计算机检测左心室流出道血流传播速度估测左心室收缩功能的可行性研究

Computer-estimation of propagation velocity of left ventricular outlet tract flow from color M-mode Doppler imaging:a feasibility study

目的为研究复杂先天性心脏病心室功能检测的方法,探讨左室流出道血流传播速度用于估测左室收缩功能的可行性。方法将39例患儿的左室流出道彩色M型血流图传输至计算机。应用自行开发的软件,分辨出初次色彩混叠的波阵面,将该波阵面的点回归成直线,此直线的斜率代表左室流出道血流传播速度。所得结果与心导管数据dp/dtmax相比较。结果左室流出道血流传播速度测得值为(92.3±11.4)cm/s,与心导管测定dp/dtmax一致性好且显著相关(r=0.71,P<0.001)。结论左室流出道血流传播速度可用来评价左室收缩功能,该方法不依赖于心室的几何形态,有望将该方法用于复杂先天性心脏病心室功能的测量。

Objective To determine the feasibility of the computer-estimated propagation velocity of left ventrlcular outlet tract（LVOT） flow for evaluating the left ventricular systolic function. Methods Color M-mode Doppler imagine of LVOT flow was obtained in 39 children and then transferred to computer. The flow wave front of the first aliasing velocity was identified with the computer assisted measurement system（CAMS）, then regressed to a straight llne. The slope representing velocity of LVOT flow propagation （Vp） was obtained automatically. The Vp was compared with dp/dtmax obtained by catheterization. Results Vp obtained by CAMS was （92.3 ± 11.4）cm/s and signifcantly correlated to dp/ dtmax（ r = 0.71, P 〈0. 001）. Conclusions Vp could be correctly obtained by CAMS, which would be a feasible method for evaluating the systolic function of the left ventricle. Also it is a possibility for evaluating the ventricular function in congenital heart disease.