目的:分析并总结本新生儿重症监护室(neonatal intensive care unit,NICU)极早和超早产儿的救治现状及支气管肺发育不良(bronchopulmonary dysplasia,BPD)发病情况。方法:回顾性分析2018年1月—2020年12月南京医科大学附属儿童医院新生...目的:分析并总结本新生儿重症监护室(neonatal intensive care unit,NICU)极早和超早产儿的救治现状及支气管肺发育不良(bronchopulmonary dysplasia,BPD)发病情况。方法:回顾性分析2018年1月—2020年12月南京医科大学附属儿童医院新生儿医疗中心收治的胎龄<32周且出院日龄≥28 d共547例早产儿的临床资料,按临床诊断分为BPD组(n=126)和非BPD组(n=421),综合比较两组早产儿的情况,并纵向分析、总结3年的临床资料及BPD情况。结果:BPD组胎龄为(28.57±1.49)周,胎龄<28周的超早产儿占31.7%,而非BPD组胎龄为(30.05±1.39)周,超早产儿仅占8.1%(P<0.05)。BPD组出生体重(1132.18±251.25)g,<1000 g的超低出生体重儿占28.6%,而非BPD组出生体重(1384.47±267.44)g,超低出生体重儿仅占6.4%(P<0.05)。BPD组5 min Apgar评分≤7分、产房复苏率均升高(P<0.05)。非BPD组使用肺表面活性物质(pulmonary surfactant,PS)者第1次使用剂量显著大于BPD组(P<0.05),≥2次使用率低于BPD组(P<0.01)。BPD组有创及无创通气比例、通气持续时间及肺出血发病率均显著升高(P均<0.001),住院时间及总费用均高于非BPD组(P<0.05)。纵向分析,3年BPD总发病率为23.0%,2019年最高(28.8%),2018年最低(15.3%),差异有统计学意义(P<0.05);有创机械通气比例、超早产儿及超低出生体重儿比例均无显著差异(P>0.05),但2018年超低出生体重儿的平均体重显著高于其他年份(P<0.05)。结论:应加强对超早产儿及超低出生体重儿早期病情的监测及跟踪,重视PS的早期规范化应用,以进一步减少BPD,改善临床预后。展开更多
Acoustically absorptive treatment in aircraft engine nacelle is an essential part of the overall aircraft noise reduction effort. The investigation on the optimization of multi-liners plays an important role in noise ...Acoustically absorptive treatment in aircraft engine nacelle is an essential part of the overall aircraft noise reduction effort. The investigation on the optimization of multi-liners plays an important role in noise reduction. Based upon the mode analysis method of sound propagation in a circular duct with multiple liners, a flexible tolerance method is used to optimize the acoustic parameters(impedance), geometric structure parameters(such as open area ratio, cavity depth and hole diameter) and operating condition parameters(such as blade passing frequency). The mathematical models for these kinds of optimization are presented here. The optimum values of the design variables are determined when the in-duct sound suppression approaches a maximum. It can be derived from the optimum results that the emphasis of the engineering optimization design of the perforated plate honey-comb structure should be placed on the optimum choice of the open area ratio and cavity depth. Some reference criteria for the engineering design of the multi-linings are also provided.展开更多
本文报告了1例HADHB基因复合杂合变异导致的致死型线粒体三功能蛋白缺乏症(mitochondrial trifunctional protein deficiency,MTPD)。患儿生后24 h内起病,以“吃奶少伴心肌酶异常”为主诉在生后第4天转至南京医科大学附属儿童医院。入...本文报告了1例HADHB基因复合杂合变异导致的致死型线粒体三功能蛋白缺乏症(mitochondrial trifunctional protein deficiency,MTPD)。患儿生后24 h内起病,以“吃奶少伴心肌酶异常”为主诉在生后第4天转至南京医科大学附属儿童医院。入院时体格检查见精神稍萎靡,反应尚可,心肺腹无明显异常;实验室检查肌酸激酶同工酶及肌钙蛋白均偏高,心电图提示窦性心动过速、肢导联低电压;血液代谢筛查提示十四烯酰基肉碱及多种3-羟基肉碱均偏高;全外显子组测序结果示胎儿HADHB基因复合杂合变异[c.739C>T(p.Arg247Cys)和c.607C>T(p.Arg203Ter,272)]。随访至3月龄,患儿受凉后出现吃奶差、精神差,再入院后出现心力衰竭、呼吸衰竭等多脏器功能障碍表现,经治疗无效后死亡。致死型MTPD较为罕见,目前无有效治疗措施,预后差。对于新生儿期出现不明原因心肌病、低血糖、酸中毒等代谢异常表现,应警惕致死型MTPD可能,新生儿期基因检测可早期明确诊断。展开更多
