蝎毒素Ⅳ的中枢镇痛作用

从东亚钳蝎粗毒中分离纯化出蝎毒素Ⅳ，经套管注入侧脑室，用辐射热测痛和屈肌反射检测两种方法，观察蝎毒素Ⅳ的中枢镇痛作用，结果蝎毒索Ⅳ可以明显延长大鼠缩腿潜伏期，并可显著抑制Ｃ纤维诱发的屈肌反射。提示蝎毒素Ⅳ具有显著的中枢镇痛作用。     

高频消融心室肌和心律失常的实验研究

应用2.59MHz的高频消融心室肌和兔实验性心律失常的兴奋灶。结果表明,高频可引起心肌局灶性凝固性坏死;高频消融乌头碱注射部位,可使实验性心律失常恢复正常的时间明显缩短。高频消融未见有并发症。     

急性缺氧对飞行员胃液排空功能的影响

为探讨急性缺氧对飞行人员胃液体排空功能的影响，在常压下吸入不同浓度氧（17％、16％、14％、12％、10．5％及9％）的低氧混合气体30min，采用B型超声波在实验前后分别测量了64名男性飞行员的胃液体排空功能。结果表明，吸入17％低氧混合气胃排空延迟，但经统计学处理无显著性差异（P＞0．05），吸入16％以下的低氧混合气后胃排空延迟，经统计学处理有显著性差异（P＜O．01），且随着缺氧程度加重，胃液体排空时间延长更加明显。提示当发生高空缺氧时，应考虑到缺氧对胃排空有抑制作用这一因素。     

维生素E对培养心肌细胞脂质过氧化损伤的保护

应用氢过氧化枯烯引发体外培养的乳鼠心肌细胞脂质过氧化损伤过程，观察了添加维生素Ｅ（２００ｍｇ／Ｌ的α－生育酚）的影响。结果显示：维生素Ｅ能明显减轻细胞脂质过氧化物的蓄积、细胞内肌酸激酶漏出和ＤＮＡ断裂，保护细胞膜流动性、肌球蛋白轻链肌酸激酶和头部ＡＴＰ酶的活性；但对￣３Ｈ－ＴｄＲ掺入的影响不显著。表明维生素Ｅ具有抵抗脂质过氧化所致心肌细胞损伤的作用。     

进展期胃癌患者手术前后外周血T细胞及其亚群变化的研究

目的:研究进展期胃癌患者外周血T细胞免疫功能状态,手术对T细胞免疫功能的影响,以及对术后免疫治疗的指导。方法:采用间接免疫荧光染色流式细胞仪检测法,对43例进展期胃癌患者作手术前后外周血T细胞及亚群的测定,17例健康人作术前正常对照组。结果:与对照组相比,术前患者CD_3~+、CD_4~+细胞及CD_4~+/CD_8~+比值显著减少(P<0.01),而CD_8~+细胞无差异(P>0.05)。9例行非根治术者,手术前后T细胞及亚群无明显变化;而34例行根治术者,术后除CD_8~+细胞无变化外,CD_3~+、CD_4~+细胞及CD_4~+/CD_8~+比值均较术前有显著提高(P<0.01或P<0.05)。结论:术前进展期胃癌患者外周血T细胞免疫功能低下,行根治性切除术后得以改善。术后辅助免疫治疗或免疫化疗,以期提高生存率。     

戊四氮诱发大鼠全身强直-阵挛性癫痫发作诱导丘脑c-fos癌基因表达

首次运用Fos癌蛋白抗体免疫组化法详细研究了戊四氮诱发大鼠全身强直-阵挛性癫痫发作诱导丘脑c-fos癌基因表达的动态分布。主要结果是:腹腔内注入戊四氮诱导大鼠癫痫发作后0.5h,丘脑室旁核出现低密度的Fos-免疫阳性(Fos-ir)细胞核标记;3h时,中等密度的Fos-ir标记扩布至大部分丘脑中线和板内核群及网状核;6h时,所有上述丘脑核群的Fos-ir标记普遍增为中等至高密度。结合文献报道,上述结果提示:丘脑室旁核很可能是戊四氮诱发大鼠全身强直-阵挛性癫痫发作的重要起源部位之一;丘脑中线和板内核群及网状核很可能在此种癫痫发作的病理生理机制中起重要作用。     

