肝移植不同术式对血流动力学的影响

目的比较肝移植不同手术方式对血流动力学的影响。方法择期原位肝移植病人86例,根据手术方式分为三组。A组接受经典标准式肝移植(38例),B组接受经典改良式肝移植(12例),C组接受背驮式肝移植(36例)。左桡动脉和右股静脉置管连续监测平均动脉压(MAP)和下腔静脉压(ICVP);经右颈内静脉放置肺动脉漂浮导管,连续监测中心静脉压(CVP)、平均肺动脉压(MPAP)、心脏指数(C I)、外周血管阻力(SVR)和肺血管阻力(PVR)。结果无肝前期三组间血流动力学变化无差异。无肝期心率、SVR和PVR上升,C I下降,MAP维持稳定,三组间变化无明显差异。A、B组CVP下降和ICVP升高均显著大于C组(P<0.01)。新肝期开始,A、B和C三组再灌注综合征发生率分别为34.2%、16.7%和25.0%;A组MAP和C I低于B组和C组,而CVP高于B组和C组(P<0.05)。至新肝期5 m in,除A组C I仍低于B和C组(P<0.05),其他指标三组间无差异。结论对血流动力学影响,经典标准式肝移植最大,经典改良式肝移植最小。     

肝移植不同术式对血流动力学的影响

目的比较肝移植不同手术方式对血流动力学的影响.方法择期原位肝移植病人86例,根据手术方式分为三组.A组接受经典标准式肝移植(38例),B组接受经典改良式肝移植(12例),C组接受背驮式肝移植(36例).左桡动脉和右股静脉置管连续监测平均动脉压(MAP)和下腔静脉压(ICVP);经右颈内静脉放置肺动脉漂浮导管,连续监测中心静脉压(CVP)、平均肺动脉压(MPAP)、心脏指数(CI)、外周血管阻力(SVR)和肺血管阻力(PVR).结果无肝前期三组间血流动力学变化无差异.无肝期心率、SVR和PVR上升,CI下降,MAP维持稳定,三组间变化无明显差异.A、B组CVP下降和ICVP升高均显著大于C组(P<0.01).新肝期开始,A、B和C三组再灌注综合征发生率分别为34.2%、16.7%和25.0%;A组MAP和CI低于B组和C组,而CVP高于B组和C组(P<0.05).至新肝期5 min,除A组CI仍低于B和C组(P<0.05),其他指标三组间无差异.结论对血流动力学影响,经典标准式肝移植最大,经典改良式肝移植最小.     

丹参浸膏真空带式干燥工艺的研究

目的研究并确定丹参浸膏真空带式干燥的最佳工艺条件。方法采用正交试验法和多指标综合评分法,以丹参浸膏干燥产品含水率和丹参浸膏干燥速率为考察指标,对影响丹参浸膏真空带式干燥过程的因素进行考察。结果丹参浸膏真空带式干燥的最佳工艺条件为丹参浸膏含水率40%,丹参浸膏进料速率1.5 mL/s,输送带速率5 cm/m in。结论采用真空带式干燥工艺生产丹参浸膏干燥颗粒,干燥产品含水率低,干燥速率快。     

促红细胞生成素对脑缺氧的保护作用

 目的在细胞水平探讨促红细胞生成素(EPO)对缺氧诱发的神经元损伤的改善作用及缺糖缺氧诱发的脑片损伤的改善作用。方法　采用原代新生大鼠皮层培养和小鼠脑片的方法,分别以形态学和二苯基四氮唑溴盐(MTT)及2,3,5-三苯基氯化四氮唑(TTC)染色为指标观察神经元及脑片的损伤和药物的改善作用。结果EPO在10^-11,10^-12mol·L^-1能显著改善缺氧24 h引起的培养神经元死亡,其在10^-9mol·L^-1能改善缺氧45min或缺糖缺氧15min引起的脑片梗死。结论EPO对缺氧诱发的神经元死亡和缺糖缺氧诱发的脑片梗死具有保护作用。     

