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Asymmetries in the vestibular control of balance following stroke
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Marsden, J. F., Playford, E. Diane and Day, B. L. (2005) Asymmetries in the vestibular control of balance following stroke. Journal of Neurology, Neurosurgery and Psychiatry, 76 (5). p. 29. doi:10.1136/jnnp.2004.046565
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Official URL: http://dx.doi.org/10.1136/jnnp.2004.046565
Abstract
OBJECTIVES:
To examine vestibular control of balance in those who recovered the ability to stand after middle cerebral artery (MCA) stroke.
METHODS:
Sixteen patients with MCA stroke were compared with 10 age matched controls. Two additional patients were studied with isolated corticospinal tract lesions, one each at the level of the pons and medulla. Vestibular evoked postural responses were obtained using galvanic vestibular stimulation (GVS) while patients stood with their eyes closed and head facing forwards, equally loading both legs. The GVS response was characterised by measuring the amplitude of the stimulus evoked lateral forces acting through each leg and the lateral displacement of the axial skeleton.
RESULTS:
Lateral displacement and net lateral force following GVS were significantly larger after stroke. Unlike controls, the lateral forces in the stroke group were asymmetrical, being enhanced on the side of the non-paretic limb and small on the side of the paretic limb. The degree of GVS evoked asymmetry correlated with corticospinal damage assessed using transcranial magnetic stimulation. A similar asymmetrical response was seen in the patient with the pontine lesion but not the patient with the medullary lesion.
CONCLUSIONS:
MCA stroke may disrupt corticobulbar projections to brainstem output pathways involved in vestibular control of balance. These projections are either collaterals of the corticospinal tract or lie close to that tract and terminate in the pons/upper medulla. This hypothesis accounts for the association between corticospinal tract damage and GVS response asymmetry, and the lack of GVS evoked asymmetry with corticospinal lesions below the rostral medulla.
| Item Type: | Journal Article | ||||
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| Divisions: | Faculty of Medicine > Warwick Medical School > Health Sciences > Statistics and Epidemiology Faculty of Medicine > Warwick Medical School |
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| Journal or Publication Title: | Journal of Neurology, Neurosurgery and Psychiatry | ||||
| Publisher: | B M J Group | ||||
| Place of Publication: | Inst Neurol, MRC, Human Movement Grp, Sobell Dept Motor Neurosci & Movement Disorders, London WC1N 3BG, England and UCL Natl Hosp Neurol & Neurosurg, Dept Therapy & Rehabil, London WC1N 3BG, England | ||||
| ISSN: | 0022-3050 | ||||
| Official Date: | May 2005 | ||||
| Dates: |
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| Volume: | 76 | ||||
| Number: | 5 | ||||
| Page Range: | p. 29 | ||||
| DOI: | 10.1136/jnnp.2004.046565 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Open Access | ||||
| Open Access Version: |
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