PPARδ基因多态与有氧能力及训练敏感性的关联研究

目的探讨过氧化物酶体增殖物激活受体δ(PPARδ)基因第四外显子的单核苷酸多态(C294T)是否与有氧运动能力及训练敏感性相关联。方法对102名中国北方地区汉族男性青年进行为期18周的耐力训练(每次5000米、每周3次)。强度以个体通气无氧阈(VT)对应的心率(HRVT)为标准,前10周采用95%通气无氧阈对应的心率(HRVT±3),后8周采用105%通气无氧阈对应的心率(HRVT±3)。递增负荷运动实验测定受试者训练前后VO2max及相关指标和跑节省化时的心率(HR)、通气量(VE)和摄氧量(VO2)。采用限制性片断长度多态(PCR-RFLP)法测定PPARδ基因C294T位点。结果三种基因型的分布频率分别为CC基因型9人(0.09)、CT基因型37人(0.36)和TT基因型56人(0.55),符合Hardy-Weinberg平衡。按基因型分组后,CC基因型训练前的VO2max相对值显著性高于CT基因型和TT基因型(P<0.05);携带不同基因型群体的VO2max、跑节省化测试中的各项指标的变化率无显著性差异(P>0.05)。结论PPARδ基因第四外显子的单核苷酸C294T多态与VO2max相对值的初始值相关联,但与有氧耐力训练效果不关联。     

细胞移植治疗心肌梗死的研究与展望

细胞移植是治疗心肌梗死的一种新策略,本文对目前应用于临床研究的骨骼肌卫星细胞移植及骨髓干细胞移植治疗心肌梗死的进展进行综述。上述两种细胞移植均具有来源丰富、无排斥反应的特点,而且通过研究观察表明,上述两种细胞移植后,心脏功能均能得到改善,故具有美好发展前景。但二者亦均具有不足之处和需要解决的问题,还需进一步研究与探索。     

CT增强扫描患者心理分析与护理

本文对470例行CT增强扫描患者心理进行分析、分型，强调心理护理的重要性，针对不同心理表现在增强扫描过程中采取不同的护理措施，效果很好。     

内源性转化生长因子β1对膀胱癌细胞体外生长的影响

目的：研究内源性转化生长因子β1（TGFβ1）对膀胱癌细胞增殖的影响及机制。方法：构建携TGFβ1反义RNA的复制缺陷型逆转录病毒载体pRevTβ-AS，转染膀胱癌EJ细胞株，观察抑制内源性TGFβ1表达对EJ细胞体外增殖的影响；流式细胞仪分析转染后细胞周期时相分布的改变。结果：将TGFβ1反义RNA导入EJ细胞并有效表达；抑制TGFβ1表达可以降低靶细胞的生长速度和克隆形成率，使细胞增殖指数下降12％；反义RNA转染的EJ细胞G0和G1期细胞占65．7％，高于对照组细胞，S期细胞占20．5％，低于对照组细胞。结论：内源性TGFβ1通过诱导膀胱癌细胞G1→S期转换，促进肿瘤细胞体外增殖。     

BDNF基因修饰神经干细胞移植后大鼠脊髓损伤移植处的基因表达变化

目的：了解脑源性神经营养因子（Brain-derived neurotrophic factor,BDNF）基因修饰神经干细胞移植到大鼠脊髓损伤处后的基因表达变化，为脊髓损伤修复提供基础研究资料。方法：大鼠随机分为4组：正常对照组，手术对照组，神经干细胞（Neural stem cells,NSCs）移植组，BDNF－NSCs移植组，各组分4个时相点（7d、1个月、2个月、3个月），利用细胞移植、X-gal组化、免疫组化、原位杂交等方法，观察了移植处细胞的标记基因（LacZ）表达和BDNF、胶质纤维酸性蛋白（GFAP）、神经丝－200（NF－200）的表达。结果：大鼠脊髓损伤移植处细胞中，有标记基因阳性细胞，BDNF强烈表达，尤其是BDNF－NSCs移植组的移植后1周和1个月时。各组各时相点均有GFAP和NF－200免疫反应阳性细胞和纤维。结论：BDNF基因修饰神经干细胞能在脊髓损伤移植处存活，强烈表达BDNF，BDNF基因修饰神经干细胞可以作为脊髓损伤修复的移植材料。     

