| 뇌졸증환자에서 광자극유발 등전위 분포도의 연구 |
| 이경덕, 최진영, 이현옥 , 권오상, 민병근 |
| 중앙대학교 신경과. |
| A Study of Topography of Flash VEP in Patients with Cerebrovascular Disease |
| Kyung Duk Lee, M.D., Jin-Yong Choi, M.D., Hyun-Ok Lee, M.D., Oh-Sang-Kwon, M.D., Byung-Kun Min, M.D. |
| Department of Neurology, College of Medicine, Chung Ang University |
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| Abstract |
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The auther studied the diagnostic usefulness of topography of flash visual evoked potential (FVEP) in evaluation of the patients with cerebrovascular diseases (CVDs) proven by brain CT scans. The patient group of 21 cases were consist of 10 cerebral infarctions and 11 intracerebral hemorrhages, that occurred at various sittes; 2 frontal lesions, 8 temporopariental lesions, 2 occipital lesions, and 8 basal ganglia lesions. As a control group, topographic studies of FVEP were done in 25 patients with no clinical eviddences of central nervous system diorders and visual symptoms.
Topographic studies of FVEP with 12 recording electrodes, using Topography
system 700 (San-ei), were done by binocular flashlight stimulation at the rate of 2/sec
with the eyes closed. Topographic studies of FVEP were evaluated visually and the
asymmetry of topography was considered as abnormal. Three types of topography were
used; spatial-temporal mapping up to 300 msec of latency, latency mapping of wave II
and VII (Cigenek, 1961), and amplitude mapping of wave II and VII. In both control
and patient group, FVEP recorded at O1 and O2 were also obtained.
The results were as follows: 1. In control group, absolute latencies and
amplitudes of wave II and VII were much variable in FVEP recorded at O1and O2.
Interhemispheric differences of amplitudes of wave II and VII were also much variable,
but those of latencies were the least variable parameters; 1.89+1.24 msec in wave II and
2.65+3.90 msec in wave VII. Interhemispheric differences of latencies and amplitudes in
patient group were interpreted as normal within the mean value plus 2 standard
deviation of those of control group. 2. In patient group, abnormal FVEP recorded at
O1 and O2 were observed only in 11 cases, among which 8 cases (38%) were consistent
in lateralization of supratentorial lesions on brain CT scans. 3. Spatial-temporal
mapping of FVEP, even in control group, was variable at each latencies, showing
shifting asymimetries sidde to side and only suggested the tendency of greater
amplitudes in right hemisphere and sequential transition of evoked responses. 4. In
patient group, 17 cases showed abnormal latency mapping of wave II an/or wave VII,
among which 13 (62%) were consistent in lateralization of supratentorial lesions. This
relatively high concordance rate to brain CT findings was thought to be resulted from
low variability of interhemispheric differences of latencies, and also suggested that
latency mapping is more reliable method than other 2 types of topography of FVEP. 5.
Amplitude mapping of wave II and/or wave VII showed 38% (8 cases) of concordance
rate to brain CT findings in lateralization of supratentorial lesion. In conclusion, it is
thought that topography of FVEP is a useful diagnostic test in evaluation of CVDs, and
is also suggested that topography of FVEP can be used in evaluation of various
supratentorial cerebral lesions functionally without such sophisticated criteria as in
conventional FVEP interpretation." |
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