目的探讨高危妊娠宫内缺氧胎儿血流动力学指标变化及其对围生儿结局等影响。方法选取2017年12月-2019年10月收治的高危妊娠130例,根据是否存在胎儿宫内缺氧将其分为缺氧组(45例)和无缺氧组(85例)两组。比较两组胎儿彩色多普勒超声检查...目的探讨高危妊娠宫内缺氧胎儿血流动力学指标变化及其对围生儿结局等影响。方法选取2017年12月-2019年10月收治的高危妊娠130例,根据是否存在胎儿宫内缺氧将其分为缺氧组(45例)和无缺氧组(85例)两组。比较两组胎儿彩色多普勒超声检查结果和围生儿结局,新生儿出生后7和28 d新生儿神经行为测定(NBNA)评分,以及新生儿出生后6和12个月智力发育指数(MDI)和运动发育指数(PDI)。结果缺氧组大脑中动脉(MCA)收缩期最大血流速度与舒张末期血流速度比值(S/D)、搏动指数(PI)、阻力指数(RI)和脑-胎盘率(CPR)均低于无缺氧组,而脐动脉(UA)S/D、PI和RI均高于无缺氧组,新生儿出生孕周、出生体质量和出生后1 min Apgar评分短于或低于无缺氧组,剖宫产率和胎儿宫内生长受限、新生儿窒息发生率均高于无缺氧组,新生儿出生后7和28 d NBNA评分及新生儿出生后6和12个月MDI和PDI均低于无缺氧组,差异有统计学意义(P<0.05或P<0.01)。结论高危妊娠宫内缺氧可导致胎儿血流动力学指标改变,彩色多普勒超声检测高危妊娠胎儿MCA和UA血流动力学指标有助于及时发现胎儿宫内缺氧,提高生育质量。展开更多
A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of...A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of vibration amplitude, throwing index, and screen deck inclination angle on the screening process are discussed. The results show that the average velocity of the particles increases along the lon- gitudinal direction of the deck. The screening efficiency is highest when the vibration amplitude, throw- ing index, and screen deck inclination angle are 3-3.5 mm, 2.7 and 15°, respectively. This work is helpful for developing a deep understanding of particle motion and for optimizing screen separator designs.展开更多
文摘目的探讨高危妊娠宫内缺氧胎儿血流动力学指标变化及其对围生儿结局等影响。方法选取2017年12月-2019年10月收治的高危妊娠130例,根据是否存在胎儿宫内缺氧将其分为缺氧组(45例)和无缺氧组(85例)两组。比较两组胎儿彩色多普勒超声检查结果和围生儿结局,新生儿出生后7和28 d新生儿神经行为测定(NBNA)评分,以及新生儿出生后6和12个月智力发育指数(MDI)和运动发育指数(PDI)。结果缺氧组大脑中动脉(MCA)收缩期最大血流速度与舒张末期血流速度比值(S/D)、搏动指数(PI)、阻力指数(RI)和脑-胎盘率(CPR)均低于无缺氧组,而脐动脉(UA)S/D、PI和RI均高于无缺氧组,新生儿出生孕周、出生体质量和出生后1 min Apgar评分短于或低于无缺氧组,剖宫产率和胎儿宫内生长受限、新生儿窒息发生率均高于无缺氧组,新生儿出生后7和28 d NBNA评分及新生儿出生后6和12个月MDI和PDI均低于无缺氧组,差异有统计学意义(P<0.05或P<0.01)。结论高危妊娠宫内缺氧可导致胎儿血流动力学指标改变,彩色多普勒超声检测高危妊娠胎儿MCA和UA血流动力学指标有助于及时发现胎儿宫内缺氧,提高生育质量。
基金support from the Innovative Research Groups of the National Natural Science Foundation of China (No. 50921002)the Natural Science Foundation of Jiangsu Province of China (No. BK2010002)+1 种基金the Fundamental Research Funds for the Central Universities (Nos. 2011QNA10,2010QNB17)the China Postdoctoral Science Foundation (No.20110491485)
文摘A numerical study of the motion particulates follow along a circularly vibrating screen deck was done using the three dimensional Discrete Element Method (DEM). The motion of the particles was analyzed. The effects of vibration amplitude, throwing index, and screen deck inclination angle on the screening process are discussed. The results show that the average velocity of the particles increases along the lon- gitudinal direction of the deck. The screening efficiency is highest when the vibration amplitude, throw- ing index, and screen deck inclination angle are 3-3.5 mm, 2.7 and 15°, respectively. This work is helpful for developing a deep understanding of particle motion and for optimizing screen separator designs.
