AIM: To evaluate the reliability of making a research model of coronary artery stenosis and local myocardial infarction reproduced in dog by ligating canine LAD. METHODS: We disparted 30 aged healthy cross-breed dogs [(18.5?6.7) kg] into three groups. The near part of the LAD through left minimal thoracic incision was ligated to interdict 25% (group A), 50% (group B), 75% (group C) of the flux, respectively. The changes of plasma endothelium-derived factors NO, ET-1, sP-selectin and CTnT were measured before ligation and at different time points after ligation. The expression of P-selectin gene in cardiac muscle was detected by Western blotting. The segments of distal parts of the ligated LAD were cut and pathological changes of the patches of topical cardiac muscle were observed by electronic microscope. RESULTS: After ligation, NO/ET-1, P-selectin and CTnT had significant changes in group B (P

Objective To investigate the possible pathogenesis of type 2 diabetes mellitus (T2DM) combined with Alzheimer's disease (AD). Methods Wistar rats were randomly divided into control, T2DM, AD and T2DM +AD groups. The blood glucose levels were assayed, and the behavior changes were tested by Morris water maze. The glycogen synthase kinase-3β (GSK-3β) and hyperphosphorylation of tau protein were detected by immunohistochemistry staining. Results Compared with the control rats, the learning and memory abilities were weakened significantly in the model rats (F=28. 65, P<0.001). The expression of GSK-3β was higher in T2DM + AD group (4319. 02±653. 24) than in AD group (304. 39 ± 175. 83), T2DM group (540.43 ± 558.49) and control group (315. 56 ± 91. 64, H=19. 335, all P<0. 01). The level of hyperphosphorylation of tau protein was significantly increased in T2DM + AD group (8583. 81 ± 2236. 11) and AD group (2799. 61±1070. 02) than in control group (252. 02 ± 58. 37) and T2DM group (287. 75 ± 192. 53, H=32. 950, P< 0.001). There was no significantly difference of hyperphosphorylation of tau between T2DM group and control group (H = 32. 950, P>0. 05). Conclusions The increasing of GSK-3β activity in T2DM may be caused by hyperphosphorylation of tau.

Objective To evaluate the efficacy and prognostic factors of radiotherapy in 162 patients with stage I and II non-small cell lung cancer(NSCLC).Methods Between December 1982 and August 1992, 168 patients with stage I and II NSCLC were treated, with 116 confirmed by histopathology and 52 by cytopathology. All patients received radiotherapy to a dose of 40-76 ?Gy and were followed up for more than five years. Results The overall 1-, 3- and 5-year survival rates were 67.6%, 28.0% and 15.7%. Absence of concurrent disease and Karnofsky performance status ≥80 were favorable prognostic factors. Conclusions Radiotherapy is effective for stage I and II non-small cell lung cancer patients who are contraindicated for surgery. Higher dose of radiotherapy is recommended to improve the local control and survival rate.

Objective To investigate the changes of IL-6, IL-10 and TNF-αafter cholecystectomy.Methods 46 cases with cholecystolithiasis were selected and divided into 2 groups.23 in control group were treated with open cholecystectomy, experimental group were treated with laparoscopic cholecystectomy.The levels of IL-6, TNF-α, IL-10 and CD4 +/CD8 +T were compared in the two groups pre-and post-treatment.ResuIts Compared with pre-treatment, two groups of patients with IL-10, TNF-α, IL-6 and CD4 +T and CD4 +/CD8 +T increased (P<0.05), compared with control group, experimental group IL-10, TNF-α, IL-6, CD4 +/CD8 +T levels were higher (P<0.05).ConcIusion Laparoscopic cholecystectomy can significantly reduce the IL-6, TNF-αand IL-10 levels, reduce the body′s stress response to surgery, and reduce blood flow, shorten the operation time.

The threat of cancer to human being' s health is definite.In order to find more effective cures,experts has always taking the mechanism of tumorigenesis as a research foucus and hot spot.As everyone knows,the basic biological behaviors of malignant cells have changed a lot,such as cell proliferation,apoptosis,and so on,and the causes are related to the aberrant methylation reaction occurred in these cells.Researchers have found out that DNA methylation in tumor tissues were obviously different from that in normal tissues,with the charateristics of extensive hypomethylation and localized hypermethylation.To identify the effect of abnormal methylation reaction in the evolution and progression of tumor,this article is aiming to overview those previously researches about the abnormal methylation reaction in tumor cell and its effect on cell growth.

