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作者比较中风患者痛相关体感诱发电位(SEP)与电刺激SEP改变,研究这些改变与中风部位的关系。12例经CT或MRI证实的脑梗塞或脑出血患者(7男5女,平均67.5岁),无周围神经病史、感觉完全丧失及自发性疼痛者。痛相关SEP用特制的CO_2激光刺激器,刺激强度为使正常人产生痛觉,电刺激SEP强度为运动阈的20％。痛相关和电刺激SEP分别研究6例和7例正常对照者,P_(340)和N_(20)潜伏期正常上限定为正常对照者的均值+2.5SD,波幅较健侧降低50％以上为异常。中风部位与SEP异常:豆状核5例,丘脑3例,放射冠4例。豆状核损害者均有轻偏瘫并显示P_(340)、N_(20)异常。2例P_(340)缺如,3例潜伏期延长。P_(340)与N_(20)异常相对一致,但P_(340)缺如者只有
The authors compared stroke-related pain-related somatosensory evoked potential (SEP) with electrical stimulation of SEP to study the relationship between these changes and stroke sites. Twelve patients with cerebral infarction or cerebral hemorrhage confirmed by CT or MRI (7 males and 5 females, average 67.5 years) had no history of peripheral neuropathy, complete loss of sensation and spontaneous pain. Pain-related SEP with a special CO2 laser stimulator, stimulus intensity to make pain in normal people, electrical stimulation SEP intensity of 20% of the threshold for exercise. Pain-related and electrical stimulation of SEP were studied in 6 cases and 7 normal controls, P_ (340) and N_ (20) normal upper limit of normal control were defined as + 2.5SD, amplitude lower than the contralateral side of more than 50% . Stroke site and abnormal SEP: lenticular nucleus in 5 cases, thalamus in 3 cases, 4 cases of radial crown. Patients with lentiform nuclei had mild hemiparesis and showed P_ (340), N_ (20) abnormalities. 2 cases of absence of P_ (340), 3 cases of prolonged latency. The P_ (340) and N_ (20) anomalies are relatively consistent, but only those with P_ (340) absent