二维斑点追踪技术评价正常人左心房收缩功能和同步性的初步研究  

Evaluation of left atrial systolic function and synchronization in healthy subjects by two dimensional speckle tracking imaging

作　　者：曹省[1] 郭瑞强[1] 陈金玲[1] 李丽[1] 

机构地区：[1]武汉大学人民医院超声影像科,430060

出　　处：《中华超声影像学杂志》2011年第11期935-939,共5页Chinese Journal of Ultrasonography

摘　　要：目的探讨二维斑点追踪技术（2D-STI）评价正常人左心房收缩功能和同步性的可行性。方法应用2DSTI测量32例健康受试者左心房主动收缩时各房壁（前壁、下壁、后壁、侧壁、房间隔）三节段（基底段、中段、上段）的峰值速度、纵向收缩峰值幅度、径向收缩峰值幅度、纵向应变达峰时间、径向应变达峰时间。结果①左心房收缩时，各房壁间相同水平节段的收缩峰值速度、幅度（纵向和径向）和达峰时间（纵向和径向）差异均无统计学意义（P〉0．05）。②左心房各房壁自身各节段间收缩峰值速度、纵向和径向收缩峰值幅度从基底段到上段递减，除前壁、后壁和房间隔的径向收缩峰值幅度（P分别为0．218，0．258和0．238）外，差异有统计学意义（P〈0．05）。③各房壁自身各节段间比较，除后壁纵向应变达峰时间（P=0．002）和侧壁径向应变达峰时间（P=0．026）外，应变达峰时间差异无统计学意义（P〉0．05）。④纵向和径向收缩整体达峰时间的标准差分别为37．38ms、48．25ms，两个方向运动作为一个整体，其标准差约43．85ms。各房壁同一节段的纵向和径向应变达峰时间没有明显的相关性（r=0．014，P=0．885）。结论左心房收缩时房壁运动具有一定的规律性，总体表现为各房壁收缩峰值速度和幅度从基底段到上段递减的特性，各房壁间相同节段运动达峰时间基本同步。2D-STI可以较准确地评价正常人左心房收缩功能和同步性。Objective To evaluate left atrial systolic function and synchronization by two dimensional speckle tracking imaging（2D-STI） measuring the strain in healthy subjects. Methods Thirty-two healthy subjects were studied. The peak velocity（Vmax）,the peak amplitude of longitudinal and radial strain （Am- LS and Am-RS） ,the peak time of both longitudinal and radial strain（T-LS and T-RS） were acquired in each left atrial wall （anterior, inferior, posterior, lateral and septal） at three levels （basal, middle and apical） during left atrial active contraction by 2D-STI. Results （1） No significant differences were found at the Vmax,Am-LS, Am-RS, T-LS and T-RS among all left atrial walls in the same level （ P 〉 0.05）. （2） The Vmax,Am-LS and Am-RS were decreased progressively from basal to apical, and there were significant differences（ P 〈0.05） except the Am-RS at anterior, posterior and septal（ P = 0. 218,0. 258 and 0. 238, separately）. （3） Compared all levels in each left atrial wall, the T-LS and T-RS showed no significant differences（ P 〉0.05） ,except the T LS at posterior（ P = 0. 002） and the T-RS at lateral（ P = 0. 026）. （4） The standard deviation of the T-LS, T-RS and Tglobe were 37.38 ms, 48.25 ms and 43.85 ms, respectively. There were no significant correlation between T-LS and T-RS in the same segment with r = 0. 014 and P = 0. 885. Conclusions There were some regularity during left atrial active contraction. On the whole,the peak velocity and the peak amplitude were decreased progressively from basal to apical in each atrial wall, and the peak time of strain showed no significant difference in the same level of each left atrial wall. The 2D-STI may paly important roles in the evaluation of left atrial systolic function and synchronization.

关 键 词：超声心动描记术 心房功能 左 斑点追踪显像 

分 类 号：R445.1[医药卫生—影像医学与核医学]