液氮保存同种带支架人工瓣膜流体力学测试

In vitro hemodynamic evaluation of the cryopreserved stented homograft bioprosthetic heart valve

目的 利用脉动流模拟实验装置测试液氮保存同种带支架瓣膜流体力学性能 ,同时与国产perfect牛心包人工瓣膜对比研究。 方法 采集同种瓣膜 ,缝制成 2 1# 、2 3# 、2 5 # 同种带支架主动脉和同种带支架肺动脉人工瓣膜 ,经液氮保存 ,使用国产脉动流实验装置测试瓣膜流体力学性能 ,采用ISO/FDA评估标准 ,分别测量各流量下的跨瓣压差、有效瓣口面积 (EOA)和回流比。并与相应型号国产 perfect牛心包人工瓣膜对比研究。结果 2 1# 、2 3# 、2 5 # 同种带支架主动脉和肺动脉瓣膜的跨瓣压差和回流百分比差异无显著性 ,但较 perfect瓣大。同种带支架主、肺动脉瓣膜的EOA差异无显著性 ,但较 perfect牛心包生物瓣膜的略小些。同种带支架瓣膜实际开口面积 (AOA)小于 perfect牛心包瓣 ,但有效瓣口面积 /实际开口面积比值无差别。结论 同种带支架主动脉和肺动脉人工瓣膜流体力学性能满意 ,同种带支架主动脉瓣膜与同种带支架肺动脉瓣膜流体力学性能无差别。

Objective: To evaluate hemodynamic function of the cryopreserved stented homograft bioprosthetic valve , compared to Perfect bovine pericardial bioprosthetic heart valve. Methods: Three sorts of stented homograft aortic and pulmonary valve (21 #, 23 #, 25 #) preserved by liquid nitrogen were prepared. In vitro pulsatile flow tests were performed on the valve in accordance with ISO/FDA guideline. Effective orifice area (EOA), transvalve pressure gradient and regurgitation ratio were recorded at various flow volume, compared with Perfect bioprosthetic valve. Results: There was no difference between the transvalve pressure gradient of the stented homograft aortic and pulmonary valve, but they were higher than Perfect bioprosthetic valve. The stented homograft aortic and pulmonary valve showed the larger regurgitation ratio than perfect valve, but there was no difference between two types of valve. EOA of the stented homograft aortic and pulmonary valve were smaller than Perfect valve's, there was no discrepancy between them. Though actual orifice area (AOA) of the stented homograft valve was smaller than Perfect's, but EOA/AOA ratio was no difference between two types of valve.Conclusion: The stented homograft valve has satisfactory hemodynamic performance. There is no significant discrepancy between homograft aortic and pulmonary valve's hemodynamic function.