Structure-acute toxicity relationship of aromatic hydrocarbons in mice

The structure-acute toxicity relationship of aromatic hydrocarbons was examined in mice. In all test compounds, the acute toxicity was determined under 2 conditions: control LD₅₀ (LD₅₀-cont) and carbon tetrachloride (CCl₄)-pretreated LD₅₀ (LD₅₀-CCl₄). The CCl₄-pretreatment was done in order to evaluate the toxic potency of compound itself without the influence of metabolism. Both log (1/LD₅₀-cont) and log (1/LD₅₀-CCl₄) were functions of the log P, n-octanol/water partition coefficient, i.e., log (1/LD₅₀-cont) = 0.080 log P − 1.532 and log (1/LD₅₀-CCl₄) = −0.040(log P)² + 0.157 log P − 1.373. Both equations were statistically significant (P < 0.01). The ratio of LD₅₀-cont/LD₅₀-CCl₄ indicated that metabolic activation is more evident in hydrophobic compounds than in hydrophilic compounds. The results suggest that hydrophobicity of the aromatic hydrocarbons plays an important role in determining their acute toxicity.     

镍作业工人细胞免疫功能、血清硒和过氧化脂质含量的变化

９６名镍作业工人测定结果：非特异酯酶阳性细胞百分率（ＡＮＡＥ＋％）为７６．８％±８．０％，Ｔ细胞亚群ＣＤ２、ＣＤ４、ＣＤ８阳性细胞百分率（ＣＤ＋２％、ＣＤ＋４％、ＣＤ＋８％）及ＣＤ＋４／ＣＤ＋８比值分别为６５．６％±１０．５％、５６．３％±１２．１％、３４．３％±８．２％和１．７６±０．６；酵母多糖刺激的外周血多形核白细胞化学发光（ＰＭＮ－ＣＬ）本底和峰值分别为４８±２３和３０７３±６８４ＣＰＳ／１０６ＰＭＮ；血清硒和丙二醛含量分别为１．２２±０．２３和４．７６±０．８８μｍｏｌ／Ｌ。与非镍作业的地区对照组比较，Ｔ细胞ＣＤ＋８％增高，ＣＤ＋４／ＣＤ＋８比值下降，化学发光的本底值降低，峰值增加，血清Ｓｅ含量下降，丙二醛含量升高。分析镍作业工人工龄与后三项指标变化的关系，工龄大于２０年与小于１０年有统计学上明显差别。这些观察指标为镍作业人员医学观察增加新的监护指标提供依据。     

感染性心内膜炎手术时机的初步探讨

本文报道了15例感染性心内膜炎（IE）的外科治疗结果。左心IE9例，其中3例合并风湿性心脏病。右心IE6例，均合并先天性室间隔缺损（VSD）。活动性IE13例，静止期IE2例。右心IE的手术方法是修补VSD，剥除三尖瓣上的赘生物并涂以0.5％活力碘，环缩三尖瓣环。左心IE的处理方法为瓣膜置换。手术死亡2例。本文着重对手术时机进行了讨论。     

烧伤血清刺激对大鼠肠上皮细胞结构和粘弹性的影响

目的　动态观察烧伤血清对体外肠上皮细胞 (IEC)骨架和细胞生物力学 (粘弹性 )的影响。　方法　培养大鼠肠上皮细胞株IEC 6 ,用烧伤血清刺激后 ,通过细胞骨架免疫组化、细胞ELISA法定量分析以及粘弹性测定技术 ,动态观察IEC致伤前后的变化。　结果　IEC在烧伤血清作用早期 ,骨架蛋白的表达即明显降低 ,微丝、微管蛋白阳性信号减弱 ,细胞粘弹性下降。　结论　细胞骨架的损伤可引起细胞脆性增加、粘弹性下降 ,导致细胞生物力学特性的改变。这种变化 ,可能直接参与烧伤后肠上皮细胞损伤的发生。     

重庆市正常青少年牙列指数测量分析

目的建立重庆市正常牙合青少年牙颌模型牙列指数的正常值,为正畸临床提供依据.方法选取重庆市正常牙合青少年牙颌模型92付(男45付,女47付),测量牙冠宽度、牙弓宽度,计算Bolton指数和Pont指数,对测量结果进行统计分析并与国内外相关资料进行对比研究,对Bolton指数和Pont指数的临床应用价值进行评价.结果Bolton指数和Pont指数存在种族和地区差异,结论Bolton指数和Pont指数在正畸临床中均有一定的应用价值,临床上应参照本民族和地区的标准.     

