural attachment and posterior epidural tissue. Neck flexion does not produce significant changes in N13 and F wave parameters...Continue Reading

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Citations

Oct 23, 2008·Neurological Sciences : Official Journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology·Angelo AmmendolaGioacchino Tedeschi
Nov 30, 2013·Journal of Neurosurgery. Spine·Igor ParedesJuan José Rivas
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Jul 15, 2011·Muscle & Nerve·Rong-Kuo LyuHong-Shiu Chang
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Jun 16, 2017·Amyotrophic Lateral Sclerosis & Frontotemporal Degeneration·Jayantee KalitaZafar Neyaz
Jan 8, 2021·Surgical Neurology International·Otto Hernandez FustesRosana Herminia Scola
Sep 12, 2021·Neurology India·Jayantee KalitaUsha K Misra

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