Role of Maternal Antibodies in Infants with Severe Diseases Related to Human Parechovirus Type 3

Human parechovirus type 3 (HPeV3) is an emerging pathogen that causes sepsis and meningoencephalitis in young infants. To test the hypothesis that maternal antibodies can protect this population, we measured neutralizing antibody titers (NATs) to HPeV3 and other genotypes (HPeV1 and HPeV6) in 175 cord blood samples in Japan. The seropositivity rate (>1:32) for HPeV3 was 61%, similar to that for the other genotypes, but decreased significantly as maternal age increased (p<0.001). Furthermore, during the 2014 HPeV3 epidemic, prospective measurement of NATs to HPeV3 in 45 patients with severe diseases caused by HPeV3 infection showed low NATs (<1:16) at onset and persistently high NATs (>1:512) until age 6 months. All intravenous immunoglobulin samples tested elicited high NATs to HPeV3. Our findings indicate that maternal antibodies to HPeV3 may help protect young infants from severe diseases related to HPeV3 and that antibody supplementation may benefit these patients.     

重庆市彭水县0~2岁婴幼儿喂养现状及其影响因素

目的了解重庆市彭水县0~2岁婴幼儿喂养现状,探讨其影响因素。方法采用方便抽样,对重庆市彭水县县城中7个社区及8个乡镇中606名0~2岁婴幼儿的母乳喂养情况和半固体食物引入时间进行问卷调查,调查数据录入Epidata3.1数据库,采用SPSS19.0软件进行统计分析。结果 4月龄内婴儿纯母乳喂养率为63.6%,6月龄内婴儿纯母乳喂养率为35.3%,63.9%的婴幼儿在出生24h后开奶。大部分婴幼儿蔬菜、水果、谷类、蛋类、豆类、禽畜类、鱼类添加过晚。多因素Logistic回归分析显示,婴幼儿居住地为乡镇,开奶时间较早,是婴儿4月龄内纯母乳喂养的保护因素;喂养人年龄40岁,母乳喂养知识得分优秀者,是婴儿4月龄内纯母乳喂养的危险因素。结论调查地区婴幼儿喂养中开奶不及时,纯母乳喂养率和持续时间有待提高,半固体食物添加月龄不合理,添加过晚现象严重,应向家长提供正确喂养婴幼儿知识指导。     

早产低出生体重儿幼儿期注意发展特点研究

目的探讨早产低出生体重对幼儿注意发展的影响以及正常出生体重儿童注意发展的特点,以便及早制定实施有效的干预策略。方法本研究的对象为16.5~31月龄早产低出生体重儿32名和足月正常出生体重(normal birth weight,NBW)儿童53名。采用录像回放法评估儿童的注意时间,包括专注注意和偶然注意的时间,并给予注意等级评定,工具采用"电子琴、厨房玩具"两组玩具,每组自由玩耍480s,全程摄像。结果 1)正常幼儿注意时间:NBW幼儿在自由玩耍"玩具1、玩具2"各480s时,总的专注注意短于偶然注意时间(t=2.37,P0.01)。男、女童之间的注意时间、注意等级评估差异无统计学意义。2)低出生体重儿组注意时间:与NBW幼儿相比早产低出生体重幼儿对玩具2的偶然注意时间较长,差异有统计学意义(t=-2.31,P0.05)。按注意等级评估,早产组和对照组差异无统计学意义。结论正常出生体重幼儿专注注意时间短于偶然注意时间;早产低出生体重组幼儿对操作性强的玩具偶然注意时间短于正常组幼儿。     

早产儿喂养不耐受肠道菌群多样性研究

目的：采用变性梯度凝胶电泳聚合酶链反应（ PCR－DGGE）技术从微生物生态学的角度分析比较喂养不耐受（ FI）与健康早产儿肠道细菌群落结构的多样性及相似性。方法以2013年11月至2014年9月在第四军医大学附属唐都医院儿科新生儿病房诊断为FI的早产儿为FI组。选择与FI组胎龄、日龄、出生体重相匹配的非FI早产儿作为对照组。采集出现FI时和同时间段对照组的粪便标本,进行16SrDNAV3区扩增和变性梯度凝胶电泳（DGGE）,从而分析比较两组间肠道菌群多样性指数及相似性。结果细菌多样性检测显示FI组的肠道菌群多样性指数香农－维纳指数（H）、丰度（S）、均衡度指数（E）和辛普森多样性指数（D）均低于对照组（均P＜0．05）;相似性矩阵图及聚类分析结果显示组内菌群相似性较组间高（P＜0．05）;PCA结果同聚类分析一致。结论肠道微生物群落多样性的改变及群落结构紊乱可能是引起早产儿FI的重要因素。     

