超声心动图联合64层螺旋CT评价左室收缩功能

Evaluating left ventricular systolic function:echocardiography versus 64-slice CT

目的比较超声心动图(UCG)和多层螺旋CT(MSCT)对左室射血分数(LVEF)的评估。方法对74例临床怀疑冠心病的患者进行超声心动图和64层螺旋CT检查,前者使用M型超声心动图Teichholz校正公式法测量LVEF,后者经过心功能分析软件处理,根据Simpson公式自动测定左室收缩末期容积、舒张末期容积,通过多层累积计算而得出LVEF。将两种检查所测得的结果进行比较。结果UCG与MSCT所测LVEF值(%)差异有显著性(P<0.01),并具有很好的相关性(r=0.888,P<0.01),MSCT所测的LVEF稍低于UCG。根据Bland-Altman方法,UCG与MSCT测定LVEF的差值为-0.0549±0.0284,一致性范围为-0.1117～0.0019。结论MSCT与UCG测量LVEF存在一定差异,但是两种检查对于左室收缩功能的评价均具有临床应用价值。

Objective To compare the concordance of echocardiography and multi-slice computed tomography （MSCT） in evaluating left ventricular systolic function. Methods Seventy-four patients with suspected coronary artery disease received echocardiography and MSCT examination. For echocardiography, left ventricular ejection fraction （LVEF） was calculated by using Teichholz corrective formula in M-mode. For MSCT, end-diastolic volume （EDV）, end-systolic volume （ESV） were calculated on the basis of the Simpson rule, the percentage of EF was calculated by using analysis software. Finally, compare the measurement of LVEF between the two examinations. Results LVEF determined with echocardiography correlated well with MSCT measurements （r=0. 888, P〈0.01）, moreover, LVEF of MSCT was lower than that of echocardiography （P 〈0.01）. With the Bland-Altman method, the mean difference of echocardiography and MSCT for LVEF was -0. 0549±0. 0284, the concordant range of the two examinations was -0. 1117±0. 0019. Conclusion Although there is certain difference in the measurement of LVEF between the two examinations, but both echocardiography and MSCT are of great value in evaluating left ventricular systolic function.