对孙真人《养生铭》的现代诠释(二)

(续)亥寝鸣云鼓,寅兴漱玉津。妖邪难犯己,精气自全身。在这一节里,孙思邈郑重提出了两条养生的具体措施“:鸣云鼓”和“潄玉津”,并且指出了它们与正常睡眠和祛邪防病、保精全神的关系。何谓“鸣云鼓”?就是叩齿。何时鸣云鼓?孙氏也明确规定了时间“,亥”时,即夜晚的21～23时。在《千金方》中,孙氏还提出过早晨叩齿的方法,曰“:每旦以一撮盐纳口中,以暖水含,揩牙及叩击百遍,为之不绝,不过五日,口齿即牢密”。可见,孙氏对叩齿与护齿的关系看得是很重的。叩齿何益?用现代的话说,它可以增强牙齿的力量和防病、抗病能力,促进牙周组织及根尖组织…     

Prognostic role of alveolar-arterial oxygen pressure difference in acute pulmonary embolism.

BACKGROUND: This study investigated the utility of the alveolar - arterial oxygen pressure difference (AaDO (2)) in predicting the short-term prognosis of acute pulmonary embolism (PE). METHODS AND RESULTS: This study retrospectively enrolled 114 consecutive patients with acute PE, diagnosed by either spiral computed tomography or high probability ventilation - perfusion lung scans. During the first 24 h of admission, all patients had initial artery blood gas collected under room air. Patient exclusion criteria were chronic lung disease, septic emboli, and moderate and low probability lung scans. Patients were assigned to 2 groups based on either 30-day death or a 30-day composite event. Receiver operating characteristic analyses was used to determine the AaDO(2) cut-off value for predicting primary and composite endpoints. Statistical analysis demonstrated significant differences in AaDO(2) between the 30-day composite endpoint group and the 30-day composite event-free survival group (p=0.012). The AaDO(2) had a strong trend between the 30-day death group and the survival group (p=0.062). The best cut-off value for AaDO(2) was 53 mmHg and using this, the positive predictive value for 30-day death was 25% and the negative predictive value was 92%. For the 30-day composite endpoint, the positive predictive value for AaDO(2) was 35%, and the negative predictive value was 84%. In this study, thrombocytopenia was also an indicator of poor prognosis for patients with acute PE. CONCLUSION: The AaDO(2) measurement is a highly useful and simple measurement for predicting short-term prognosis in patients with acute PE. It has high negative predictive value and moderate positive predictive value for 30-day death and 30-day composite event. Aggressive thrombolytic treatment strategies should be considered for patients with an initial poor prognostic parameter (ie, AaDO(2) >or=53 mmHg).     

Multicoil Dixon chemical species separation with an iterative least-squares estimation method.

This work describes a new approach to multipoint Dixon fat-water separation that is amenable to pulse sequences that require short echo time (TE) increments, such as steady-state free precession (SSFP) and fast spin-echo (FSE) imaging. Using an iterative linear least-squares method that decomposes water and fat images from source images acquired at short TE increments, images with a high signal-to-noise ratio (SNR) and uniform separation of water and fat are obtained. This algorithm extends to multicoil reconstruction with minimal additional complexity. Examples of single- and multicoil fat-water decompositions are shown from source images acquired at both 1.5T and 3.0T. Examples in the knee, ankle, pelvis, abdomen, and heart are shown, using FSE, SSFP, and spoiled gradient-echo (SPGR) pulse sequences. The algorithm was applied to systems with multiple chemical species, and an example of water-fat-silicone separation is shown. An analysis of the noise performance of this method is described, and methods to improve noise performance through multicoil acquisition and field map smoothing are discussed.     

小儿重复肾合并其他尿路畸形（附60例报告）

６０例重复肾中，４８例合并输尿管口异位，７例合并输尿管囊肿，４例伴巨大输尿管积水，５例合并肾发育不良，１例为肾积水。年龄４个月～１３岁。临床表现：滴沥性尿失禁４８例，尿路感染１０例，腹部包块６例，排尿困难５例，尿道口有肿物脱出４例。诊断主要依靠ＩＶＵ。５８例经手术治疗，其中５１例作患侧上肾部及输尿管切除，７例行患侧肾切除。术后除１例尿内仍有异常外，均恢复满意。