Prenatal lead exposure in relation to gestational age and birth weight: A review of epidemiologic studies

Although the adverse effect on pregnancy outcomes at high levels of lead exposure in the workplace has been recognized for years, there is uncertainty regarding the impact of exposure at the lower community exposure levels commonly encountered today. This review summarizes the epidemiologic literature and discusses pertinent methodologic issues and possible sources of interstudy variation. The authors conclude that prenatal lead exposure is unlikely to increase the risk of premature membrane rupture but does appear to increase the risk of preterm delivery. Whether prenatal lead exposure decreases gestational age in terms of infants is unclear. Prenatal lead exposure also appears to be associated with reduced birth weight, but results vary in relation to study design and degree of control for confounding. Adjustment for gestational age, a possible confounder of the birth weight-lead exposure association, did not yield clearer results.     

Prototype system for an MR simulation of intracavitary brachytherapy for cervical cancer: Preliminary results in six cases

We report a newly developed MR simulation system for intracavitary brachytherapy for cervical cancer and subsequent treatment results. MR simulation was performed on six patients. The spatial relationship of the tumor to the bladder, rectum, bowel, applicators, etc. was depicted well. Doses to the tumor and surrounding normal tissues were read from isodose curves superimposed on the T2-weighted sagittal image. This system promises to be useful in customizing the dose distribution.     

Serotonergic projections from the midbrain periaqueductal gray and nucleus raphe dorsalis to the nucleus parafasccicularis of the thalamus

By a double-labeling method combining the retrograde tracing of horseradish peroxidase and the immunocytochemical technique, serotonin-like immunoreactive neurons in the midbrain periaqueductal gray (PAG) and nucleus raphe dorsalis (DR) of the rat were observed to send projection fibers to the nucleus parafascicularis of the thalamus bilaterally with an ipsilateral dominance. These serotonin-containing projecting neurons were observed mainly at the middle-caudal levels of the ventrolateral subdivision of the PAG and less at the middle-rostral levels of the DR.     

老年病人鼻饲方法的改进

目的探讨增加置管深度并抬高床头对预防老年鼻饲病人食物反流的效果。方法将 5 75例需鼻饲的卧床老年病人按鼻饲医嘱时间顺序及不平衡指数最小原则分成三组 ,分别给予教科书中的常规置管深度置管 (对照组 )、置管深度延长 10cm(观察 1组 )、置管深度延长 10cm并抬高床头 30～ 45°(观察 2组 )进行鼻饲。结果三组病人食物反流率比较 ,P <0 .0 1;观察 1、2组分别与对照组比较 ,P <0 .0 5、P <0 .0 1;观察 1组与观察 2组比较 ,P <0 .0 1。增加置管深度并抬高床头其食物反流率最低 ,仅增加置管深度次之 ,常规置管最高。结论增加置管深度并抬高床头可显著降低老年鼻饲病人食物反流发生率。     

“津血同源”“肾为唾”的研究

以23例肾功能不全与20例肾功正常患者的唾液尿素氮、钠、钾、舌面pH值和血液的相应生化检查作对照。结果唾液尿素氮、钾与血尿素氮、钾成正相关性。证实了中医“津血同源”“肾为唾”的理论。     

Rhabdomyoma of the heart with intrapericardial expansion

A rare case of a rhabdomyoma originating from the surface of the right atrium in a 20-year-old female is reported. The tumor showed electrical activity and caused both outflow obstruction and tamponade symptoms. It was successfully removed by a right-sided thoracotomy. The clinical course, diagnostic investigations, and the therapeutical approach of this rare lesion are discussed.     

"五四"新文学的内倾化形态

这种形态的文学其最为显著的标志是内倾化即自剖，暴露作家的思想观念，心灵情绪直到作家的私生活，包括作家的性心理与性行为等在一般社会眼中视为卑微的东西。作家们弘扬个人的心灵欲望，宣泄“食与色”的双重焦虑与痛苦，其思想内涵无疑带有强烈的反封建色彩。其批判的向度指向内外两个方面，既有对自我心灵严酷的审视，又有对于社会与国家的无情拷问。     

一种简易的O_2与CO_2混合气体配制方法

一种简易的Ｏ_２与ＣＯ_２混合气体配制方法陈德森，付守芝，魏文芳，崔礼敬（郧阳医学院药理教研室十堰４４２０００）在科研及教学中所做的离体器官实验均需通９５％Ｏ２＋５％ＣＯ２或９７Ｏ２％＋３％ＣＯ２的混合气体，但这两种混合气体大多数地区不易购到，有介绍用...     

Atypical Allergic Colitis in Preterm Infants

ABSTRACT. Two atypical cases of colitis due to cow's milk protein intolerance (CMPI) are reported, affecting preterm infants. One developed a toxic dilatation of the colon and responded well to a casein hydrolysate based feed. The second presented insidiously and failed to tolerate a casein hydrolysate, but responded well to a chicken-based modular feed.     

Corpectomy for multi-level cervical spondylosis and ossification of the posterior longitudinal ligament

The choice of a surgical approach for multi-level cervical spondylotic myelopathy (CSM) and ossification of the posterior longitudinal ligament (OPLL) is still a controversial issue. While most of the surgeons are still performing decompression by laminectomy some are doing multi-level anterior decompression. Few neurosurgeons are performing decompression by corpectomy. We have treated 26 patients by median cervical corpectomy during the last 4 years. These patients were followed up for a mean period of 25 months. Twenty one (80%) patients had a good outcome, 2 patients remained unchanged and 3 expired. Review of the literature and our experience indicates that patients with CSM and OPLL should be operated by median cervical corpectomy (anterior approach).