青光眼双滤过手术的临床报告

目的　观察双滤过手术治疗青光眼的疗效。方法　选择 130只眼晚期、绝对期原发性青光眼随机分为两组 ,每组 6 5只眼。 组行双滤过手术 , 组行小梁切除术。结果　术后随访观察 5～ 2 1月 ,平均 (14 .34±4 .35 )个月。 组眼压≤ 2 1m m Hg(1m m Hg=0 .133k Pa) 6 2只眼 (95 .4 % ) ,其中需局部用药 6只眼 (9.2 % ) ,术后平均眼压为 (19.37± 2 .92 ) m m Hg,较术前下降 (33.2 6± 12 .33) m m Hg; 组眼压≤ 2 1mm Hg5 5只眼 (84 .6 % ) ,其中需局部用药 12只眼 (18.5 % ) ,术后平均眼压 (2 2 .6 2± 5 .6 8) m m Hg,较术前下降 (2 7.83± 8.81) m m Hg。两组手术成功率差异有显著性 (P <0 .0 5 )。并发症 : 组 9只眼 (13.8% ) ,其中浅前房 6只眼 (9.2 % ) ,前房积血 3只眼 (4 .6 % ) ; 组 2 2只眼 (33.8% ) ,其中浅前房 15只眼 (2 3.1% ) ,恶性青光眼 2只眼 (3.1% ) ,脉络膜脱离 2只眼 (3.1% ) ,前房积血 3只眼 (4 .6 % )。两组并发症的发生率差异有显著性 (P <0 .0 5 )。结论　青光眼双滤过手术效果好 ,并发症少 ,是治疗青光眼安全有效的手术方法     

心电信号预处理与心电信号分析

本文介绍了在一种便携式心电监护仪器中是如何对心电数据进行预处理和智能分析的．为了适应便携式仪器的特征，我们在心电信号预处理中采用了FFT滤波和滑动平均滤波的方法去除各种干扰并使图像得以平滑，同时采用了差分阈值法提取特征点，考虑到监护仪器的实用性，在心电信号分析阶段，我们采用了分析特征间期异常情况的方法来替代对病症的智能诊断功能。     

如何使小梁切除术后眼压更可控

抗青光眼手术是青光眼治疗的主要方法之一。近年来,抗青光眼手术技术长足发展,微创手术层出不穷,患者及术者对手术预期也日益增高。然而,手术可控性不高导致术后疗效的可预测性不尽如人意。本文针对青光眼房水外引流手术中的小梁切除术,在分析其原理和局限性的基础上,指出手术效果的观察指标及术后眼压的调控方法,以期临床进一步开展相关研究,提高抗青光眼手术的疗效。     

Distraction and target selection in the brain: An fMRI study

To attend successfully, a specification of what is currently relevant is necessary, but not sufficient. Irrelevant stimuli that are also present in the environment must be recognized as such and filtered out at the same time. Using functional magnetic resonance imaging, we showed that posterior brain regions in parietal, occipital and temporal cortex are recruited in order to ignore distracting visual stimuli, while the specification and selection of relevant stimuli is associated with differential activity in frontal cortex and hippocampal areas instead. The results thus suggest that the selection of relevant objects can be anatomically dissociated from the handling of competing irrelevant objects. The dissociation between the increased involvement of parietal and occipital cortex in handling distraction on one hand, and that of frontal cortex in target specification on the other provides neurophysiological support for models of attention that make this functional distinction.     

Partial least squares and logistic regression random-effects estimates for gene selection in supervised classification of gene expression data

Our main interest in supervised classification of gene expression data is to infer whether the expressions can discriminate biological characteristics of samples. With thousands of gene expressions to consider, a gene selection has been advocated to decrease classification by including only the discriminating genes. We propose to make the gene selection based on partial least squares and logistic regression random-effects (RE) estimates before the selected genes are evaluated in classification models. We compare the selection with that based on the two-sample t-statistics, a current practice, and modified t-statistics. The results indicate that gene selection based on logistic regression RE estimates is recommended in a general situation, while the selection based on the PLS estimates is recommended when the number of samples is low. Gene selection based on the modified t-statistics performs well when the genes exhibit moderate-to-high variability with moderate group separation. Respecting the characteristics of the data is a key aspect to consider in gene selection.     

