Assessment of left ventricular mechanical dyssynchrony by phase analysis of ECG-gated SPECT myocardial perfusion imaging

Cardiac resynchronization therapy (CRT) has shown benefits in patients with severe heart failure. However, at least 30% of patients selected for CRT by use of traditional criteria (New York Heart Association class III or IV, depressed left ventricular [LV] ejection fraction, and prolonged QRS duration) do not respond to CRT. Recent studies with tissue Doppler imaging have shown that the presence of LV dyssynchrony is an important predictor of response to CRT. Phase analysis has been developed to allow assessment of LV dyssynchrony by gated single photon emission computed tomography myocardial perfusion imaging. This technique uses Fourier harmonic functions to approximate regional wall thickness changes over the cardiac cycle and to calculate the regional onset-of-mechanical contraction phase. Once the onset-of-mechanical contraction phases are obtained 3-dimensionally over the left ventricle, a phase distribution map is formed that represents the degree of LV dyssynchrony. This technique has been compared with other methods of measuring LV dyssynchrony and shown promising results in clinical evaluations. In this review the phase analysis methodology is described, and its up-to-date validations are summarized.     

人参二醇组皂甙对肾小管细胞增殖的影响

目的　探讨人参二醇组皂甙 (Panaxadiolsaponins ,PDS)对肾小管细胞增殖的影响。方法　应用噻唑蓝 (thia zollblue ,MTT)染色法观察PDS对正常的和庆大霉素 (Gentamicin ,GM)损伤的肾小管细胞增殖的影响。结果和结论　在一定浓度范围内 (5～ 2 5 μg/ml)PDS促进正常肾小管细胞增殖 ,10 μg/mlPDS作用最明显。PDS浓度过高 (>75μg/ml)则抑制其生长 (P <0 .0 5 )。适量PDS可促进庆大霉素损伤肾小管细胞的增殖     

肺岩宁方对ILK基因沉默后转染人肺癌A549细胞相关基因表达的影响

目的:探讨整合素连接激酶(ILK)基因沉默后及中药肺岩宁方对相关下游靶基因表达的影响。方法:构建载体转染人肺腺癌细胞A549后,随机分为阴性对照病毒感染细胞(NC)组、RNAi靶点病毒感染细胞(KD)组、10%肺岩宁含药血清干预的NC组与KD组、20%肺岩宁含药血清干预的NC组与KD组,以及阳性对照10%DDP干预的KD组,应用Real time-PCR及Western Blot方法检测下游靶基因蛋白激酶B(Akt/PKB)、糖原合成酶激酶-3β(GSK-3β)、转录因子-1(AP-1)、细胞周期蛋白D1(cyclinD1)、基质金属蛋白酶-9(MMP-9)、血管内皮生长因子(VEGF)、β-链蛋白(β-catenin)的mRNA及蛋白表达水平。结果:与NC组比较,KD组GSK-3β、VEGF mRNA和蛋白表达显著下调(P0.05,P0.01),cyclinD1、MMP-9 mRNA和蛋白表达显著上调(P0.05,P0.01),Akt表达无变化,AP-1与β-catenin在mRNA水平表达升高(P0.01)、蛋白水平表达则下降;与KD组比较,KD+10%肺岩宁含药血清和KD+10%DDP组具有下调VEGF、cyclinD1、MMP-9和β-catenin蛋白表达、上调GSK-3β蛋白表达,以及下调AP-1、cyclinD1 mRNA表达的作用(P0.01);与KD组相比,KD+20%肺岩宁含药血清具有下调AP-1、cyclinD1和MMP-9蛋白表达的作用。结论:沉默ILK基因后可以明显降低GSK-3β、VEGF的表达,10%的中药肺岩宁方含药血清可能通过下调靶基因AP-1、cyclinD1、MMP-9、VEGF和β-catenin蛋白表达的作用而发挥其抗肿瘤的作用。     

挽救ICSI的临床应用价值探讨

目的探讨挽救ICSI（R-ICSI）在临床应用的价值及可行性。方法常规IVF周期中,授精4-6 h后观察第2极体,对6 h后明确未排出第2极体的成熟卵母细胞达50%以上者实行R-ICSI,其实施33周期,并与同期113个常规ICSI周期进行比较。结果与常规ICSI比较,R-ICSI的受精率、3原核（3PN）发生率、优质胚胎率、妊娠率、种植率方面差异无统计学意义,1原核（1PN）发生率明显增高（P〈0.01）。结论R-ICSI可以获得较好的临床效果。     

正确认识退变性脊柱矢状位平衡与失衡

随着全球人口老龄化的加速,退变性脊柱疾病的发生率和致残率不断升高,已成为老年社会面临的健康、卫生、经济及社会问题.同时,由于医学认知的提高和医疗技术的进步,越来越多老年退变性脊柱矢状问题得到诊断和治疗.然而,在获得部分临床效果的同时,由于对退变性脊柱矢状位平衡与失衡的科学认识尚不完全清晰,在此基础上实施的手术治疗尚有部分效果不佳,并发症较多,翻修手术率高,存在过多医疗依赖,经济负担重.目前,国际上越来越多的学者强调:务必正确认识老年退变性脊柱矢状位平衡与失衡,严格把握手术指征,慎重选择手术,努力降低各种并发症,提高卫生经济品质,使临床效果和社会效益最大化,最终让患者和社会获益.     

抑制PI3K通路增强CAHB对Jurkat细胞的凋亡作用

目的 探讨CAHB单独使用及与LY294002联合应用对Jurkat细胞体外作用的影响.方法 分别用不同剂量的CAHB(0、5、10、20、40mmol/L)诱导Jurkat细胞,用MTS法检测Jurkat细胞的增殖抑制效应,流式细胞术分析Jurkat细胞凋亡情况;取40mmol/L浓度的CAHB加入PI₃K抑制剂LY294002,流式细胞术分析Jurkat细胞凋亡情况.结果 CAHB对Jurkat细胞生长有显著的抑制作用,并能显著诱导Jurkat细胞发生凋亡,其作用呈明显剂量、时间依赖性.PI₃K抑制剂LY294002能显著增强CAHB对Jurkat细胞的凋亡作用.结论 CAHB能抑制Jurkat细胞增殖,并诱导其凋亡.抑制PI₃K通路能增强CAHB对Jurkat细胞的凋亡作用.     

Characterization of protein rheology and delivery forces for combination products

Characterization of a protein–device combination product over a wide range of operating parameters defined by end-user requirements is critical for developing a product presentation that is convenient for patient use. In addition to the device components, several product attributes, such as product rheology and product–container interactions, govern the functionality of a delivery system. This article presents results from a characterization study conducted for a high-concentration antibody product in a prefilled syringe. Analytical models are used to study the rheological behavior and to estimate delivery forces over a broad design space comprising temperature, concentration, and shear stress. Data suggest that high-viscosity products may exhibit significant shear thinning under the shear rates encountered under desired injection times.