Lithium ion-doped polyglycerol sebacate scaftbld（PGS）-Li was synthesized by adding lithium ions to po- lyglycerol sebacate（PGS） during its crosslinking process due to the specific effects of lithium ions on period...Lithium ion-doped polyglycerol sebacate scaftbld（PGS）-Li was synthesized by adding lithium ions to po- lyglycerol sebacate（PGS） during its crosslinking process due to the specific effects of lithium ions on periodontal li- gament cells, cementoblasts and the eminent performance of PGS. The molecular mass, composition, structure, porosity, thermal properties, and hydrophilicity of the composite were characterized by gel permeation chromatogra- phy（GPC）, Fourier transform infrared spectroscopy（FTIR）, inductively coupled plasma optical emission spectrome- ter（ICP-OES）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, thermogravimetric analyzer（TGA） and contact angle measurments, and the degradation of the material was evaluated by in vitro degra- dation experiments. The biological activity of PGS-Li scaffold was detected by calcein-AM staining and cytotoxicity test. The results indicate that PGS-Li scaffold has been successfully synthesized, which has similar composition and structure to PGS, but slightly larger molecular weight. In addition, the porosity and pore size of PGS-Li scaffold ba- sically meet the requirements of engineering scaffold materials and the seaffold shows better performance in terms of hydrophilicity and thermal stability than PGS. In vitro degradation experimental results show that the degradation rate of PGS-Li scaffold is higher than that of PGS. What＇s more, the results of cytotoxicity test and cell staining show that there is no significant difference in the proliferation and cell morphology of cementoblasts.展开更多
文摘目的:分析并总结本新生儿重症监护室(neonatal intensive care unit,NICU)极早和超早产儿的救治现状及支气管肺发育不良(bronchopulmonary dysplasia,BPD)发病情况。方法:回顾性分析2018年1月—2020年12月南京医科大学附属儿童医院新生儿医疗中心收治的胎龄<32周且出院日龄≥28 d共547例早产儿的临床资料,按临床诊断分为BPD组(n=126)和非BPD组(n=421),综合比较两组早产儿的情况,并纵向分析、总结3年的临床资料及BPD情况。结果:BPD组胎龄为(28.57±1.49)周,胎龄<28周的超早产儿占31.7%,而非BPD组胎龄为(30.05±1.39)周,超早产儿仅占8.1%(P<0.05)。BPD组出生体重(1132.18±251.25)g,<1000 g的超低出生体重儿占28.6%,而非BPD组出生体重(1384.47±267.44)g,超低出生体重儿仅占6.4%(P<0.05)。BPD组5 min Apgar评分≤7分、产房复苏率均升高(P<0.05)。非BPD组使用肺表面活性物质(pulmonary surfactant,PS)者第1次使用剂量显著大于BPD组(P<0.05),≥2次使用率低于BPD组(P<0.01)。BPD组有创及无创通气比例、通气持续时间及肺出血发病率均显著升高(P均<0.001),住院时间及总费用均高于非BPD组(P<0.05)。纵向分析,3年BPD总发病率为23.0%,2019年最高(28.8%),2018年最低(15.3%),差异有统计学意义(P<0.05);有创机械通气比例、超早产儿及超低出生体重儿比例均无显著差异(P>0.05),但2018年超低出生体重儿的平均体重显著高于其他年份(P<0.05)。结论:应加强对超早产儿及超低出生体重儿早期病情的监测及跟踪,重视PS的早期规范化应用,以进一步减少BPD,改善临床预后。
