结核分枝杆菌Ag85B/GST融合蛋白表达载体构建及在大肠杆菌中的表达

目的 构建结核分枝杆菌Ag85B／GSF融合蛋白表达质粒，并在大肠杆菌(E．coli)中诱导表达。方法 以质粒pUC18／Ag85B为模板，用PCR法扩增结核杆菌Ag85B基因，扩增的Ag85B上游含有EcoR Ⅰ酶切位点，下游含有SalⅠ酶切位点；将Ag85B基因定向插入质粒pGEX-4T-1中，构建原核表达质粒pGEX-Ag85B并转化E．coli B121，筛选阳性重组子，限制性内切酶切鉴定和DNA序列测定，异丙基硫代半乳糖苷(IPTG)诱导表达，SDS-PAGE和Westem blot鉴定结果。结果 成功构建原核表达质粒pGEX-Ag85B并表达出Mr约56000大小的Ag85B／GSY融合蛋白，表达量占总菌体的30％。结论 为进一步进行纯化Ag85B蛋白和研究其在膀胱肿瘤治疗中的作用奠定了基础。     

严重肺挫伤早期肺泡灌洗液表面活性蛋白变化与肺功能及形态学改变的关系

目的探讨严重肺挫伤及缺血再灌注后早期肺泡灌洗液（BALF）中表面活性蛋白（SP）-A、B、C、D动态变化与肺功能及肺形态学改变的关系。方法75只兔随机分为对照组（A）、肺挫伤组（B）及缺血再灌注组（C）。每组均为25只。检测各组0，1，2，3，4h肺功能变化及BAIF中SP—A、B、C、D含量百分比，进行组织病理学及电镜检查。结果与A组比较，B、C组sSP—A、B、C、D含量百分比明显减少（P〈0．01）；肺功能出现明显的损害且呈持续下降（P〈0．05）；肺泡Ⅱ型细胞电镜及病理学检查呈不同程度的炎症及变性改变。结论严重肺挫伤BALF中SP—A、B、C、D动态变化与肺功能及肺组织病理学改变一致。     

肺血管扩张在肝肺综合征发病机制中作用的研究进展

肺血管扩张是肝肺综合征的主要发病机制,然而导致HPS肺血管扩张的机制相当复杂,至今仍不清楚.目前认为肺血管内巨噬细胞聚积和雌激素升高导致的血管活性因子增多和活性增强可能与此有关,近年来这方面的研究很多,本文对此作一综述.     

静脉溶栓联合导管碎栓和切栓治疗急性大面积肺栓塞

目的评价静脉溶栓联合导管碎栓和切栓治疗急性大面积肺栓塞的临床疗效和安全性。方法对19例急性大面积肺栓塞患者，采用下腔静脉滤器置入、肺动脉导管碎栓和静脉溶栓加低分子肝素抗凝治疗，19例中4例加用了Straub Rotarex导管血栓旋切术。结果19例共行21次治疗。18例经介入治疗后胸闷、紫绀症状均明显改善，肺动脉中央分支血流恢复通畅，血氧饱和度由术前平均86％（74％～96％）上升到治疗后的平均97％（94％～100％）。肺动脉压力从术前的（334-5）mmHg（1mmHg=0．133kPa）下降到术后的（254-5）mmHg（t=13．2，P〈0．01）。l例双侧肺动脉主干大块血栓栓塞的患者，介入治疗无效，后经胸外科手术取栓未能成功，患者死亡。4例成功地采用了Straub Rotarex旋切治疗肺动脉血栓，未出现并发症。结论采用导管碎栓和血栓旋切等介入技术联合静脉溶栓抗凝治疗，是治疗急性大面积肺动脉栓塞的有效而且安全的方法。     

蛇毒治疗不能解释肺动脉高压的研究

本通过对不能解释的肺动脉高压患，进行右心导管测定肺动脉平均压（ＰＡＭＰ）作为主要对照指标，观察蛇毒制品（精制溶栓酶）的急性药物试验和近期药物试验。发现该药物在近期有理想的降低ＰＡＭＰ作用，症状及胸片、超声心动图异常也明显取得改善，提示其可能为治疗该病的理想药物。     

Catheter embolization of pulmonary arteriovenous fistulas in an infant

Summary An infant with pulmonary arteriovenous fistulas is described. Surgical ligation of the fistulas and limited resection of paraenchyma from the right lung was followed at 11 months of age, by successful steel coil embolization of residual fistulas.     

Medium term outcome for infant repair in tetralogy of Fallot: indicators for timing of surgery

Objective: To assess the impact of early corrective surgery on the short and medium term outcome in tetralogy of Fallot (TOF). Materials and methods: All patients under 12 months of age undergoing correction of isolated TOF between February 1997 and July 2003 were reviewed retrospectively. Outcome data for mortality, post-operative care management, major morbidity and clinical follow-up were analysed. Results: Fifty-two operations were performed. The mean age at surgery was 5 months (range 1–12) of whom 16 (30.8%) were less than 3 months old, including 2 neonates, 22 (42.3%) were 3–6 months old and 14 (26.9%) were 7–12 months old. There was 1 (1.9%) early death caused by a cerebro-vascular accident and 1 (1.9%) late death secondary to acute infective endocarditis. There were no differences in post-operative morbidities attributable to age. Patients under 3 months old required greater duration of post-operative ventilation, ITU stay and in-hospital stay. At a mean follow-up of 4.0 years (range 1.5–8.0), 33 (63.5%) patients had well-tolerated pulmonary regurgitation (PR) and 3 (5.8%) patients required re-operation for right ventricular outflow tract obstruction (RVOTO). All patients had right bundle-branch-block but with QRS < 150 ms. Conclusion: Early definitive repair of TOF can be performed safely on patients under 6 months old. Age at surgery does not appear to affect the medium term haemodynamic outcome. However, early surgery does escalate the need for ICU care. This data suggests repair in asymptomatic patients be delayed until 3–6 months of age.     

Influence of melatonin on bovine pulmonary vascular and bronchial airway smooth muscle tone

The influence of melatonin on tension of isolated bovine pulmonary vascular and bronchial smooth muscle rings were examined in these experiments. Melatonin caused a dose-dependent relaxation of precontracted (30 mM KCl) pulmonary artery and vein, although the effect is greater in arterial smooth muscle. This relaxant response was blocked by preincubating vessels with antagonists of vasoactive intestinal peptide or Substance P. In bronchial smooth muscle, melatonin caused a small contractile response. These experiments demonstrate that in response to melatonin the pulmonary vasculature relaxes, while in airway smooth muscle the reverse, constriction, occurs. It is hypothesized that nocturnal exaggeration of asthma may, in part, be due to changes in circulating levels of melatonin.     

Patterns of calcifications and cholangiographic findings in hepatobiliary tuberculosis

The radiologic findings on conventional examinations (plain films and cholangiograms) in a large group of patients with proven hepatobiliary tuberculosis are reviewed. The plain film findings of large chalky and confluent hepatic calcifications or nodal-type calcifications along the course of the common bile duct are suggestive of hepatobiliary tuberculosis. Small, discrete, scattered calcifications may be mimicked by histoplasmosis but can be differentiated from hepatobiliary tuberculosis. Obstructing defects seen on cholangiography are indicative of tuberculosis when adjacent calcifications are present. The patterns of liver calcifications could provide a clue to the diagnosis of hepatobiliary tuberculosis and its differentiation from liver calcifications of various other etiologies.