Somatosensory findings in patients with spinal cord injury and central dysaesthesia pain.

OBJECTIVE: To determine whether central pain in patients with spinal cord injury is only dependent on the lesioning of spinothalamic pathways. METHODS: In sixteen patients with spinal cord injury and central dysaesthesia pain, somatosensory abnormalities in painful denervated skin areas were compared with somatosensory findings in normal skin areas as well as in non-painful denervated skin areas. RESULTS: The threshold values for detection of thermal (heat, cold, heat pain, or cold pain) and tactile stimulation were significantly changed in denervated skin areas although there were no significant differences in the threshold values between painful and non-painful denervated skin areas. The reductions of sensations of touch, vibration, joint position, and two point discrimination in painful and non-painful denervated skin areas were not significantly different. Allodynia (pain caused by non-noxious stimulation) and wind up-like pain (pain caused by repeatedly pricking the skin) were significantly more common in painful than non-painful denervated skin areas. CONCLUSIONS: Because pain and thermal sensory perception are primarily mediated to the brain via spinothalamic pathways, whereas the sensations of touch, vibration and joint position are primarily mediated by dorsal column-medial lemniscal pathways, the results indicate that central pain is not only dependent on the lesioning of either dorsal column-medial lemniscal pathways or spinothalamic pathways. The findings of abnormal evoked pain (allodynia and wind up-like pain) may be consistent with the experimental findings of hyperexcitability in nociceptive spinothalamic tract neurons, that may be involved in the pathogenesis of central pain.     

Quantitative observation by enzyme cytochemistry of human rectal adenocarcinoma cells killed by LAK cells

Activity of succinic dehydrogenase(SDH)and acid phosphatase(AcPase)of effector-target cells during the process of LAK cells killing HR8348 cells was estimated by enzyme cyto-chemistry technique.SHD positive granules and AePase gray level were assayed with MIAS-300image analyser.The results showed:(1)After cocultivation of effector and target cells for vari-ous times,the activity of AcPase of HR8348 cells was apparently higher than that of the controlgroup,and it increased following prolonged coincubation.SDH activity of target cells increasedmarkedly within 30 and 60 rain cocultivation,but became low after 90 min treatment.(2)Ac-Pase content within LAK cells at 60,90,120,180 and 240 rain cocultivation was significantlyhigher than that of control group(P<0.01).The phenomenon of high AcPase and SDH activitywithin effector-target cells indicates that the function of the two types of cells was in an activestate.At the early stage of effector-target combining,the increase of SDH with HR8348 cellsmay be related to defensive function of the target cells.Higher AcPase activity of target cells in-dicates the activation of lysosomal enzyme which serves as the material basis for autolysis of thecells.     

Acquired hepatocerebral degeneration: MR similarity with Wilson disease

Acquired hepatocerebral degeneration (AHD) is a neurologic syndrome occurring in the presence of chronic hepatic disease, which results in permanent neurologic aberrations. The syndrome shares many of the clinical manifestations of Wilson disease, however, distinction can be made with slit lamp examination and biochemical studies. Cranial magnetic resonance (MR) imaging of a patient with AHD revealed increased signal intensity in the dentate nuclei bilaterally on T2-weighted images indistinguishable from Wilson disease. The MR findings of Wilson disease as described in the literature are not specific and further investigation with slit lamp examination and biochemical studies is warranted to distinguish between the two entities.     

轴突分叉点位置计算法适用性的分析

某些中枢神经元通过分叉轴突向两个以上核团投射。轴突分叉点的位置通常由计算轴突主干传导时间予以估测。但是,本工作用该法的4个公式计算细胞内或细胞外记录到的数据未能得到一致和可信的数值。结果提示,计算法的原理是不合理的,并至少对在细胞内或细胞外记录条件下估测轴突分叉点是不适用的。     

Polymyositis-dermatomyositis:25 years of follow-up of 50 patients disease course, treatment, prognostic factors

Therapeutic results were analysed in 50 patients, including 17 with polymyositis (PM) and 30 with dermatomyositis (DM). All patients were treated with prednisone (Encorton, Polfa) and 47% of patients with PM and 73% with DM required combined treatment with prednisone and cytostatic agents, mostly with cyclophosphamide (Endoxan G.D.R.). Long-term treatment monitored with the clinical status led to remissions persisting after treatment discontinuation in 17.6% of PM patients and 24.2% of DM patients. In 64.7% of PM patients and 57.6% of DM patients regression of the clinical signs of the disease was achieved but these patients required further treatment. No information was obtained on 5 cases. Four DM patients died. The cumulative 17-year survival rate of PM patients was 100%, and that of DM patients was 78.8% . In 45 follow-up cases, the mortality was 8.9%. Side effects of the combined treatment included most frequently mucosal candidiasis (22.2%), transient leucopenia (14.8%) and recurrent respiratory tract infections (11.1%). In 5 cases liver biopsy was done and histological examination disclosed moderate fatty, glycogen and vacuolar degeneration of the hepatocytes. The statistical analysis of prognostic factors such as the diagnosis of PM or DM, sex, age at disease onset, disease duration till diagnosis establishing and beginning of treatment, fever, dysphagia, circulatory and respiratory changes, leucocytosis nad ESR at the beginning of the disease showed that sex (female), older age at disease onset and respiratory system changes may be accepted as poor prognosis factors.     

