卡托普利对左向右分流先天性心脏病肺动脉高压患者的血液动力学影响观察

目的观察卡托普利对左向右分流先天性心脏病肺动脉高压患者的血液动力学影响。方法随机选取2018年5月～2019年5月我院左向右分流先天性心脏病患者30例,给予所有患者卡托普利治疗,治疗前、治疗后3～5 d分别采用彩色多普勒超声诊断仪(麦瑞Resona 75型)对患者的血液动力学指标进行检测,然后统计分析30例患者治疗前后的血液动力学。结果 30例患者治疗后的PAMP、AMP、TSR均显著低于治疗前(P0.05)。30例患者中治疗后19例TPR/TSR上升,11例TPR/TSR下降。TPR/TSR上升患者治疗后的AMP、TSR、Qp/Qs均显著低于治疗前(P0.05),TPR/TSR、Qs均显著高于治疗前(P0.05);TPR/TSR下降患者治疗后的PAMP、AMP、PAMP/AMP、TPR、TPR/TSR均显著低于治疗前(P0.05),Qp/Qs显著高于治疗前(P0.05)。治疗前TPR/TSR上升患者的TPR/TSR显著低于TPR/TSR下降患者(P0.05),但二者的PAMP、AMP、PAMP/AMP、TPR、TSR、Qp、Qs、Qp/Qs之间的差异均不显著(P0.05)。结论卡托普利能够有效降低左向右分流先天性心脏病患者的肺动脉高压,但会提升患者的Qp/Qs。     

Capillary leak syndrome: A rare cause of acute respiratory distress syndrome

Capillary leak syndrome (CLS) is a rare clinical syndrome associated with significant morbidity and mortality. Intensive care and supportive therapy constitute the mainstay of the treatment, along with judicious use of crystalloids and colloids such as dextran and starch during the leak phase. The advantages of proning, steroids, and intravenous immunoglobins are worth contemplating in patients with such a presentation. Extracorporeal membrane oxygenation appears to be an excellent strategy to surmount the impediments of the leak and post leak phase of CLS, especially in patients with severe or refractory hypoxemia.     

腰椎旁神经阻滞联合全凭静脉全身麻醉对髋关节置换术患者血流动力学、应激反应、术后苏醒的影响

目的观察腰椎旁神经阻滞联合全凭静脉全身麻醉对髋关节置换术患者血流动力学、应激反应、术后苏醒的影响。方法选取2018年1月—2019年8月我院收治的行髋关节置换术患者115例,根据手术麻醉方法的不同分为观察组60例和对照组55例,观察组予腰椎旁神经阻滞联合全凭静脉全身麻醉,对照组仅予全凭静脉全身麻醉。比较两组麻醉前(T0)、麻醉后10 min(T1)、麻醉后30 min(T2)、术毕(T3)时平均动脉压、心率、去甲肾上腺素及肾上腺素水平变化,术后清醒镇静效果和苏醒时间,以及两组手术期间不良反应发生情况。结果观察组T1、T2、T3时平均动脉压、心率与T0时比较虽略有升高,但差异无统计学意义(P>0.05);对照组T1、T2、T3时平均动脉压、心率与T0时比较均升高,且以T2时平均动脉压、心率最高,T3时又回落至T1时水平,差异有统计学意义(P<0.05)。T1、T2、T3时观察组平均动脉压、心率均低于对照组(P<0.05)。T1、T2、T3时两组去甲肾上腺素、肾上腺素均较T0时升高,且观察组相同时间点去甲肾上腺素、肾上腺素水平低于对照组,差异均有统计学意义(P<0.05或P<0.01)。观察组术后唤醒时警觉/镇静评分低于对照组,苏醒时间明显短于对照组,差异均有统计学意义(P<0.05)。两组手术期间总不良反应发生率比较差异无统计学意义(P>0.05)。结论腰椎旁神经阻滞联合全凭静脉全身麻醉用于髋关节置换术可有效防止患者血流动力学指标的波动,减轻手术应激反应程度,术后苏醒快,术后苏醒质量佳,且未增加手术期间不良反应的发生。     

Nonlinear elasticity of biological basement membrane revealed by rapid inflation and deflation

Basement membrane (BM) is a thin layer of extracellular matrix that surrounds most animal tissues, serving as a physical barrier while allowing nutrient exchange. Although they have important roles in tissue structural integrity, physical properties of BMs remain largely uncharacterized, which limits our understanding of their mechanical functions. Here, we perform pressure-controlled inflation and deflation to directly measure the nonlinear mechanics of BMs in situ. We show that the BMs behave as a permeable, hyperelastic material whose mechanical properties and permeability can be measured in a model-independent manner. Furthermore, we find that BMs exhibit a remarkable nonlinear stiffening behavior, in contrast to the reconstituted Matrigel. This nonlinear stiffening behavior helps the BMs to avoid the snap-through instability (or structural softening) widely observed during the inflation of most elastomeric balloons and thus maintain sufficient confining stress to the enclosed tissues during their growth.

