High-resolution MR imaging with local coils

We propose the following rules to govern the choice of local coils by the practicing radiologist: 1. Smaller coils permit smaller FOVs and better resolution. The coil should be as small as possible. 2. Match the ROS of the coil to the FOV, which will be determined by the anatomic region of interest. 3. For the case of a choice between surface coils or between a surface and a whole- or partial-volume coil, the anatomic region should lie on the high side of the crossover point. For the case of a choice among whole-volume coils, the smallest coil that surrounds the region of interest should be chosen. 4. Considerations in regard to the anatomic shape or the need to vary the position of the structure may alter the choice of coil from that obtained by S/N considerations alone.     

国产沉香化学成分的研究——Ⅲ.异白木香醇的结构测定和低沸点成分的分离与鉴定

自国产沉香(Aquilaria sinensis)[瑞香科(Thymeleaceae)植物]的挥发油中,经硅胶柱层析和离心薄层层析分离得到一新的倍半萜,命名为异白木香醇(isobaimuxinol),根据光谱(IR,~1HNMR,~(13)CNMR,2 D-NMR和MS)分析确定其结构式为(Ⅰ)所示,并用X-光衍射晶体解析进一步确定了其立体化学。同时,也从该植物挥发油的低沸点部分分离得到四个已知化合物:苄基丙酮,对甲氧基苄基丙酮,茴香酸和β-沉香呋喃。这些化合物均为首次从该植物中得到。     

EMPHYSEMATOUS PYELONEPHRITIS RESPONDING TO MEDICAL THERAPY

We describe two type 2 diabetic patients with unilateral emphysematous pyelonephritis who responded to medical treatment alone. Escherichia coli was isolated in both patients. The presence of gas was confirmed early by ultrasound and CT scan of abdomen. Following treatment, good functional recovery was demonstrable in the affected kidneys by isotope renogram. We stress the need for early diagnosis of this condition and aggressive treatment with broad spectrum antibiotics.     

Polyethylene glycol versus low-ionic-strength solution in pretransfusion testing: a blinded comparison study

BACKGROUND: Polyethylene glycol (PEG) has been shown to potentiate antigen-antibody reactions. STUDY DESIGN AND METHODS: To investigate the utility of PEG in pretransfusion testing, a blinded comparison study of PEG and a low-ionic-strength additive solution (LISS) was conducted. A total of 500 patient samples were tested in parallel with reagent antibody-detection cells using blind-coded PEG and LISS potentiators. RESULTS: In 34 (34%) of 100 samples with known antibodies in the Rh, Kell, Duffy, Kidd, and MNS systems, PEG antiglobulin reactions were stronger (total score, 382) than LISS antiglobulin reactions (total score, 216), and in 66 cases (66%), they were equal to those of LISS. Of 400 samples without detectable antibodies, 384 were negative with PEG and LISS, and 16 were positive in PEG tests and negative in LISS. Seven of the 16 were clinically important antibodies (D, 1; E, 3; Fya, 1; Jka; 1; Jkb, 1), and four were clinically benign antibodies (Le(a), 2; McCc, 1; Sda, 1). Five of the 16 demonstrated inconclusive PEG reactions, for a false-positive rate of 5 in 400 (1.3%). Of the 500 samples, none was negative in PEG tests and positive in LISS (0% false-negative rate). CONCLUSION: Although PEG demonstrates a relatively high false-positive rate, PEG is more sensitive than LISS in detecting clinically significant antibodies.     