2008～2010年上饶市滤除自细胞血液在临床输血中的应用

目的研究滤除白细胞血液前后质量及临床应用效果,为我市全面推广该技术提供实验依据。方法对上饶市县级及县级以上12家医院2008～2010年采用滤除白细胞的血液临床应用效果进行调查,将临床输血病例分为两组：输注滤除白细胞血液的观察组和输注全血即未滤除白细胞血液的对照组;对两组病例输血不良反应作回顾性分析,并对两组病例输血不良反应发生率进行对比。结果对照组共输血1257人次,输血不良反应73例,不良反应率5．807％;观察组共输血1277人次,输血不良反应9例,不良反应率0．705％。过滤后血液白细胞去除率达99．07％,红细胞回收率达92．61％,与过滤前相比差异有统计学意义（P〈0．01）。结论采用滤除白细胞血液进行临床输血可以显著降低非溶血性输血不良反应发生率,有效提高临床输血质量。     

小梁切除术不同结膜瓣滤过泡的形成分析

目的:探讨小梁切除术两种不同结膜瓣术后功能性滤过泡形成情况.方法:比较372例(372只眼)原发性青光眼不同结膜瓣小梁切除术术后功能性滤过泡形成情况,其中以角巩缘为基底的结膜瓣165只眼,以穹窿部为基底的结膜瓣207只眼.结果:术后1周对所有患者进行了观察.3个月时只有127只眼进行了随访.以角巩缘为基底的结膜瓣手术组术后1周滤过泡成功率为83.03%.3个月时为78.69%.以穹窿部为基底的结膜瓣手术组术后1周滤过泡成功率为55.07%,3个月时为53.03%.两组比较有明显差别.结论:本组研究发现.传统的以角巩缘为基底的结膜瓣术后滤过泡成功率高于以穹窿部为基底的结膜瓣,其术后降压效果相应亦较好.     

滤除白细胞血液的质量评价和临床疗效观察

目的探讨白细胞（WBC）滤器过滤悬浮红细胞（RBC）时对血液质量的影响及滤除WBC悬浮RBC的临床疗效。方法随机测定30份滤除WBC悬浮RBC血液的RBC回收率、血小板（PLT）过滤率、WBC滤除率、RBC渗透脆性，并统计分析临床患者输注滤除WBC血液后的输血反应发生率。结果采用WBC滤器过滤法RBC回收率为91．9％，PLT过滤率99．5％，WBC清除率99．96％，滤前和滤后比RBC渗透脆性无统计学差异（P〉0．05），临床患者输用滤除WBC血液后，非溶血性输血反应发生率显著减少（P〈0．01）。结论采用WBC滤器过滤血液后不影响RBC质量，滤除WBC和PLT效率高，能显著降低非溶血性输血反应的发生率，提高临床输血质量和输血安全，节约血液用量。     

Differential binocular input and local stereopsis

Using fractal noise images, we measured the dependence of Dmin and Dmax for stereo on the interocular differences of spatial frequency and contrast. Dmin exhibits a strong dependence on the highest spatial frequency contained in the image, while Dmax exhibits a weaker dependence on the lowest spatial frequency contained within the image. Neither relationship was found to be different when the filtering was restricted to only one eye's image, although the effect of differential lowpass filtering for Dmin was greater than that of binocular lowpass filtering. Contrast is thought to affect stereo performance particularly when it is reduced in only one eye's image. We show that, at least for broadband fractal images representative of everyday natural images, interocular contrast differences are no more disruptive than binocular ones. These results bear upon the nature of the matching process in stereopsis. The fact that these interocular spatial frequency and contrast manipulations do not selectively degrade stereopsis beyond that expected from a consideration of purely monocular effects is consistent with matching occurring within multiple spatial channels prior to their combination.     

青光眼滤过术后前房形成良好的持续性低眼压

目的 观察青光眼滤过性手术后持续性低眼压(<10mmHg)对视功能的影响。方法 回顾性分析滤过性手术后前房形成良好的持续性低眼压病例,对其原因、影响视力因素、低眼压及其并发症的治疗及预防进行分析。结果 52％眼球组织和功能无明显改变;48％因散光、白内障加重及低眼压性黄斑病变而引起视力障碍,通过积极治疗大部分病例视力提高。结论滤过性术后前房形成良好的低眼压不同程度的影响眼视功能,低眼压的持续时间决定低眼压纠正后的视力预后。滤过性术后持续性低眼压通过有效治疗能提高视力且可进行预防。