文摘Acoustically absorptive treatment in aircraft engine nacelle is an essential part of the overall aircraft noise reduction effort. The investigation on the optimization of multi-liners plays an important role in noise reduction. Based upon the mode analysis method of sound propagation in a circular duct with multiple liners, a flexible tolerance method is used to optimize the acoustic parameters(impedance), geometric structure parameters(such as open area ratio, cavity depth and hole diameter) and operating condition parameters(such as blade passing frequency). The mathematical models for these kinds of optimization are presented here. The optimum values of the design variables are determined when the in-duct sound suppression approaches a maximum. It can be derived from the optimum results that the emphasis of the engineering optimization design of the perforated plate honey-comb structure should be placed on the optimum choice of the open area ratio and cavity depth. Some reference criteria for the engineering design of the multi-linings are also provided.
文摘本文报告了1例HADHB基因复合杂合变异导致的致死型线粒体三功能蛋白缺乏症(mitochondrial trifunctional protein deficiency,MTPD)。患儿生后24 h内起病,以“吃奶少伴心肌酶异常”为主诉在生后第4天转至南京医科大学附属儿童医院。入院时体格检查见精神稍萎靡,反应尚可,心肺腹无明显异常;实验室检查肌酸激酶同工酶及肌钙蛋白均偏高,心电图提示窦性心动过速、肢导联低电压;血液代谢筛查提示十四烯酰基肉碱及多种3-羟基肉碱均偏高;全外显子组测序结果示胎儿HADHB基因复合杂合变异[c.739C>T(p.Arg247Cys)和c.607C>T(p.Arg203Ter,272)]。随访至3月龄,患儿受凉后出现吃奶差、精神差,再入院后出现心力衰竭、呼吸衰竭等多脏器功能障碍表现,经治疗无效后死亡。致死型MTPD较为罕见,目前无有效治疗措施,预后差。对于新生儿期出现不明原因心肌病、低血糖、酸中毒等代谢异常表现,应警惕致死型MTPD可能,新生儿期基因检测可早期明确诊断。
文摘Lithium ion-doped polyglycerol sebacate scaftbld（PGS）-Li was synthesized by adding lithium ions to po- lyglycerol sebacate（PGS） during its crosslinking process due to the specific effects of lithium ions on periodontal li- gament cells, cementoblasts and the eminent performance of PGS. The molecular mass, composition, structure, porosity, thermal properties, and hydrophilicity of the composite were characterized by gel permeation chromatogra- phy（GPC）, Fourier transform infrared spectroscopy（FTIR）, inductively coupled plasma optical emission spectrome- ter（ICP-OES）, scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, thermogravimetric analyzer（TGA） and contact angle measurments, and the degradation of the material was evaluated by in vitro degra- dation experiments. The biological activity of PGS-Li scaffold was detected by calcein-AM staining and cytotoxicity test. The results indicate that PGS-Li scaffold has been successfully synthesized, which has similar composition and structure to PGS, but slightly larger molecular weight. In addition, the porosity and pore size of PGS-Li scaffold ba- sically meet the requirements of engineering scaffold materials and the seaffold shows better performance in terms of hydrophilicity and thermal stability than PGS. In vitro degradation experimental results show that the degradation rate of PGS-Li scaffold is higher than that of PGS. What＇s more, the results of cytotoxicity test and cell staining show that there is no significant difference in the proliferation and cell morphology of cementoblasts.
