铁缺乏症对婴幼儿智能发育的影响

为分析铁缺乏症(IDD)对婴幼儿智能发育的影响，随机抽取了6个月至3岁婴幼儿200例，按有否铁缺乏分组，比较了其与智能的关系。结果表明，铁缺乏症检出率为17．5％，铁缺乏组婴幼儿智能发育商(DQ)明显下降，与正常组比较差异有显著性，铁缺乏程度越重，DQ值越低。可见铁缺乏症对婴幼儿大脑发育造成不良影响，对该症无贫血阶段及轻度缺铁性贫血期(IDA)应予重视。     

浅析广州市花都区预防梅毒母婴传播的实施成效

目的了解花都区开展预防梅毒母婴传播阻断项目的实施成效,降低梅毒母婴传播率。方法对首次就诊的孕产妇进行梅毒筛查,对检出的梅毒阳性孕产妇进行规范治疗,并对其所生婴儿进行随访管理。结果 2012—2016年感染产妇孕期确诊率达71.18%,接受规范治疗率达53.02%,新生儿预防性治疗率75.8%,儿童3月龄梅毒检测率为50.86%,6月龄检测率42.55%。结论实施预防梅毒母婴传播项目,可以有效地阻断梅毒的母婴传播,降低梅毒母婴传播率,提高妇女儿童的健康水平。     

A Population Dynamics Model with Parental Care

A model for an agestructured unlimited population dynamics with parental care of offspring is presented (migration of individuals is not taken into account). The model consists of six partial integrodifferential equations for single males, single females, pairs with offspring under parental care, pairs without offspring under parental care, and offspring of the male and female sex. A class of separable solutions is constructed.     

Beginners’ progress in early arithmetic in the Swedish compulsory school

This article focuses on spontaneous knowledge-building in the field of “the arithmetic of the child.” The aim is to investigate the conceptual progress of fifteen children during their early school years in the compulsory school. The study is based on the epistemology of radical constructivism and the methodology of “multiple clinical interviews”. A model of “the arithmetic of the child” elucidates mental structures used by the child in solving problems. The individual interviews are video-recorded. The results show that the children's solutions are compatible with the model. When the researcher adapts problems to the children's available concepts to bring out their capability, they all solve them in their own ways. Further, the conceptual levels of the children differ to a great extent at school start and do not all show conceptual progress after 2 years of traditional teaching. An implication for an alternative teaching process is suggested, namely “the arithmetic for the child”, accomplished in a triadic teaching process.     

Large-Time Behavior in Population Dynamics with Offspring Production at Fixed Ages,Child Care,and Spatial Dispersal

We present a density-dependent population dynamics model with age-dependence, child care, and spatial dispersal. The population consists of the young (under maternal care), juvenile, and adult (producing offsprings at fixed ages or of post-reproductive age) classes. Death moduli of the juvenile and adult individuals are decomposed into two-term sums. The first sum represents the death rate by natural causes and by those that do not depend on the population spatial density, while the other one describes the environmental influence depending on the spatial density of the juvenile and adult individuals. The steady-state and a class of separable solutions are considered, and the large-time behavior of separable solutions is analyzed for the stationary vital rates. The asymptotic behavior of nondispersing semelparous species is also examined.     

数字减影血管造影引导下双侧子宫动脉栓塞术在穿透性凶险性前置胎盘中的应用

本文分析了数字减影血管造影（DSA）引导下双侧子宫动脉栓塞术在穿透性凶险性前置胎盘患者中的应用效果及对母婴结局的影响。选择2017年12月～2019年7月我院收治的穿透性凶险性前置胎盘患者45例,依据是否行子宫动脉栓塞术,将患者分为观察组（n=25例）和对照组（n=20例）。观察组行DSA引导下双侧子宫动脉栓塞术治疗,对照组行常规剖宫产手术治疗。术后7天对患者效果进行评估,比较两组手术指标、母婴结局及并发症发生率。结果显示：观察组失血量、红细胞输血量、冷沉淀输血量、住院时间,少（短）于对照组,新生儿1 min Agpar评分高于对照组,差异有统计学意义（P<0.05）。观察组新生儿肺炎、新生儿呼吸窘迫综合征、新生儿窒息及新生儿高胆红素血症发生率均低于对照组,差异有统计学意义（P<0.05）。观察组子宫切除、产后出血、失血性休克和DIC发生率均低于对照组,差异有统计学意义（P<0.05）。表明DSA引导下双侧子宫动脉栓塞术治疗穿透性凶险性前置胎盘的效果确切,可明显减少患者术中出血量及术后并发症,降低手术风险,改善临床结局,且微创、安全,值得临床推广应用。     

