显微精索静脉结扎手术联合少腹逐瘀汤治疗精索静脉曲张致少弱精子症

目的探讨保留动脉的显微精索静脉结扎术联合少腹逐瘀汤治疗精索静脉曲张(VC)致少弱精子症的临床疗效。方法选取50例精索静脉曲张性不育患者,随机分成观察组和对照组各25例,治疗组给予显微精索静脉结扎手术联合少腹逐瘀汤,日服一剂,分早晚服,连续服用3个月;对照组只行显微精索静脉结扎手术。结果两组患者均手术成功,术后症状消失,精子浓度、精液量、精子活力明显提高,畸形精子百分率明显降低,较手术前比较,差异有统计学意义(P<0.05)。而观察组3个月后患者各项精液参数改善显著,明显优于对照组(P<0.05)。结论显微精索静脉结扎手术联合少腹逐瘀汤治疗精索静脉曲张所致少弱精子症疗效满意,精液质量改善明显。     

苍白球损毁术中微电极的位置识别方法

在治疗帕金森病的苍白球损毁外科手术中,微电极在苍白球中的位置只能通过分析微电极测量的细胞放电特征,依靠主观经验判定。我们以临床微电极信号为基础,利用峰峰时间间隔因子,提出了客观定量的识别微电极位置的方法。该方法能有效的识别出沿微电极针道苍白球组织的变化以及针道是否偏离,识别结果与苍白球解剖结构和手术情况相吻合,此方法可用于临床手术导向。     

武汉生物医药产业重点技术需求分析与建议

摘 要 目的：为武汉生物医药产业发展提供技术服务平台建设等建议。方法: 通过文献检索、实地考察、问卷调查、专家咨询等方法,了解并分析武汉生物医药产业存在的问题及重点技术需求。结果与结论:提出了当前武汉生物医药产业重点技术需求和促进医药产业健康发展的建议。     

内镜超声引导下细针抽吸术诊断消化道周围占位性病变的临床价值及影响因素研究

目的 探讨内镜超声引导下细针抽吸术（EUS-FNA）诊断消化道周围占位性病变的价值及其影响因素。 方法 回顾性分析2009年1月至2016年5月行EUS-FNA的171例患者的临床资料,纳入病灶部位、大小、性状,穿刺次数、穿刺时抽吸负压、穿刺针型号、医师操作经验等因素进行分析。 结果 EUS-FNA诊断消化道周围恶性占位性病变的敏感度、特异度和准确率分别为78.3％（83／106）、100.0％（65／65）、86.5％（148／171）。单因素logistic回归分析示,EUS-FNA诊断恶性占位性病变穿刺阳性率的影响因素有病灶部位、性状、大小。多因素logistic分析示,病灶大小（OR=1.029,95％CI：1.011～1.047,P=0.001）、病灶性状（实性及囊实性/囊性,OR=5.098,95％CI：1.324～19.633,P=0.018）是EUS-FNA诊断恶性占位性病变穿刺阳性率的独立影响因素。171例患者中,术后2例出现发热,1例出现急性胰腺炎,并发症发生率为1.75％（3／171）,经保守对症处理后均好转。 结论 EUS-FNA是一项安全有效、敏感度和准确率高的细胞组织病理诊断手段,在鉴别消化道周围良恶性占位性病变中起重要作用。EUS-FNA诊断恶性占位性病变穿刺阳性率与病灶大小呈正相关,诊断实性恶性占位性病变的穿刺阳性率显著高于囊性病变。     

弥漫型与肠型胃癌临床特征比较研究

Lauren分型因其简便、易行,且能反映肿瘤的生物学特性并提示预后,被西方国家广泛应用。但是目前仍不明确肠型和弥漫型胃癌的区别。对弥漫型与肠型两种类型的胃癌进行比较,分析它们的临床和病理特点,以期为今后研究提供参考。     

