【摘要】 目的 总结胃间质瘤的诊断及治疗方法。 方法 回顾性分析2005年10月-2009年10月收治的15例胃间质瘤患者的临床资料。 结果 患者的主要临床表现为消化道出血、腹痛、腹胀、贫血等，全部手术切除。主要根据胃间质瘤大小和部位决定手术方式。有6例行胃大部切除，8例行胃楔形切除，1例经腹腔镜行胃楔形切除。 结论 胃间质瘤术前难以明确诊断，确诊有赖于术后病理和免疫组织化学检查，手术切除仍是治疗胃间质瘤的主要手段。【Abstract】 Objective To summarize the clinical experience in diagnosing and treating gastric stromal tumor. Methods The clinical data of 15 patients with gastric stromal tumor admitted from October 2005 to October 2009 was retrospectively reviewed. Results Among these patients, the clinical manifestations mainly included gastrointestinal bleeding, abdominal pain, abdominal flatulence, and anemia. All patients had undergone surgical resections. Mainly based on the size and location of the gastric stomal tumor, a specific operative procedure was decided for each patient. Of these patients, subtotal gastrectomy had been performed on six, gastric wedge resection on eight, and laparoscopic gastric wedge resection on one. Conclusion It is difficult to confirm the diagnosis of gastric stromal tumor before the operation. The diagnosis is usually confirmed by postoperative pathological and immunohistochemical examinations. Surgical resection remains to be the major therapeutic approach for gastric stromal tumor.
The phase lock value(PLV) is an effective method to analyze the phase synchronization of the brain, which can effectively separate the phase components of the electroencephalogram (EEG) signal and reflect the influence of the signal intensity on the functional connectivity. However, the traditional locking algorithm only analyzes the phase component of the signal, and can’t effectively analyze characteristics of EEG signal. In order to solve this problem, a new algorithm named amplitude locking value (ALV) is proposed. Firstly, the improved algorithm obtained intrinsic mode function using the empirical mode decomposition, which was used as input for Hilbert transformation (HT). Then the instantaneous amplitude was calculated and finally the ALV was calculated. On the basis of ALV, the instantaneous amplitude of EEG signal can be measured between electrodes. The data of 14 subjects under different cognitive tasks were collected and analyzed for the coherence of the brain regions during the arithmetic by the improved method. The results showed that there was a negative correlation between the coherence and cognitive activity, and the central and parietal areas were most sensitive. The quantitative analysis by the ALV method could reflect the real biological information. Correlation analysis based on the ALV provides a new method and idea for the research of synchronism, which offer a foundation for further exploring the brain mode of thinking.
【Abstract】 Objective To reduce restenosis in vein grafts after coronary artery bypass grafting, to investigate theeffect of human tissue factor pathway inhibitor(TFPI) gene del ivery on neointima formation. Methods The eukaryotic expressed plasmid vector pCMV-(Kozak) TFPI was constructed. Forty-eight Japanese white rabbits were randomly divided into 3 groups with 16 rabbits in each group: TFPI group, empty plasmid control group and empty control group. Animal model of common carotid artery bypass grafting was constructed. Before anastomosis, vein endothel iocytes were transfected with cationic l iposome containing the plasmid pCMV- (Kozak) TFPI (400 μg) by pressurizing infusion (30 min) in TFPI group. In empty plasmid control group, vector pCMV- (Kozak) TFPI was replaced by empty plasmid pCMV (400 μg). In empty control group, those endothel iocytes were not interfered. After operation, vein grafts were harvested at 3 days for immunohistochemical, RTPCR and Western-blot analyses of exogenous gene expression and at 30 days for histopathology measurement of intimal areas, media areas and calculation of intimal/media areas ratio. Luminal diameter and vessel wall thickness were also measured byvessel Doppler ultrasonography and cellular category of neointima was analyzed by transmission electron microscope at 30 days after operation. Results Human TFPI mRNA and protein were detected in TFPI group. The mean luminal diameter of the TFPI group, empty plasmid control group and empty control group was (2.68 ± 0.32) mm, (2.41 ± 0.23) mm and (2.38 ± 0.21) mm respectively. There were statistically significant differences between TFPI group and control groups (P lt; 0.05). The vessel wall thickness of the TFPI group, empty plasmid control group and empty control group was (1.09 ± 0.11) mm, (1.28 ± 0.16) mm and (1.34 ± 0.14) mm respectively. There were statistically significant differences between TFPI group and other control groups (P lt; 0.01). The mean intimal areas, the ratio of the intimal/media areas of the TFPI group were (0.62 ± 0.05) mm2and 0.51 ± 0.08 respectively, which were reduced compared with those of the two control groups(P lt; 0.05). The mean media areas had no significant differences among three groups (P gt; 0.05). Through transmission electron microscope analyses, no smoothmuscle cells were seen in neointima of TFPI group in many visual fields, but smooth muscle cells were found in neointima of two control groups. Conclusion Human TFPI gene transfection reduced intimal thickness in vein grafts.