CAJ | 학술논문

目的:运用VFM( Vector Flow Mapping)成像探讨正常成人左心室腔内收缩期血流流场特征.方法:健康成人志愿者40例(男22例,女18例),二维超声取心尖三腔观左室腔彩色血流信息动态图像存贮并脱机分析,将取样线分别置于左室腔基底段、中尖段和心尖段,获取心动周期内经取样线部位左室腔血流时间速度积分(Time-Flow curve, TF)变化曲线,记录基底段、中间段及心尖段收缩早期速度时间积分(ES-TF)、收缩中期速度时间积分(MS-TF)、收缩晚期速度时间积分(LS-TF).观察收缩期血流流场特征,观察涡流出现时间,测量涡流直径(横径Dx,)及涡流的最大向量速度(Vmax).结果:正常人左室心腔血流流场呈规则变化,收缩早期二尖瓣前叶下方可见涡流显示,收缩中期及晚期涡流消失.收缩早、中、晚期,血流时间速度积分测值由心尖段经中间段至基底段逐渐递增,差异均有统计学意义(P<0.05).收缩早期涡流直径约为(25.74±7.32)mm, 涡流最大向量速度均背离探头,大小为(38.31±14.25)cm/s,朝向探头速度大小为(11.42±6.28) cm/s.结论:应用VFM技术可清晰显示左室心腔内血流流场状态,左室腔血流速度积分测值可直观反应心腔内血流动力学变化.
목적:운용VFM( Vector Flow Mapping)성상탐토정상성인좌심실강내수축기혈류류장특정.방법:건강성인지원자40례(남22례,녀18례),이유초성취심첨삼강관좌실강채색혈류신식동태도상존저병탈궤분석,장취양선분별치우좌실강기저단、중첨단화심첨단,획취심동주기내경취양선부위좌실강혈류시간속도적분(Time-Flow curve, TF)변화곡선,기록기저단、중간단급심첨단수축조기속도시간적분(ES-TF)、수축중기속도시간적분(MS-TF)、수축만기속도시간적분(LS-TF).관찰수축기혈류류장특정,관찰와류출현시간,측량와류직경(횡경Dx,)급와류적최대향량속도(Vmax).결과:정상인좌실심강혈류류장정규칙변화,수축조기이첨판전협하방가견와류현시,수축중기급만기와류소실.수축조、중、만기,혈류시간속도적분측치유심첨단경중간단지기저단축점체증,차이균유통계학의의(P<0.05).수축조기와류직경약위(25.74±7.32)mm, 와류최대향량속도균배리탐두,대소위(38.31±14.25)cm/s,조향탐두속도대소위(11.42±6.28) cm/s.결론:응용VFM기술가청석현시좌실심강내혈류류장상태,좌실강혈류속도적분측치가직관반응심강내혈류동역학변화.
Objective:To investigate the blood flow structure and flow dynamics during the ventricular systole stage by Vector Flow Mapping(VFM). Method:There were 40 healthy volunteers (22 male, 18 female)enrolled in this study. The apical three-chamber view and Color Dopper image in left ventricular(LV) were reserved and analyzed off-line. Time-Flow curves (TF) were obtained in cardiac cycle through the sample line in the basal, central and apical areas of LV. TF of early systole(ES-TF), mid-systole(MS-TF) and late systole(LS-TF) were recorded in the basal, central and apical areas of LV. Characteristics of blood flow structure of LV were observed during systolic, emergence time of vortexes, transverse diameters of eddies and maximum vector speed of the eddies. Result:The characteristic of flow structure had regular change in each of the cardiac phases, including early, mid-and late systole. During the early systolic phase, the circular arrangement of the vector (the eddy) was demonstrated at the anterior leaflet of mitral valve. The valves of ES-TF, MS-TF and LS-TF from basal areas to apical areas were gradually increased (P<0.05).The eddy was about (25.74±7.32)mm in diameter, and about (38.31±14.25)cm/s and(11.42±6.28) cm/s in the speed toward and from the outflow.Conclusion:The flow structure and dynamics of LV can be evaluated noninvasively by VFM, especially to obtain the mapping of the flow vector and time flow curve during individual cardiac phases and also to visualize the cardiac function.