清远市学龄前儿童血铅水平分析

目的　探讨清远市学龄前儿童血铅水平、铅中毒分布特点及与其它元素的关系,为防治铅中毒损害提供依据,方法　在清远市城区,随机抽取在清远市妇幼保健院体检的5 5 3名1～6岁儿童为研究对象,采指端末梢血2 0 μL ,用原子吸收光谱仪测定血铅、钙、锌、铁、铜和锰的水平。结果　该市学龄前儿童血铅水平( 73 0±49 6) μg/L ,几何均值5 8 1 μg/L ,铅中毒流行率2 4 95 % ,以1 0 0～1 90 μg/L频率最高,占2 3 6% ,铅中毒流行率随年龄的增长而降低( χ2 =1 2 0 9,P <0 0 5 ) ;2岁组铅中毒流行率最高,血铅值与血钙、锌值呈显著负相关(r =-0 1 82 ,-0 1 5 0 ,P <0 0 5 )。结论　2岁组对铅污染较敏感;增加钙、锌元素的补充,能预防儿童铅中毒     

急性心肌梗死患者D-二聚体、cTnT及心肌酶谱联合检测的临床意义

为探讨急性心肌梗死患者D-二聚体、肌钙蛋白及心肌酶谱联合检测的临床意义,选择30例健康者（对照组）和100例患者（病例组）进行D-二聚体、肌钙蛋白及心肌酶谱（AST、LDH、CK、CK-MB）检测,并把100例患者（病例组）分为3组,分别为36例AMI组,34例不稳定型心绞痛（UAP）组,30例稳定型心绞痛（SAP）组。结果表明,AMI组及UAP组中D-二聚体、肌钙蛋白及心肌酶谱（AST、LDH、CK、CK—MB）的升高程度较SAP组和健康对照组显著增高（P〈0．05）;AMI组肌钙蛋白（cTnT）较UAP组明显增高（P〈0．05）;UAP组肌钙蛋白（cTnT）较对照组明显增高（P〈0．05）;D-二聚体、肌钙蛋白及心肌酶谱（AST、LDH、CK、CK—MB）的升高程度与心肌梗死的面积正相关（P〈0．01）。提示D-二聚体、肌钙蛋白及心肌酶谱（AST、LDH、CK、CK—MB）联合检测有助于急性心肌梗死诊断的提高。     

An Age-Structured Population Dynamics Model with Females' Pregnancy and Child Care

We present a deterministic model for an age-structured population dynamics taking into account females' pregnancy, maternal care of offsprings, and environmental pressure with or without spatial migration. The model is based on the age-density notion for a group formed by a mother and her offsprings under maternal care. A harmonic-mean-type mating function of sexes without formation of permanent pairs is used. It is assumed that each sex has the pre-reproductive, reproductive, and post-reproductive age intervals. All adult individuals are divided into males, single females, fertilized females, and females taking child care. Individuals of post-reproductive age belong to the group of singles. All individuals of pre-reproductive age are divided into the young and juvenile groups. Only young offsprings are assumed to be under maternal care. Juvenile individuals can live without maternal care. The model consists of integro-PDEs subject to the conditions of integral type. The existence and uniqueness theorem is proved in the case of unlimited population. Separable solutions and their long-time behavior are studied for the limited nondispersing population. In the case of random migration two types of separable solutions and their long-time behavior for the homogeneous Dirichlet and Neumann boundary conditions are studied. In the case of directed migration in one-dimensional domain with special initial and Dirichlet boundary conditions, the unlimited invasive population dynamics is studied. In particular, an explicit formula for the migration front is given.     

弱视儿童血清微量元素的检测分析

为探讨弱视和微量元素之间的关系,对71例5~10岁的弱视儿童进行了血清微量元素Zn、Fe、Cu、Ca、Mn、Pb含量的检测,并与130例同龄正常儿童比较。结果表明,弱视儿童血清Zn含量明显低下,而Pb、Ca、Mn含量明显升高,与正常儿童比较差异均有显著性(P<0.01);Fe、Cu含量两组间差异无统计学意义(P>0.05)。弱视女童血清Mn含量比男童高,两组间比较差异有统计学意义(P<0.05);而男女童Zn、Fe、Cu、Ca、Pb含量间差异无统计学意义(P>0.05)。提示弱视儿童部分血清微量元素异常,对弱视成因有一定影响,建议重视并及时纠正儿童异常的微量元素。