Wang J.-L.,Heji Hospital Affiliated to Changzhi Medical School |
Yin L.-X.,Peoples Hospital of Sichuan Province |
Fei L.-P.,Heji Hospital Affiliated to Changzhi Medical School |
Niu Q.-Y.,Heji Hospital Affiliated to Changzhi Medical School |
Li W.-H.,Peoples Hospital of Sichuan Province
Chinese Journal of Tissue Engineering Research | Year: 2014
BACKGROUND: Acute myocardial infarction with acute onset is dangerous, but the aided diagnosis for hyperacute disease mainly depends on electrocardiogram. The advantages of tissue Doppler strain imaging were utilized to help early diagnosis of acute myocardial infarction. OBJECTIVE: To observe left ventricular transmural peak radial strain and strain time-to-peak of subendocardiac muscle, midmyocardium and subepicardiac muscle using tissue Doppler strain imaging in dogs before and after acute myocardial infarction, and to assess its mechanical characteristics. METHODS: A total of 16 Beagle dog models of acute myocardial ischemia were established by ligating left anterior descending coronary artery. The two-dimensional apical short-axis views of the left ventricle in five complete cardiac cycles were acquired and stored in TDI-Q workstation before and after acute myocardial ischemia. Transmural peak radial strain and strain time-to-peak of segment, subendocardiac muscle, midmyocardium and subepicardiac muscle at infarct region and baseline were observed. RESULTS AND CONCLUSION: Peak radial strains at infarct and subendocardiac muscle, midmyocardium and subepicardiac muscle were decreased compared with the baseline (P < 0.05). Peak strain gradient disappeared in each layer of infarct myocardium. Strain time-to-peak of the whole segment and infarct myocardium at different layers was significantly postponed (P < 0.05). There was a positive correlation of peak radial strain between subendocardium and segment as well as between medium and segment at baseline (r = 0.617, P < 0.01; r = 0.556, P < 0.01). This relationship disappeared at infarct region (r = 0.338, P > 0.05; r = 0.218, P > 0.05). Results indicated that after acute myocardial infarction, peak strain gradient disappeared at different layers at infarct region. Acute myocardial ischemia induces peak radial strain decrease at subendocardium, medium, subepicardium and strain time-to-peak at infarct region was significantly postponed, which reflected abnormal cardiac structure and dysfunction, resulted in uncoordinated cardiac motion and asynchronous heart movement. This may be an important mechanical mechanism triggering heart failure.
Yu J.-L.,Heji Hospital affiliated to Changzhi Medical School |
Li J.-H.,Tumor Hospital of Shanxi Province |
Chengz R.-G.,Heji Hospital affiliated to Changzhi Medical School |
Ma Y.-M.,Shanxi Medical School |
And 2 more authors.
Asian Pacific Journal of Tropical Medicine | Year: 2014
Objective: To observe the preventive and control effect of matrine on transforming growth factor (TGF-β1) and hepatocyte growth factor (HGF) of liver fibrosis tissue in rats. Methods: A total of 48 SD rats were randomly divided into A, B, C, D groups with 12 in each, group A as the normal control group and groups B, C, D as liver fibrosis models using composite modulus method with carbon tetrachloride (CCL4). Group B was the model group, group C adopted γ-interferon lavage therapy in the second day of modeling, and group D adopted matrine lavage treatment, at 4 and 8 weeks after treatment. Six rats were executed for detection of TGF-β1 and HGF, liver tissue histology and comparison fibrosis degree changes of rat liver tissue between groups. Results: Groups B, C, D showed a more significantly increased TGF-β1 at each time point compared with group A (P<0.05); Group B showed a more significantly increased TGF-β1 than groups C and D at weeks 4 and 8 (P<0.05); group D showed a lowest level of TGF-β1, followed by groups C and B. HGF of group B decreased more significantly than A group at weeks 4 and 8 (P<0.05); HGF of groups C and D was significantly elevated at 4 and 8 weeks than groups A and B (P<0.05), in which the group D showed the highest level of HGF. According to tissue histologic observation, rat liver tissue structure of group A was clear and normal, tissue structure of group B was destroyed with obvious fibrous tissue hyperplasia and fatty change of hepatic cells; groups C and D showed a slighter liver tissue damage, cell necrosis and connective tissue hyperplasia in collect abbacy than group B with a trend of obvious improvement. Conclusions: Matrine can reduce TGF-β1 expression and enhance the activity of HGF, so as to realize the inhibition effect on liver fibrosis in rats. © 2014 Hainan Medical College.