红参醇提液浓缩过程近红外光谱在线分析方法

 目的 应用近红外光谱在线分析中药浓缩除醇过程,实时反映过程的状态。方法 以红参醇提液的浓缩过程为例,配 制浓缩液标准样品,获得其乙醇浓度和总皂苷浓度的参考值和近红外光谱,用标准正态变量方法(standard normal variate,SNV) 和一阶导数预处理光谱,建立近红外光谱与浓度参考值之间的校正模型,并将模型用于在线分析红参醇提液浓缩除醇过程。 结果 测量总皂苷和乙醇浓度的校正模型所用波数范围分别为5543～9033cm^-1和6016～8658 cm^-1,模型测量校正集样本 总皂苷浓度的预测误差均方差(RMSEP)和相关系数r²分别是1．81 g·L^-1,0．983 9,测量乙醇浓度的RMSEP和r₂分别为 1．58％,0．997 7。结论 近红外光谱技术可作为一种中药浓缩过程的在线分析方法。     

Reliability and spatial specificity of rat brain sensorimotor functional connectivity networks are superior under sedation compared with general anesthesia

Functional connectivity networks derived from resting‐state functional MRI (rsfMRI) have received increasing interest to further our understanding of brain function. The anesthesia in rodent models may influence the interpretation and comparison of results from functional connectivity MRI (fcMRI). More research is required on this aspect. In this study, we investigated rat brain connectivity networks under 1.5% isoflurane anesthesia in comparison with medetomidine sedation. rsfMRI data were acquired under both anesthesia conditions within one imaging session. Male Wistar rats (n = 17) were scanned at 11.7 T with focus on the sensorimotor system. The data underwent a per‐subject independent component analysis (ICA), after which individual components were grouped using hierarchical clustering. Consistent and reliable networks were identified under medetomidine in sensorimotor cortex (three networks) and striatum (two networks). The incidence of these networks was drastically reduced under isoflurane. Seed correlation analysis confirmed these results and revealed globally elevated correlations with low topical specificity under isoflurane, stemming from low‐frequency global signal fluctuations. Global signal removal thus enhanced slightly regional specificity under isoflurane and showed anti‐correlations of cortico‐striatal connections in both anesthesia regimes. Functional connectivity networks are thus reliably detected in medetomidine‐sedated animals on an individual basis using ICA. Their occurrence, however, is heavily compromised under isoflurane as a result of global signal fluctuations potentially stemming from burst‐suppression‐like neural activity. Anesthesia and pharmacologically induced modulations may provide insight into network mechanisms in the future. As an agent for fcMRI in brain disease studies, light sedation using medetomidine preserves connectivity networks in a greater level of detail, and may therefore be considered superior to standard isoflurane anesthesia. Copyright © 2013 John Wiley & Sons, Ltd.     

成人Willis环50例的3.0T高场磁共振3D-TOF-MRA解剖学分析

目的 探讨Willis环各组成血管的形态和其间可能存在的相关性,为该部位血管的影像学分析提供参考.方法 回顾性分析50例来包头市中心医院接受检查者3.0 T 3D-TOF核磁共振血管成像结果.于最大密度投影法三维重建结果上测量Willis环各组成血管的内径,通过统计学分析探索各组成血管的内径之间可能存在的相关性,判断成对血管是否有内径差异以及各血管内径有无性别差异.结果 50例中,存在胚胎型大脑后动脉的有10例,占20％.右侧后交通动脉内径与同侧大脑后动脉P1段内径呈负相关(r=-0.451,P=0.001).Willis环成对动脉内径无左右差异.左颈内动脉水平岩段,男性组内径大于女性组内径(t =2.243,P=0.030).结论 导致Willis环代偿能力降低的解剖变异并非少见.Willis 环各局部血管结构之间关系复杂,个体差异较大.临床实践中应重视Willis环的解剖变异以避免诊治延误.     

Tango7 directs cellular remodeling by the Drosophila apoptosome

It is now well appreciated that the apoptosome, which governs caspase-dependent cell death, also drives nonapoptotic caspase activation to remodel cells. However, the determinants that specify whether the apoptosome acts to kill or remodel have yet to be identified. Here we report that Tango7 collaborates with the Drosophila apoptosome to drive a caspase-dependent remodeling process needed to resolve individual sperm from a syncytium. In these cells, Tango7 is required for caspase activity and localizes to the active apoptosome compartment via its C terminus. Furthermore, Tango7 directly stimulates the activity of this complex in vitro. We propose that Tango7 specifies the Drosophila apoptosome as an effector of cellular remodeling.