Blood flow structure and dynamics, and ejection mechanism in the left ventricle: Analysis using echo-dynamography
Blood flow structure and dynamics, and ejection mechanism in the left ventricle: Analysis using echo-dynamography
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DOI：
10.1016/j.jjcc.2008.05.005
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发表时间：
2008-10-01
影响因子：
2.5
通讯作者：
Kanai, Hiroshi
中科院分区：
文献类型：
--
作者：
Tanaka, Motonao;Sakamoto, Tsuguya;Kanai, Hiroshi
利用我们的“回声动力学”，对10名正常志愿者心室收缩期的血流结构和血流动力学进行了研究。速度矢量分布显示射血时血流沿室间隔呈沿着层流分布。在每个心脏阶段，即收缩早期、中期和晚期观察到特征性流动结构，并且该特征性流动结构是根据壁动态事件产生的，例如蠕动挤压、二尖瓣环平面的铰链样运动、心室的波纹管作用和心室基部漏斗形状的尺寸变化，利用高速扫描回波新技术，通过相位跟踪法测量应变率分布，在断层扫描和显微镜下观察，由流动轴线的分布和沿流动轴线的加速度沿着分布所表示的流动结构。弹射加速有“A”、“B”和“C”三种模式，由瓦特动力学事件产生。“A”沿沿着主流轴线从心尖至流出区出现，“B”沿沿着二尖瓣前叶和分流轴线出现，“C”由二尖瓣后高速涡流产生。通过沿流轴方向沿着的速度梯度定量地估计了加速度的大小。心肌收缩和伸展的宏观和微观变化在心室壁局部系统地出现，有利于形成流动结构，顺利地完成泵功能。(C)2008年日本心脏病学院。由Elsevier爱尔兰有限公司出版。保留所有权利。
Using our "echo-dynamography", blood flow structure and flow dynamics during ventricular systole were investigated in 10 normal volunteers. The velocity vector distribution demonstrated blood flow during ejection was laminar along the ventricular septum. The characteristic flow structure was observed in each cardiac phases, early, mid- and late systole and was generated depending on the wall dynamic events such as peristaltic squeezing, hinge-like movement of the mitral ring plane, bellows action of the ventricle and dimensional changes in the funnel shape of the basal part of the ventricle, which were disclosed macroscopically by using the new technology of high speed scanning echo-tomography and microscopically by the strain rate distribution measured by phase tracking method.The pump function was reflected on the changes in the flow structure represented by the flow axis tine distribution and the acceleration along the flow axis line. The acceleration of the ejection had three modes, "A", "B" and "C", and generated by the watt dynamic events. "A" appeared from the apical to the outflow area along the main flow axis line, "B'' along the anterior mitral leaflet and the branched flow axis tine, and "C'' generated by the high speed vortex behind the mitral valve. The magnitude of the acceleration was estimated quantitatively from the velocity gradient along the flow axis tine. Macroscopic and microscopic asynchrony in the myocardial contraction and extension appeared systematically in the local part of the ventricular watt, which was helpful for making the flow structure and for performing the smooth pump function. (C) 2008 Japanese College of Cardiology. Published by Elsevier Ireland Ltd. All rights reserved.