Latent source mining in FMRI via restricted Boltzmann machine

Blind source separation (BSS) is commonly used in functional magnetic resonance imaging (fMRI) data analysis. Recently, BSS models based on restricted Boltzmann machine (RBM), one of the building blocks of deep learning models, have been shown to improve brain network identification compared to conventional single matrix factorization models such as independent component analysis (ICA). These models, however, trained RBM on fMRI volumes, and are hence challenged by model complexity and limited training set. In this article, we propose to apply RBM to fMRI time courses instead of volumes for BSS. The proposed method not only interprets fMRI time courses explicitly to take advantages of deep learning models in latent feature learning but also substantially reduces model complexity and increases the scale of training set to improve training efficiency. Our experimental results based on Human Connectome Project (HCP) datasets demonstrated the superiority of the proposed method over ICA and the one that applied RBM to fMRI volumes in identifying task‐related components, resulted in more accurate and specific representations of task‐related activations. Moreover, our method separated out components representing intermixed effects between task events, which could reflect inherent interactions among functionally connected brain regions. Our study demonstrates the value of RBM in mining complex structures embedded in large‐scale fMRI data and its potential as a building block for deeper models in fMRI data analysis.     

Inhibition of human Na(v)1.5 sodium channels by strychnine and its analogs

Strychnine and brucine from the seeds of the plant Strychnos nux vomica have been shown to have interesting pharmacological effects on several neurotransmitter receptors. In this study, we have characterized the pharmacological properties of strychnine and its analogs on human Na_v1.5 channels to assess their potential therapeutic advantage in certain arrhythmias. Among the eight alkaloids, only strychnine and icajine exhibited inhibition potency on the Na_v1.5 channel with the half-maximum inhibition (IC₅₀) values of 83.1 μM and 104.6 μM, respectively. Structure–function analysis indicated that the increased bulky methoxy groups on the phenyl ring or the negatively charged oxygen atom may account for this lack of inhibition on the Na_v1.5 channel. Strychnine and icajine may bind to the channel by cation–π interactions. The substitution with a large side chain on the phenyl ring or the increased molecular volume may alter the optimized position for the compound close to the binding sites of the channel. Strychnine and icajine bind to the Na_v1.5 channel with a new mechanism that is different from TTX and local anesthetics. They bind to the outer vestibule of the channel pore with fast association and dissociation rates at resting state. Strychnine and icajine had little effect on steady-state fast inactivation but markedly shifted the slow inactivation of Na_v1.5 currents toward more hyperpolarized potentials. The property of icajine influencing slow-inactivated state of Na_v1.5 channel would be potential therapeutic advantages in certain arrhythmias.     

消化性溃疡穿孔非手术治疗病例报告及分析

目的探讨消化性溃疡穿孔的非手术治疗。方法回顾我院近年来消化性溃疡穿孔行非手术治疗的病例,并结合文献进行分析。结果十二指肠溃疡单纯穿孔患者非手术治疗均有效,而胃穿孔患者非手术治疗后中转手术。结论十二指肠溃疡单纯穿孔非手术治疗有可能成为一种趋势。     

低放射剂量螺旋CT平扫诊断肾及输尿管结石

目的评价64层螺旋CT低剂量平扫对肾及输尿管结石的诊断价值。方法收集临床疑为肾及输尿管结石患者45例,全部患者行常规标准剂量(120KV,160mAs)和低剂量扫描(120KV,80mAs),扫描范围均保持不变。采用双盲随机法,由2名副主任医师诊断结石的有无、大小、位置、数目及结石的继发梗阻征象及其他临床相关表现,采用配对t检验和秩和检验比较。结果在标准剂量扫描中,34例患者发现结石81个;其中0.5cm的结石20个,0.5～1.0cm的结石29个,1.0cm的结石32个;在低剂量扫描中,33例患者发现结石76个,其中0.5cm的结石17个,0.5cm～1.0cm的结石28个,1.0cm的结石32个;以标准剂量结果为标准,低剂量扫描的准确率为:0.5cm结石的准确率为85%,0.5～1.0cm结石的准确率为93.1%,1.0cm结石的准确率为100%。与标准剂量扫描比较,低剂量扫描放射剂量下降50%,两者差异有统计学意义(P0.05)。结论对于体质量90kg的患者,将球管电流降为80mAs进行螺旋CT平扫可减低患者辐射剂量并保持很高准确性。