Basement membrane (BM) is a thin layer of fibrous matrix separating cells from the connecting tissues, which functions as a physical barrier and widely exists across multicellular organisms (1). The BM is typically composed of laminins, collagen IV, nidogens, and proteoglycans; laminin and collagen IV are the major components that constitute networks forming the structure of the BM, and nidogen and proteoglycans are associated with the laminin and collagen IV networks. As a physical barrier, the structural and mechanical properties of BM are important in the organization and morphogenesis of tissues and organs as well as in the maintenance of adult functions (2); abnormal BM has been associated with a variety of diseases such as cancer (3). For example, in metastasis, cancer cells must invade through BMs to escape from the primary tumor—a process that causes 90% of cancer-related death (4). Indeed, breaks in BMs can be observed in malignant tumors (5). Thus, mechanical properties of the BM are considered to play important roles in regulating cancer cell invasion (6, 7). Furthermore, as a physical barrier differentiating different parts of tissues, BMs are required to be permeable to small molecules to allow exchange of water and nutrients; the permeability of BM is thus one of the essential kinetic parameters regulating biomolecule exchange and activities of internal cells (8, 9). Given the importance of BMs as a semipermeable barrier maintaining tissue structural integrity, however, their permeability and mechanical properties remain largely unknown, mainly due to the lack of direct measurement methods, especially in situ. This limits our understanding of the physical role of BMs in various physiological and pathological processes such as tumor development and angiogenesis.Determining the mechanical properties of intact BMs in situ is challenging because of their irregular shape, small thickness, and tight connection to the cells inside. Due to these limitations, conventional mechanical tests such as tensile, compression, and bending tests are difficult to be applied to characterize the mechanical behavior of the BM in situ. Instead, previous measurements had been carried out on fragmented BMs isolated from various tissues (e.g., via atomic force microscopy [AFM] indentation) and found that the BM stiffness ranges from ∼kPa to ∼MPa (10–17). In addition, a constitutive relationship is required to extract the material parameters such as elastic modulus and permeability from these experimental measurements. However, like most biological tissues, a reliable constitutive model for the BM is not yet available, causing additional difficulties in obtaining its mechanical parameters from most traditional experiments.In this work, we demonstrate an in situ method to simultaneously measure both the elastic properties and permeability of intact BM in breast cancer spheroid by recording the deflation process of an inflated BM filled with phosphate buffered saline (PBS) by microinjection without requiring complex sample preparation and post-data processing. During the deflation of the BM, its elastic retraction generates a pressure difference to drive the liquid flow through the membrane; the liquid flux can be calculated from the reduction of the intact BM diameter. With the BM thickness measured by transmission electron microscopy (TEM), we can determine the shear modulus, permeability, and diffusivity of the intact BM. Moreover, we find from our measurements that the elasticity of BM is highly nonlinear with a strong strain-stiffening effect. Furthermore, we discuss the possible impact of the strain-stiffening effects of BM on its functions.     

孕前超重及肥胖女性孕中期子宫-胎盘血流动力学的变化

目的探讨孕前超重及肥胖女性孕中期子宫-胎盘血流动力学及胎儿生长发育指标的变化。 方法回顾性选取2019年6月至2020年9月在唐都医院进行产前检查并行胎儿超声心动图检查的孕妇127例。依据孕前体质量指数（BMI）将孕妇分为正常对照组55例、超重组45例和肥胖组27例。对3组孕妇的一般资料、子宫-胎盘血流、胎儿生物学测量指标和大脑中动脉、脐动脉血流进行比较分析。 结果与正常组孕妇相比，超重组及肥胖组孕妇双侧子宫动脉收缩期峰值血流速度（Vs）、舒张期峰值血流速度（Vd）及搏动指数（PI）均升高，3组比较差异均有统计学意义（P均＜0.05），其中肥胖组孕妇双侧子宫动脉PI较超重组升高（P均＜0.05）。与正常组比较，肥胖组和超重组胎儿脐动脉游离段血流速度不同程度减低，3组比较差异均有统计学意义（Vs：F值=4.41，P=0.01；Vd：F值=4.03，P=0.02）；进一步两两比较，超重组与正常组Vd比较，差异有统计学意义（P＜0.05）；肥胖组与正常组Vs比较，差异有统计学意义（P＜0.05）。 结论孕前超重及肥胖女性孕中期子宫-胎盘循环血流动力学已经出现明显改变，应用超声实时监测这些参数变化对指导临床合理控制孕期体重，避免或减少相关并发症有潜在价值。     

