Ictal Nystagmus by Epileptic Activation of Cortical Smooth Pursuit System: Electrophysiological and Neuroimaging Study
Journal of the Korean Neurological Association
;
: 465-471, 2004.
Article
in Korean
| WPRIM
| ID: wpr-186491
ABSTRACT
BACKGROUND:
Epileptic nystagmus is rare. There is no report in Korea about epileptic nystagmus by the activation of cortical smooth pursuit area. We studied a 29-year-male patient with nonconvulsive simple partial status epilepticus presenting as pure ictal nystagmus.METHODS:
The EEG including electrooculogram and electronystagmogram during ictus was done. Brain MRI including (99m)Tc-ECD SPECT and 18F-FDG PET were also done during ictus and repeated after complete relief from symptom. Subtraction images obtained from each of SPECT and PET were coregistrated onto MRI. Humphrey visual field test was done for documentation of visual field defect.RESULTS:
EEG was compatible with nonconvulsive status epilepticus arising from right mesial occipital area with 9-10 Hz frequency. Compensatory left beating nystagmus with midline crossing feature was noted and characteristic ipsiversive linear slow phase was presented in electronystagmogram. Brain neuroimages from MRI, (99m)Tc-ECD SPECT, and 18F-FDG PET revealed that the right parietotemporooccipital area was relevant area, but the right frontal eye field area was spared, which was much clear in SISCOM image.CONCLUSIONS:
Clinical feature and electronystagmogram in this case showed typical epileptic nystagmus by activation of cortical smooth pursuit regions in which the relevant regions was posterior parietotemporooccipital area. The sparing of the frontal eye field area in this case suggested clearly that the epileptic nystagmus by the activation of cortical smooth pursuit regions could occur without involvement of frontal eye field area.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pursuit, Smooth
/
Status Epilepticus
/
Brain
/
Magnetic Resonance Imaging
/
Visual Fields
/
Tomography, Emission-Computed, Single-Photon
/
Fluorodeoxyglucose F18
/
Electroencephalography
/
Electrooculography
/
Visual Field Tests
Limits:
Humans
Country/Region as subject:
Asia
Language:
Korean
Journal:
Journal of the Korean Neurological Association
Year:
2004
Type:
Article
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