山西省卫Ⅳ项目地区农民因病致贫研究

目的 研究项目地区农民因病致贫严重程度及预防措施。方法 利用扩展线性支出系统界定贫困标准，观察因病致贫率并研究因病致贫人群特点。结果 农民因病致贫率3．44％，因病致贫人群收入低，健康状况差，馒性病患病率高。2周就诊和年住院率高，年家庭医疗费用支出远高于对照人群。结论 通过住院医疗保险和慢性病防治措施缓解农民因病致贫。     

Surgical treatment of primary small cell carcinoma of the esophagus. Clinical analysis of 11 cases]

545 cases of esophageal carcinoma were confirmed histologically and by esophagoscopic biopsy between Jan. 1982 and May 1990. Primary small cell carcinoma was identified in 19 cases. Of 11 patients confirmed operatively, 5 had oat cell carcinoma, 4 combined oat cell carcinoma and 2 intermediate cell carcinoma. The mean overall survival period was 13.9 months. The longest survival period was 27 months. The prognosis of primary small cell carcinoma was poorer than that of squamous carcinoma of the esophagus because of its propensity of spread and metastasis. Once the diagnosis of small cell carcinoma was established, surgery was undertaken as early as possible. For patients who had lymph node metastasis at the time of diagnosis, we recommended surgical treatment plus systemic chemotherapy after operation. To increase the resection rate, it is important to do chest CT scan, bronchiofiberscopy and B-type ultrasonography before operation.     

县级医院经济活力及其与不同奖金制度之间的关系分析

该利用山东省县级医院普查资料，通过比较性分析方法，对奖金制度转变和医院经济活力之间的关系进行了分析。研究结果表明：在过去的20年中，医院经济活力得到了较大提高，奖金制度转变有利于医院提高经济活力。     

重度联合免疫缺陷小鼠的繁育及其应用初报

应用带过滤罩的透明鼠在层流柜内繁育Ｔ和Ｂ淋巴细胞缺失的重度联合免疫缺陷（ｓｃｉｄ）小鼠获得成功，１９９３年５月至１９９４年４月，共繁育ｓｃｉｄ小鼠２２１只，寿命均超过１２个月。平均每窝产仔数为５．５只，显著低于对照组ＢＡＬＢ／ｃ小鼠，不育率为１４．９％，离乳率为８８．２％，与ＢＡＬＢ／ｃ小鼠相比均无明显差异。ｓｃｉｄ小鼠４～１０周龄的体重与同龄ＢＡＬＢ／ｃ小鼠相比无明显差异，微生物学检测均符合ＳＰ     

Neuromuscular block with vecuronium reduces the rapidly extracted auditory evoked potentials index during steady state anesthesia

PURPOSE: During clinical monitoring, vecuronium appeared to reduce the rapidly extracted auditory evoked potentials index (A-line ARX index or AAI) to some extent. A prospective and randomized study was designed to analyze this phenomenon. METHODS: Forty adult patients undergoing elective surgery were studied. After tracheal intubation, anesthesia was maintained with an end-tidal isoflurane concentration (F(ET)ISO) of 1.0% for 20 min, then a 10-mL dose of either vecuronium 0.05 mg*kg(-1), 0.1 mg*kg(-1), 0.2 mg*kg(-1) or saline was administered in a randomized, double-blind design. The AAI and bispectral index (BI(hx)) were monitored throughout the study and analyzed off-line. RESULTS: BI(hx) was unaltered after the administration of saline or vecuronium. The mean of the averaged (per patient) AAI values recorded from two minutes to ten minutes after the administration of saline or vecuronium 0.05 mg*kg(-1) did not differ significantly from the corresponding mean recorded from 15 min to 20 min after F(ET)ISO maintained 1.0% (P = 0.678, 0.169), however after the administration of vecuronium 0.1 mg*kg(-1) or 0.2 mg*kg(-1), AAI was reduced from 18.3, 18.0 to 14.8, 13.4 (P = 0.016, 0.017). CONCLUSIONS: Neuromuscular block with vecuronium reduces AAI in patients during steady state anesthesia without surgical stimuli, while BI(hx) is unaltered. The cut-off values of AAI for events should be determined according to the level of neuromuscular blockade when monitoring the depth of anesthesia/sedation.