Factors influencing extrauterine growth retardation in singleton-non-small for gestational age infants in China: A prospective multicenter study

BackgroundThe incidence of extrauterine growth retardation (EUGR) varies considerably in different countries due to the distinct definitions and inclusion criteria of individual studies. Most studies included small for gestational age (SGA) very preterm infants (VPIs), resulting in a higher incidence of EUGR. Experts have suggested the accurate definition of “EUGR” in SGA infants is not “true EUGR”. The postnatal growth curve of multiple premature births also differs from that of singletons. As far as we know, there is no study about relationship between singleton-non-SGA preterm infants and EUGR.ObjectivesTo analyze the factors influencing EUGR among VPIs who were singleton-non-SGA in China.MethodsA prospective-multicenter study was conducted in 28 hospitals distributed through China from September 2019 to December 2020. The clinical data on singleton-non-SGA among VPIs were divided into EUGR group (n = 692) and non-EUGR group (n = 912).ResultsCompared to non-EUGR group, the mean gestational age (GA), mean birth weight (BW) and percentage of BW in Fenton curve in EUGR group were lower (P < 0.001 for all). The incidence of EUGR among distinct GA groups (classifications of GA < 28weeks, 28–28⁺⁶ weeks, 29–29⁺⁶ weeks, 30–30⁺⁶ weeks and 31–31⁺⁶ weeks) and distinct BW groups (classifications of BW<1000 g, 1000–1249 g, 1250–1499 g, 1500–1999g and 2000–2500 g) were statistically significant (P = 0.004 and P <.001). Logistic regression analysis indicated that later addition of human milk fortifier (HMF), later attainment of HMF sufficient fortification, later return to BW, more accumulative days of fasting, longer duration of parenteral nutrition, total duration of oxygen support and moderate/severe bronchopulmonary dysplasia (BPD) were risk factors for the development of EUGR in singleton-non-SGA VPIs (P < 0.001, P = 0.002, P < 0.001, P = 0.002, P = 0.017, P = 0.003 and P = 0.002, respectively). The use of full-course antenatal steroids, greater BW as a percentile of the Fenton curve, breastfeeding initiation and faster average velocity of weight growth effectively protected against EUGR (P = 0.008, P < 0.001, P < 0.001 and P < 0.001, respectively).ConclusionsThe overall incidence of EUGR was 43.1% among singleton-non-SGA VPIs in China. Raising the full-course antenatal steroids usage, reducing the incidence of moderate and severe BPD, attaching importance to the management of enteral nutrition in VPIs and increasing the weight growth velocity can reduce the incidence of EUGR.     

早产儿支气管肺发育不良的表型演变

支气管肺发育不良(bronchopulmonary dysplasia,BPD)是早产儿最常见的慢性肺部疾病,与婴儿死亡率、呼吸系统发病率增加有关。随着新生儿重症医学取得进展的同时,BPD的表型已从主要影响晚期早产儿、肺纤维囊性变演变为主要影响胎龄小于28周的超早产儿、肺实质受损和血管生长失调。文章评估了BPD定义演变、病理生理演变、影像演变及临床表型的演变特点,以期寻找新的循证预防和管理策略,改善疾病表型分类,早期识别高危早产儿的临床特点,以改善其预后。     

Mechanics of the ventilatory system in sedated infants: forced oscillations versus single-breath method

