RF系统内固定治疗胸腰椎爆裂性骨折

目的 :总结应用RF系统内固定手术治疗胸腰椎爆裂性骨折的方法和治疗效果。方法 :脊柱后侧入路椎管探查减压或单纯使用RF系统内固定手术治疗胸腰椎爆裂性骨折 68例。结果 :经 6～ 3 6个月随访 ,椎体平均高度由术前的前 3 6 5 %和后 78 5 %恢复到术后的前 92 0 %和后 96 5 %,Cobb’s角由术前平均 15 6°恢复为术后平均 1 5°。对脊髓损伤的病人Frankel分级平均提高 1 5级。有 2例出现椎弓根钉松动 ,无断裂。结论 :RF系统结构简单 ,操作方便 ,固定确实 ,在脊柱内固定器械中具有较明显的优越性 ,有待进一步临床应用研究。     

Embolization for Bleeding after Hepatic Radiofrequency Ablation

Purpose

To evaluate safety and clinical efficacy of embolization for management of bleeding after hepatic radiofrequency (RF) ablation.

Electromagnetic fields and the blood-brain barrier

The mammalian blood-brain barrier (BBB) consists of endothelial cells, linked by tight junctions, and the adjoining pericytes and extracellular matrix. It helps maintain a highly stable extracellular environment necessary for accurate synaptic transmission and protects nervous tissue from injury. An increase in its normally low permeability for hydrophilic and charged molecules could potentially be detrimental. Methods to assess the permeability of the BBB include histological staining for marker molecules in brain sections and measurement of the concentration of marker molecules in blood and brain tissue. Their advantages and disadvantages are discussed. Exposure to levels of radiofrequency electromagnetic fields (EMF) that increase brain temperature by more than 1 °C can reversibly increase the permeability of the BBB for macromolecules. The balance of experimental evidence does not support an effect of ‘non-thermal’ radiofrequency fields with microwave and mobile phone frequencies on BBB permeability. Evidence for an effect of the EMF generated by magnetic resonance imaging on permeability is conflicting and conclusions are hampered by potential confounders and simultaneous exposure to different types and frequencies of EMF. The literature on effects of low frequency EMF, which do not cause tissue heating, is sparse and does not yet permit any conclusions on permeability changes. Studies on the potential effect of EMF exposure on permeability of the BBB in humans are virtually absent. Future permeability studies should focus on low frequency effects and effects in humans. Care should be taken to avoid the methodological limitations of earlier studies and to determine the pathophysiological relevance of any changes found.     

类风湿因子检测的临床应用

类风湿关节炎是一种常见病,同时也是一种常见的多发病,病人随着病情的进展可致关节畸形,重者甚至导致致残.探讨类风湿因子(RF)分型定量检测对类风湿关节炎(RA)诊断、治疗以及预后的意义.文中分别采用了散射比浊法与ELISA方法来定量检测RA患者组以及其他风湿病组血清中IgG、RF、IgM、RF、IgA、RF的含量.     

Novel 16‐channel receive coil array for accelerated upper airway MRI at 3 Tesla

Upper airway MRI can provide a noninvasive assessment of speech and swallowing disorders and sleep apnea. Recent work has demonstrated the value of high‐resolution three‐dimensional imaging and dynamic two‐dimensional imaging and the importance of further improvements in spatio‐temporal resolution. The purpose of the study was to describe a novel 16‐channel 3 Tesla receive coil that is highly sensitive to the human upper airway and investigate the performance of accelerated upper airway MRI with the coil. In three‐dimensional imaging of the upper airway during static posture, 6‐fold acceleration is demonstrated using parallel imaging, potentially leading to capturing a whole three‐dimensional vocal tract with 1.25 mm isotropic resolution within 9 sec of sustained sound production. Midsagittal spiral parallel imaging of vocal tract dynamics during natural speech production is demonstrated with 2 × 2 mm² in‐plane spatial and 84 ms temporal resolution. Magn Reson Med, 2011. © 2010 Wiley‐Liss, Inc.     

高频透热联合肝动脉化疗栓塞治疗晚期原发性肝癌的临床研究

目的观察高频透热联合肝动脉化疗栓塞治疗晚期原发性肝癌的疗效及不良反应。方法随机将69例晚期原发性肝癌患者分为两组：对照组35例，单纯行动脉化疗栓塞治疗，从导管注入顺铂80mg，氟尿嘧啶1000mg，表阿霉素60mg，其中将表阿霉素与碘化油10柚混合乳化后行栓塞。治疗组34例，行动脉化疗栓塞治疗后再行局部高频透热治疗。结果治疗组近期疗效总有效率为70．59％，对照组为45．71％。两组比较差异有统计学意义。治疗组0．5、1．0、1．5、2．0年生存率分别为82．35％、73．53％、58.82％、38．24％，对照组分别为74．29％、75．14％、45．71％、22．86％。治疗组有增高的趋势。两组不良反应相近。结论高频透热联合肝动脉化疗栓塞治疗晚期原发性肝癌优于单纯肝动脉化疗栓塞，且不增加不良反应，是一种安全、有效的综合治疗方法。