大黄苷元联合溶栓对血栓栓塞性脑缺血大鼠肺胃损伤的保护作用

目的:观察大黄苷元联合溶栓治疗对大鼠脑缺血损伤肺胃组织的保护作用。方法:实验于2005-08/2006-07在河南中医学院老年医学研究所实验室完成。①260只SD大鼠采用随机数字法分为假手术组20只、模型组60只、尿激酶组60只、大黄苷元组60只、大黄苷元 尿激酶组60只;除假手术组外,其余各组根据缺血后动脉用药时间又各分为3,6,9h3个时间点,每个时间点20只。②自体血栓结合线栓阻塞大鼠大脑中动脉制备局灶性脑缺血动物模型。③各组大鼠均于术前4d灌胃用药,大黄苷元组、大黄苷元 尿激酶组用大黄苷元灌胃(灌胃体积为每100g大鼠1mL),假手术组、模型组和尿激酶组用等体积的生理盐水灌胃;动脉用药除假手术组外,其余各组分别于造模后3,6,9h经导管由区域动脉给药,尿激酶组与大黄苷元 尿激酶组用尿激酶(用药体积为20μL),模型组和大黄苷元组区域动脉用同等体积的生理盐水。④动脉给药后24h,观察大鼠脑组织病理损伤、颅内和胃出血率、脑和肺组织含水量、肺和胃病理损伤变化。结果:实验过程中因麻醉、操作等原因死亡及剔除大鼠156只,进入结果分析104只。①颅内和胃出血率:尿激酶组9h大鼠颅内出血率较模型组高(66.67%,28.57%,P<0.05);尿激酶组9h脑和胃出血率较3h高(脑:66.67%,18.75%;胃:41.18%,17.65,P<0.05);大黄苷元 尿激酶组9h颅内出血率较尿激酶组9h低(P<0.05)。②脑和肺及胃组织病理改变:各模型组大鼠脑、胃和肺组织病理损伤均较假手术组明显;各用药组脑和肺组织分别较相应时间模型组减轻;各组脑、胃和肺组织损伤9h均较其3h明显;大黄苷元 尿激酶组9h较相应时间点尿激酶组和大黄苷元组损伤减轻(P<0.05)。③脑和肺组织含水量:各模型组脑和肺组织含水量均较假手术组增高(P<0.01);尿激酶组和大黄苷元 尿激酶组各时间点均较模型组降低(P<0.01);各组9h分别较其3h脑和肺含水量增加(P<0.01,P<0.05);大黄苷元 尿激酶组6h脑组织和9h肺含水量分别较尿激酶组降低(P<0.05)。结论:脑缺血后延迟溶栓治疗可引起大鼠脑和胃出血率增高、脑组织和肺组织水肿加重,脑和肺及胃组织病理损伤明显;大黄苷元联合溶栓可降低脑出血率,改善神经细胞超微结构,降低脑和肺组织含水量,对脑缺血肺和胃组织损伤具有保护作用。     

猪胸腰段脊髓火器贯通伤后p53基因的早期表达

目的:建立家猪胸腰段脊髓火器贯通伤模型和改良Allen's打击伤后全瘫模型,观察伤后促凋亡基因p53基因的早期表达。方法:实验于2005-05/08在解放军第一七五医院实验室完成。取健康雄性家猪20只,单纯随机分为3组:①火器伤组:9只,在全麻状态下制作胸腰段(L1～L2)脊髓火器伤模型,分为伤后1,3,6h3个时间处死。②打击伤组:9只,L1节段脊髓行改良Allen’s打击,致伤力为500g·cm,处死时间同前。③空白对照组:2只,只麻醉,不造模,伤后6h处死。伤后不同时间点(伤后1,3,6h)和不同节段(伤点、近伤点、中伤点及远伤点)取材,采用SP法进行P53蛋白免疫组化染色,用TJTY-300型全自动图像分析仪测量P53免疫组织化学染色阳性物质吸光度。结果:经补充后20只猪进入结果分析。①脊髓损伤后3h打击伤组伤点,火器伤组近伤段脊髓P53蛋白的表达高于空白对照组(P<0.001),随着时间推移,打击伤组和火器伤组P53蛋白的表达呈升高趋势(P<0.001),且火器伤组要高于打击伤组(P<0.0001)。②在脊髓损伤后6h,打击伤组仅在伤点和近伤段P53蛋白的表达高于空白对照组(5.57±0.82,3.21±0.43,P<0.05),而火器伤组近伤段、中伤段及远段伤均高于空白对照组(6.46±0.66,4.27±0.39,1.16±0.17,P<0.05)。结论:①细胞凋亡基因p53在脊髓损伤中的表达有一定的时空性,在脊髓损伤后3h出现P53蛋白表达量的增加。②脊髓火器伤的波及范围较打击伤更为广泛。     