我国人体首次发现圆圃棘口吸虫病例及虫体形态观察

1988年7月6日,我们在一患者便内发现似姜片虫卵的大型虫卵。临床表现为头昏无力、食欲不振,上腹痛和贫血。因病人20天前有吞食活泥鳅史,故疑其为棘口吸虫病。服药后获虫体70条,经形态学研究,鉴定为圆圃棘口吸虫(Echinostoma hortense Asada,1926)。     

Pre-operative parenteral nutrition in patients with oesophageal cancer: a prospective, randomised clinical trial

A prospective randomised clinical trial was conducted to examine the efficacy of 2 weeks pre-operative parenteral nutrition (PPN) for the prevention of complications following surgery for oesophageal cancer. Forty patients were studied, the diet of twenty being supplemented by pre-operative parenteral nutrition. There were no significant differences in age, nutritional status, tumour staging and histology between the two groups of patients. The use of PPN resulted in a significant gain in body weight and nitrogen but failed to produce an overall reduction in post-operative morbidity and mortality rates. However patients receiving PPN exhibited two types of changes in serum albumin levels. Those with a fall in serum albumin levels associated with an increase in body weight (indicating an expansion of extracellular volume) had a significantly higher incidence of post-operative pulmonary complications than the group exhibiting a rise in serum albumin levels concomitant with increase in body weight. These data suggested that two weeks PPN might not be adequate in certain patients and a longer period of PPN is required. They also show no clinical benefit from the routine use of pre-operative parenteral nutrition in all patients, but do not exclude benefit in selected groups.     

A Study of Early Pregnancy Factor Activity in Preimplantation

PROBLEM and METHOD: Early pregnancy factor (EPF), an Immunosuppressive substance, which appears in pregnant women's sera 48 h after fertilization, is a kind of pregnancy-specific protein. To determine whether the EPF activity could be a super early indicator of pregnancy, we used rosette inhibition assay to detect EPF activity in the sera, collected from 70 women 2–7 days after ovulation intending to conceive monitored by ultrasonography. Simultaneously we selected 40 non-pregnant sera and 12 early-pregnant sera as negative control and positive control, respectively. RESULTS: The results of this study demonstrated that EPF activity is detected in 35 women's sera out of 70 women within 2–7 days after ovulation, and 28 women out of the 35 were pregnant, which was known by follow-up, and 7 were not pregnant, possibly due to either false positive results or embryo loss because of preimplantation failure, thus causing no pregnancy. The other 35 out of 70 had no EPF activity and 34 of them were not pregnant, which was known by follow-up, but one case became pregnant, which was false negative result. Our study showed that diagnosis of the super early pregnancy could be made by detecting EPF activity in maternal serum within the time of preimplantation. The accuracy of pregnancy diagnosis by this method is 88.6%, with a false negative rate of 3.4% and a false positive rate of 17.1%. The β-HCG level was measured from the above 70 women's sera in order to contrast EPF activity. All of the sera collected 2–6 days following ovulation indicated that there were lower β-HCG values in very early pregnancy (≥a5 mIU/ml). On the seventh day after ovulation, EPF activity was detected in 11 out of 15 sera with only 2 of them with a b-HCG level that reached or slightly surpassed that of the early pregnancy diagnosis (5 mIU/ml and 5.4 mIU/ml, respectively). This demonstrated that β-HCG is not the earliest signal of pregnancy; otherwise the EPF activity is one that appears 2–6 days earlier than β-HCG appears. We measured the progesterone level of the 48 sera from the 70 collected above within 2–7 days postovulation and found most of them reached the level of progesterone in the luteal phase (7.5–98.3 nmol/L). This indicated that ovulation had taken place in these women, which was in accordance with observations by ultrasonography. CONCLUSIONS: Our study showed that diagnosis (of 88.6%) of super early pregnancy could be made with an accuracy of 88.6% by detecting EPF activity in maternal serum within 2-days after ovulation. This offers a basis for pregnancy diagnosis for the women who attempt to terminate their pregnancy safely or who conceive unexpectedly, and it contributes to family-planning.