青年脑梗死患者血浆白蛋白及纤维蛋白原水平与其神经功能缺损严重程度的关系

目的探讨青年脑梗死(CI)患者血浆白蛋白(ALB)及纤维蛋白原(FIB)水平与其神经功能缺损严重程度的关系。方法选取2012年6月至2013年6月我院神经内科住院CI青年患者98例(观察组)和同期年龄低于45岁的非CI健康体检者30例(对照组)。统计分析两组ALB、FIB水平和神经功能缺损评分(NHISS),采用Pearson相关性分析法分析青年CI患者ALB及FIB水平与其神经功能缺损严重程度的关系,采用ROC曲线分析青年CI患者ALB和FIB水平对其神经功能缺损严重程度的预测作用。结果观察组治疗前的ALB、FI B水平及NHISS得分均高于对照组,治疗3天、1周、1个月、3个月和6个月的ALB、FI B水平和NHISS得分与治疗前比较,差异均有统计学意义(P<0.05)。Pearson相关分析结果显示,ALB及FIB水平均与其神经功能缺损严重程度呈显著正相关(r=0.802和0.814,P<0.01);ALB和FIB水平预测其神经功能缺损严重程度的ROC曲线下面积分别为0.765和0.748。结论青年脑梗死患者ALB和FIB水平均较正常人升高,且ALB和FIB水平均与其NHISS显著相关,青年脑梗死患者ALB和FIB水平的提高可在一定程度上预测其神经功能缺损的加重。     

呼吸机撤机困难原因及撤机预测参数的研究进展

呼吸机撤机是机械通气后所面临的一个重要难题。影响撤机的因素是多方面的,涉及多系统功能,主要是呼吸力量与负荷之间的关系以及心肺功能相互影响的结果。结合困难撤机原因,寻找合适预测撤机的参数,可提高撤机成功率,最大限度改善临床预后。     

Functional recovery of denervated muscle by neurotization using nerve guidance channels

Tissue‐engineered muscle has been proposed as a means of repairing volumetric muscle defects to restore anatomical and functional recovery. We have previously demonstrated that denervated muscle, which is analogous to engineered muscle construct, can be reinnervated by direct transplantation of host nerve (neurotization) in a rat model. However, the use of this approach is not possible if the length of host nerve is inadequate and cannot be mobilized to the insertion site of the engineered muscle. In this study we investigated whether neurotization coupled with nerve guidance channels would increase the regeneration of neuromuscular junctions (NMJs) in completely denervated muscle and encourage neurofunctional recovery. Seventy‐two Lewis rats were evaluated in three groups, a normal control group (n = 8), a denervated group (n = 32) and a neurotization coupled with nerve guidance group (n = 32). Neurofunctional behaviour and histological evaluations were performed at 4, 8, 12 and 20 weeks postoperatively. Extensor postural thrust (EPT) and compound muscle action potential (CMAP) amplitude were significantly improved in the nerve guidance group when compared with the denervated group, even though these values were different from those of the normal control group at 20 weeks postoperation. Regeneration of axons and NMJs was demonstrated histologically in the nerve guidance group. Neurotization coupled with nerve guidance channels leads to regeneration of axons and NMJs in completely denervated muscle. To our knowledge, this is the first report to show that nerve guidance can allow re‐innervation in denervated muscle containing long‐gap nerve injuries. Copyright © 2013 John Wiley & Sons, Ltd.     

The potential of DBP gels containing intervertebral disc cells for annulus fibrosus supplementation:in vivo

Demineralized bone particle (DBP), which is widely used as a biomaterial in the field of tissue engineering, contains various bioactive molecules, such as cytokines. For this reason, in this study we investigated the effects of injectable DBP gels on cell proliferation, inflammation and maintenance of the shape of DBP gels as a scaffold able to substitute for intervertebral discs (IVDs) in vivo. DBP gels were fabricated with different percentages (5% and 10%) of DBP powder and 3% acetic acid, including 0.02% pepsin. DBP gels with 1 × 10⁶ annulus fibrosus (AF) cells were implanted into the dorsal subcutaneous region of BALB/C‐nu mice for 1, 2 and 3 weeks. Cell proliferation was measured by MTT assay. The effect of DBP gels on the inflammatory response was analysed by measuring the amount of tumour necrosis factor‐alpha (TNFα) released. Also, histological methods were carried out to analyse the response of DBP gels in vivo. This study demonstrated that injectable DBP gels are able to provide physical scaffolds for growing IVD cells in vivo. Copyright © 2013 John Wiley & Sons, Ltd.