Utilization of target-specific, hypersensitive strains of Saccharomyces cerevisiae to determine the mode of action of antifungal compounds

Target-specific hypersusceptible strains of Saccharomyces cerevisiae were used to screen antifungal compounds. Two novel Erg7p inhibitors were identified, providing proof of principle of the approach taken. However, observed hypersensitivities to antifungals acting via other targets imply that use of this tool to identify the mode of action requires significant deconvolution.     

腰椎定点牵压与硬膜外隙注药疗法单独或联合应用治疗腰椎间盘突出症

目的:对比观察硬膜外隙注药与腰椎定点牵压疗法及其联合应用治疗腰椎间盘突出症的疗效。方法:①选择2004-01/2006-01解放军总医院康复医学科门诊诊治的腰椎间盘突出症患者180例,男125例,女55例,年龄20～65岁。患者对治疗方案知情同意。按随机数字表法将患者分为3组:硬膜外隙注药组、腰椎定点牵压疗法组、联合治疗组,每组60例。硬膜外隙注药组:骶管注射利多卡因注射液、胞二磷胆碱、维生素B12、地塞米松混合液,每5d注射1次,共4次。腰椎定点牵压疗法组:采用胸带与下肢固定带牵引,待牵引床启动逐渐使患者腰脊柱拉伸时,术者双手拇指关节突关节连线,由上腰段向腰骶段滑行推压,当拇指推压到病变间隙时,牵引力须达到患者体质量1.5倍左右,迅速向脊柱前方施压。共2次。联合治疗组为两种疗法联合应用。每2次硬膜外隙注药后施行腰椎定点牵压疗法疗法1次,共2次。②于治疗前和治疗后3,6个月采用疼痛强度评分评估疼痛程度(0～10分,0分为无痛,10分为最痛),治疗前和治疗后3个月观察临床体征和评估疗效,疗效评估依据胡有谷的腰椎间盘突出症和国家中医药管理局(1994年)制定的中医病症诊断疗效标准。③计量和计数资料差异比较分别采用t检验和χ2检验。结果:腰椎间盘突出症患者180例均进入结果分析。①疼痛强度变化:治疗后3个月3组疼痛强度评分均较治疗前降低,其中联合治疗组与治疗前比较,差异明显(χ2=2.13,P<0.01)。治疗后6个月,各组病例的疼痛症状大多数获得控制,其中联合治疗组疼痛强度评分与治疗前比较,差异明显(χ2=4.03,P<0.01),联合治疗组和硬膜外隙注药组疼痛强度评分明显低于腰椎定点牵压疗法组(χ2=5.62,6.16,P<0.05)。②临床体征变化:各组治疗后3个月4项体征均较治疗前改善,其中联合治疗组直腿抬高试验阳性患者数明显少于硬膜外隙注药组和腰椎定点牵压疗法组(7,19,14例,χ2=9.24,9.14,P<0.01)。③疗效:联合治疗组治疗有效率明显高于其他硬膜外隙注药组和腰椎定点牵压疗法组[100%(60/60),88%(53/60),92%(55/60),χ2=6.26,6.04,P<0.01],而其他2组间比较,差异不明显(χ2=8.63,P>0.05)。结论:硬脊膜外注药及腰椎定点牵压疗法均是治疗腰椎间盘突出症的有效疗法,联合应用疗效更好。