Intrahepatic cholangiocarcinoma,which occurrence and development involved kinds of cells and genes changes,is a vital part of the primary carcinoma of liver.The cellular origin may includes bile duct epithelial cells,hepatic stem cells and hepatic cells.The macroscopic type may includes:nass-forming types,periductal infiltrating types,intraductal growth types.The fact was revealed that different macroscopic type of intrahepatic cholangiocarcinoma has different clinical features,outcomes and prognosis.The author reviewed recently published studies covering various aspects of intrahepatic cholangiocarcinoma,focusing especially on the macroscopic subtypes and related cell features,to discover the relaticn between macroscopic type and cellular origin of intrahepatic cholangiocarcinoma and better understand the pathogenesis of intrahepatic cholangiocarcinoma.

ObjectiveTo evaluate the accuracy of measurement of left ventricular(LV) volume and function in coronary heart disease(CHD) by real-time three-dimensional echocardiography(RT-3DE) using cardiac magnetic resonance imaging (CMRI).Methods LV end diastolic volume(EDV),LV end systolic volume(ESV) and LV ejection fraction(EF) were measured with RT-3DE in patients with CHD ( n =37) and in the control ( n =30).The results measured by RT 3DE were compared with those of CMRI.The diagnostic value of RT-3DE was evaluated using receiver operating characteristic(ROC) curve.Results Compared with that measured by CMRI,EDV,ESV and EF by RT 3DE( P ＞0.05) were almost similar as that in the control.Area under ROC curve of in EDV and ESV were 0.912 and 0.944 in the control.However,EDV determined by RT-3DE was smaller than that by CMRI( P ＜0.05) in CHD group.A difference (10.95 ± 31.26 ml) was existed in EDV between the two methods.ESV measured by RT-3DE was smaller than that calculated by CMRI( P ＞0.05) with a mean differance of (3.17 ± 16.42)ml in CHD group.EF by RT-3DE( P ＞0.05)was almost as same as that by CMRI in CHD group,with a mean difference of (1.54 ± 11.85)％.The area under ROC curve of EDV and ESV were 0.834 and 0.873 in CHD group and their diagnostic performance was moderate.ConclusionsMeasurment of LV volume and function by RT 3DE in control was more acurrate than that in CHD.In the cases of LV remodeling in patients with CHD,RT-3DE would underestimate the LV volume.

Objective To compare the distribution of collagen type Ⅲ and Ⅳ in mucosa of normal and carcinoma cardiac tissues and to analyze the influence of changed collagen on auto-fluorescence after canceration.Methods Using immunohistochemical technique with monoclonal anti-collagen typeⅢ and Ⅳ,the difference of distribution in extracellular matrix of two types collagen between normal and carcinoma tissues from 16 patients were measured with semi-quantitative score methods.Results In normal mucosa,the epithelial basement membrane showed an intense positive reaction for monoclonal anti-collagen Ⅳ and an intensively stained ring band was formed around the grand basement membrane.The collagen type Ⅲ formed ring-like structures apparently representative of fibriform collagen immediately adjacent to the epithelial basement membrane.In carcinomatous mucosa,immunoreaction of the carinomatous cell nest was negative,and only remnants of positively were seen at the site of the former membrane by collagen type Ⅳ.The change of collagen type Ⅲ was not apparent and the positive reaction in carcinomatous stroma was more intensity than in normal stroma.There was significant difference in distribution of collagen type Ⅲ and Ⅳ between the normal and carcinomatous tissues(P

Based on force sensing resistor (FSR) sensor, we designed insoles for pressure measurement, which were stable and reliable with a simple structure, and easy to wear and to do outdoor experiments with. So the insoles could be used for gait detection system. The hardware includes plantar pressure sensor array, signal conditioning unit and main circuit unit. The software has the function of data acquisition, signal processing, feature extraction and classification function. We collected 27 groups of gait data of a healthy person based on this system to analyze the data and study pressure distribution under various gait features, i.e., walking on the flat ground, uphill, downhill, up the stairs, and down the stairs. These five gait patterns for pattern recognition and classification by K-nearest neighbors (KNN) recognition algorithm reached up to 90% accuracy. This preliminarily verified the usefulness of the system.
Algorithms ; Biomechanical Phenomena ; Foot ; Gait ; Humans ; Pressure ; Signal Processing, Computer-Assisted ; Software ; Walking

In order to realize the guide wire tele-manipulation in intervention operation, a method for guide wire motion detection with laser mouse sensor is proposed and experiments are carried out. On that basis, a guide wire tele-manipulation system which consists of guide wire detection appliance, guide wire manipulation appliance, and master slave type software is designed. Experiments are conducted on the system and acquired needed data, so that relationships between operating time and the distance from guide wire tip to destination and the angle are analyzed. The results validate the feasibility of the system and provide good foundation for future research.
Catheterization ; instrumentation ; methods ; Embolization, Therapeutic ; instrumentation ; Equipment Design ; Lasers