Abstract

目的 应用MRI测量人工心脏瓣膜远端血流野及三维图像的描绘,来评价人工心脏瓣膜功能,并为长期随访瓣膜血栓等并发症的出现和发展提供原始资料.方法27例人工主动脉瓣膜置换患者进行MR血流速度测量检查,置换双叶机械瓣20例,单叶机械瓣7例.于升主动脉内距主动脉瓣环0.5、1.0及2.0个人工瓣环直径处进行血流速度测量.应用血流分析及Matlab 6.5软件进行二维及三维血流图形重组.结果16例置换Sorin双叶机械主动脉瓣患者,三维血流图人工心脏瓣膜的形状特点为近似对应于2个瓣孔及2个瓣叶之间缝隙的3个喷射峰;4例置换Sorin双叶机械主动脉瓣患者,出现对应于2个瓣孔的双喷射峰.20例置换双叶机械主动脉瓣患者,血流速度在加速射血相及最大射血相血流速度图变成倾斜.7例置换单叶机械主动脉瓣患者在收缩加速相见对应单叶瓣口的1个主喷射峰.26例反向血流出现在人工瓣膜侧孔的位置.MR血流速度三维图反映了人工心脏机械瓣膜的设计形状.距主动脉瓣环1.0人工瓣环直径处的轴向血流速度图较远端(2.0人工瓣环直径处)及近端(0.5人工瓣环直径处)的轴向血流速度图能更详细反映人工瓣膜的设计形状.结论MR可以无创、直观、在体地了解瓣膜功能,为发现术后并发症奠定基础。

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.