血必净联合去甲肾上腺素对感染性休克疗效的影响

【摘要】 目的 观察血必净联合去甲肾上腺素(NE)对感染性休克（SS）治疗的临床效果，并探讨其对患者血流动力学和血清C反应蛋白(CRP)、降钙素原(PCT)水平的影响。方法 选取我院2015年6月~2017年6月收治的114例SS患者，采取随机数字表法均分为两组，对照组予以去甲肾上腺素治疗，观察组在此基础上加用血必净治疗，记录比较两组的临床疗效，治疗前后血流动力学指标及血清CRP、PCT水平变化，以及不良反应发生情况。结果 治疗14d后，观察组总有效率为930%，较对照组的789%明显上升(P＜005)。随治疗时间的延长，两组肺动脉楔压(PAWP)、中心静脉压(CVP)、血氧饱和度(SpO2)及心脏指数(CI)值均逐渐增加(P＜005)；且观察组治疗7、14d后上述指标改善均明显优于对照组(P＜005)。两组血清CRP、PCT水平均随治疗时间的延长而逐渐下降(P＜001)；且观察组治疗7、14d后上述指标水平均较对照组更低(P＜001)。而观察组和对照组不良反应发生率相比，差异无统计学意义(105% vs 140%，P＞005)。结论 血必净联合NE治疗感染性休克更能短期内消除或缓解患者的症状体征，改善微循环，提高治疗效果，且安全可靠。     

中药熏蒸联合针灸推拿治疗中风的临床效果

目的：观察中药熏蒸联合推拿和针灸治疗中风的临床疗效。方法：选取2018年11月至2020年7月南通大学第二附属医院收治的中风患者100例作为研究对象，按照入院顺序进行编号，按编号单双数不同分为对照组和观察组，每组50例。对照组给予推拿+针灸治疗，观察组则在对照组基础上给予中药熏蒸治疗。比较2组患者临床疗效、红细胞压积（HCT）、纤维蛋白原（FBG）、血浆黏度（CP）、免疫学（lgA，lgG，lgM）、神经缺损（NDF）、运动功能（FMA）、临床痉挛指数（CSI）及不良反应。结果：治疗后，观察组临床有效率为96.00%，对照组为84.00%，差异有统计学意义（P<0.05）；2组FBG、CP、HCT、IgA、IgM、IgG水平均显著降低，且观察组显著低于对照组（P<0.05）；2组NDF、CSI评分均明显降低，且观察组明显低于对照组（P<0.05）；2组FMA评分上升，且观察组显著高于对照组（P<0.05）；对照组与观察组的不良反应发生率分别为10.00%和12.00%，差异无统计学意义（P>0.05）。结论：改良中药熏蒸法联合推拿、针灸可改善中风患者血循环状态和免疫调节，促进神经及运动功能恢复，疗效确切。     

宫腔内灌注粒细胞集落刺激因子联合低分子肝素在薄型子宫内膜患者冻融胚胎移植周期中的研究

目的:探讨宫腔内灌注粒细胞集落刺激因子(G-CSF)联合低分子肝素(LMWH)对薄型子宫内膜患者冻融胚胎移植(FET)周期中的临床疗效。方法:选取2018年6月-2019年10月于山西医科大学第一医院进行FET助孕治疗的薄型子宫内膜患者175例,根据患者自身意愿分为3组,A组:63例患者仅接受激素替代治疗;B组:52例患者接受激素替代治疗+宫腔内G-CSF灌注;C组:60例患者接受激素替代治疗+宫腔内G-CSF灌注+皮下注射LMWH。对3组患者的子宫内膜厚度、子宫内膜血流阻力指数(RI)、搏动指数(PI)、周期取消率、胚胎种植率、临床妊娠率、早期流产率、异位妊娠率等指标进行比较。结果:在内膜转化日,与A组相比,B、C组子宫内膜厚度、Ⅱ+Ⅲ型血流比例均增加,RI、PI均降低(P<0.05)。治疗结局方面,与A组相比,B、C组胚胎种植率、临床妊娠率增加,周期取消率降低,差异有统计学意义(P<0.05);B、C组间比较差异无统计学意义(P>0.05);C组早期流产率较B组降低,差异有统计学意义(P<0.05)。结论:在FET周期中宫腔内灌注G-CSF可提高薄型子宫内膜患者的子宫内膜厚度,改善子宫内膜的血流情况,提高胚胎种植率及临床妊娠率,注射LMWH可降低早期流产率。