Effect of Omentopexy Combining Autologous Atrial Tissue Patch Cardiomyoplasty for Treating the Chronic Myocardial Infarction in Experimental Rats / 中国循环杂志

ABSTRACT

Objective: To explore the effect of omentopexy combining autologous atrial tissue patch cardiomyoplasty for treating the chronic myocardial infarction (MI) in experimental rats. Methods:The MI model of SD rats was established by left coronary artery ligation. 3 weeks later, the qualiifed animals were randomized into 4 groups for the 2nd operation. ① Control group, the rats only received re-thoracotomy, ② Atrial appendage group, the autologous atrial tissue patch was harvested from left atrial appendage of rats and transplanted to infarcted zone, ③ Omentum group, the omentum of rats was transplanted to infarcted zone through diaphragm and ④ Combination group, the left atrial appendage tissue and omentum were transplanted to infarcted zone together. 4 weeks after the 2nd operation, the cardiac function was evaluated by echocardiography, the size and scar thickness of the infarction were examined by Masson staining, the survival of transplanted atrial tissue and angiogenesis were measured by immunohistochemistry, the protein expressions of VEGF, MMPs and TIMP-3 were examined by Western blot analysis, and the activities of MMPs were identiifed by gelatin zymography. Results:4 week after the 2nd operation, transplanted left atrial appendage tissue only survived in Combination group. The areas of infarction were similar among different groups, P>0.05. Compared with Control group, Combination group had the increased scar thickness (329 ± 33)μm vs (391±31)μm, improved LVEF (47.5 ± 4.5)%vs (57.9 ± 5.8)%, improved LVFS (20.7 ± 2.0)%vs (25.2 ± 3.6)%, all P Conclusion:Omentopexy could improve the angiogenesis and support the survival of transplanted autologous atrial tissue patch, therefore improve the cardiac function in experimental rats with chronic MI.