The real--Re(Z)--and imaginary--Im(Z)--parts of the ventilatory system impedance were measured between 6 and 30 Hz in 18 normal infants and in 19 with airway obstruction. The intercept (R0) and slope (S) of the Re(Z)-frequency function, as well as inertance (I) and compliance (C) estimated from Im(Z), were compared with ventilatory system resistance (Rrs) and compliance (Crs) (single-breath method). R0 correlated significantly with Rrs (r = 0.86), although the slope of the regression equation was significantly lower than 1 (P less than 0.01). Negative frequency dependence of Re(Z) was observed in all subjects and a significant correlation was found between S and Rrs (r = -0.80). "Inertance" was negative in 20 subjects and correlated negatively with Rrs (r = -0.61). C correlated with Crs (r = 0.64) and with 1/Rrs (r = 0.85). The ratio of C to Crs (mean +/- SD = 0.168 +/- 0.082) also correlated with 1/Rrs (r = 0.51). The main characteristics of the total impedance/frequency function could be simulated with a model featuring the upper airway wall (Zuaw) in parallel with the ventilatory system (Zrs). It is suggested that the differential change in Zuaw and Zrs with growth accounts for the marked frequency dependence of Re(Z) as well as the inaccurate estimation of both I and C in this population.     

Effects of a clinically detectable PDA on pulmonary mechanics measures in VLBW infants with RDS.

We examined the effect of a clinically detectable patent ductus arteriosus (PDA) and its successful treatment with indomethacin on serial measures of pulmonary mechanics in 10 very-low-birthweight (VLBW) intubated infants with respiratory distress syndrome (RDS). Pulmonary mechanics were measured by the passive expiratory flow technique. Total respiratory system compliance (Crs) gradually improved as RDS resolved. However, a significant decrease in mean Crs was associated with the development of a clinically detectable PDA, ranging from 1.51 +/- 0.21 to 0.90 +/- 0.08 mL/cmH2O/m (P less than 0.05). We also noted an increase in mean Crs, from 0.90 +/- 0.08 to 1.49 +/- 0.21 mL/cmH2O/m (P less than 0.05), after successful treatment of a PDA with indomethacin. Total respiratory system resistance (Rrs) did not change. We conclude that a clinically significant PDA is associated with a decreased Crs and that successful treatment of a PDA with indomethacin is associated with an improvement in lung compliance. These findings imply that the development of a clinically detectable PDA and its subsequent treatment complicates the interpretation of pulmonary mechanics data in VLBW infants with RDS.     

A comparison of spontaneous and CSF added CFU-MG colony formation in healthy,sick and hypotrophic pre-term infants

Summary Myelopoietic progenitor cells (CFU-MG) have been studied from peripheral blood of healthy, sick, and hypotrophic pre-term infants. Methylcellulose cultures were prepared simultaneously with and without exogenous colony stimulating factor. It was found that large numbers of circulating CFU-M are present at birth in healthy infants, smaller numbers in sick infants, and very few in hypotrophic infants. Exogenous CSF increases the number of colonies in cultures of healthy infants at birth. A limiting factor in spontaneous colony formation is the production of CSF by the cells in culture. This is particularly evident in sick infants. During the postnatal course similar levels of circulating CFUc, higher than in adult blood, are found in all three groups of pre-term infants.Supported by grants from the Deutsche Forschungsgemeinschaft (Pr 75/8) and from the Niedersächsisches Ministerium für Wissenschaft und Kunst     

Gastro-oesophageal reflux in infancy

Gastro-oesophageal reflux (GOR) is a common phenomenon in infants, which may occur with or without accompanying symptoms. Although most infants presenting with regurgitation have a normal physical examination, it is now recognized that infants may also present with a wide variety of symptoms. Oesophagitis is associated with increased oesophageal acid exposure. The determination of cause and effect is difficult, as there are many aspects of reflux disease where cause and effect relationships are cyclic. Reflux disease is present when there is an imbalance between a number of factors that can contribute to a decrease, as well as an increase, of GOR. Oesophageal pH monitoring with a semi-disposable monocrysant antimony pH catheter with three sensors is very good at documenting oesophageal acidification and gastric buffering and, therefore, quantifies acid reflux frequency and duration. However, the interpretation of the data is complex as they are influenced by numerous factors, such as position, activity (sleep, crying), feeding (frequency and composition) or medication. The duration of buffering of gastric acidity during pH monitoring might, in the future, appear to be a relevant factor in the interpretation of oesophageal pH data.