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抄録 植物状態患者において,各種誘発電位測定による電気生理学的な検討を行い,CTによる形態学的観察との比較検討を加えた。対象は厚生省班研究の基準を満たす植物状態患者(persistent vegetativestate, PVS)22例であり,原因疾患の内訳は,脳動脈瘤破裂3例,脳内出血5例,脳梗塞6例,頭部外傷3例,低酸素症4例,脳腫瘍1例であった。誘発電位として聴性脳幹反応(auditory brainstem response, ABR)短潜時体性感覚誘発電位(short latency somatosensory evoked potential, SSEP)視覚誘発電位(visualevoked potential, VEP)の測定を行い,同時期に施行したCT所見とともに,太田らのPVSの重症度分類ごとに比較検討した。結果は①ABRに比べ,SSEP, VEPはPVSの重症度をより良好に反映していた。②CT所見では,脳室拡大よりも上部脳幹萎縮および異常低吸収域の存在の有無が重症度の指標として有用であった。
The auditory brainstem response (ABR), short latency somatosensory evoked potential (SSEP) and visual evoked potential (VEP) of patients in the persistent vegetative state (PVS) are reported, and the correlations between the electrophysiolo-gical findings and the CT scan findings with the three clinical grades of the PVS (transitional, incomplete and complete vegetative syndromes) are discussed.
Twenty two patients in a vegetative state cau-sed by subarachnoid hemorrhage (3), hypertensiveintracerebral hemorrhage (5), cerbral infarction (6), head injury (3), cerebral anoxia (4) and brain tumor (1).
Each evoked response was evaluated for the presense or absence of abnormalities and assigned a grade ranked I to III. Briefly an evoked re-sponse was assigned a grade I, II,III if it satisfied the respective criteria of normal, moderately abnormal and severely abnormal or absent electri-cal activity.
On the other hand CT scan findings in the PVS were evaluated for abnormal low density areas, ventricular dilatation and enlargement of the sulci and cisterns indicative of atrophy of the brain parenchym.
SSEP and VEP were better correlated with the clinical grade than ABR, and upper brainstem atrophy and abnormal low density area in CT scan findings were more valuable as an index to expresses the clinical features than ventricular dilatation.
On the basis of these results, it is concluded that studies of ABR, SSEP and VEP associated with CT scan findings in the PVS could be a useful diagnostic aid to evaluate the lesions of these patients.
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