脂肪族聚酯与高氯酸锂络合物的结构与导电性

本文通过酯交换反应合成了一系列脂肪族聚丁二酸酯,对他们的结构和性能作了表征。发现聚酯存在多晶现象,其熔点有奇偶性变化规律。探索了由此系列聚酯与高氯酸锂形成的固体电解质的结构和离子导电性。无机盐的加入提高了电解质的玻璃化温度但降低了聚酯的熔点及结晶度。聚酯电解质的晶体类似于聚酯,其无机盐主要溶解于聚酯的无定形区域。聚酯系列电解质的导电率也有偶奇效应,与熔点变化相反;熔点高的电解质导电率低,熔点低的电解质导电率高。电解质的导电率随温度改变而变化,在室温下电解质的导电率可达10~(-6)s/cm。高分子链上侧基的引入将大大降低电解质的导电性。     

Acetylcholine-induced currents in denervated mouse soleus muscle: effects of antagonists.

Acetylcholine-induced currents were measured in partially depolarized mouse soleus muscles, denervated for 3-6 days by using a point voltage clamp. When 0.25 microM d-tubocurarine (d-Tc) was used, the weak currents provoked by 0.1 microM ACh, at a holding potential of -20 mV, were barely affected, while the large currents provoked by 2-5 microM ACh were decreased by more than 50%. By contrast, weak and strong ACh-induced currents were proportionally diminished when, under similar conditions, 20-100 microM ipratropium was used. Currents were proportionally diminished by d-Tc when the holding potential was set at +15 mV, a level corresponding to the reversal potential of the current provoked by small concentrations of ACh. In non-denervated flexor digitorum brevis muscles, d-Tc had the same relative effect at small and at large concentrations of ACh, independent of the holding potential. The reversal potential for the ACh-induced currents was about +14 mV for small concentrations of ACh and decreased to about +3 mV with 4 microM ACh in denervated soleus muscles. It was concluded that denervated soleus muscles, in contrast to the endplate regions of non-denervated mouse muscles, contain a small proportion of highly ACh-sensitive, weakly d-Tc-sensitive, predominantly Na(+)-permeable ACh receptors. These receptors are presumably responsible for the non-fading ACh-induced currents, described before, for the denervated mouse soleus muscle.     

Transient proliferative diabetic retinopathy during intensified insulin treatment

Two women aged 22 and 19 years who had had diabetes for 11 and four years, respectively, developed proliferative retinopathy after five to seven months of significantly improved metabolic control. They were participants in two separate prospective studies including 97 insulin-dependent patients. At inclusion, one patient showed minimal background retinopathy and the other showed no retinopathy. Their level of glycosylated hemoglobin was initially high (14.3% and 17.5%) but within five to six months had fallen by 5.7% and 7.5%. The improved metabolic control was obtained by home blood glucose monitoring and insulin pump in the older patient and by home blood glucose monitoring only in the other. By maintaining near normoglycemia, regression of the proliferative retinopathy was achieved. Photocoagulation was not performed. After five and two years of follow-up, respectively, only mild background retinopathy has been noted in both patients. We concluded that a significant lowering of blood glucose may provoke proliferative retinopathy and that sustained good metabolic control may reverse this retinopathy without photocoagulation.     

薄层扫描法检测血清、尿中磺胺甲唑和甲氧苄氨嘧啶

本文建立了血清、尿中ＳＭＺ和ＴＭＰ的薄层扫描定性定量检测方法。血清和尿中ＳＭＺ的线性检测范围为４～１２８μｇ／ｍｌ，最小检出浓度为１．６μｇ／ｍｌ；ＴＭＰ的线性检测范围为１～３２μｇ／ｍｌ，最小检出浓度为０．８μｇ／ｍｌ。     

豚鼠脑干听觉中枢和内侧膝状体GABAA受体β亚单位的分布

目的：研究豚鼠脑干听觉中枢内侧膝状体ＧＡＢＡＡ受体β亚单位的分布。方法：采用免抗ＧＡＢＡＡ受体β亚单位血清和免疫组织化学ＡＢＣ法及葡萄糖氧化酶－ＤＡＢ－镍成色技术。