M型、2D、Doppler三种方法对扩张型心肌病左室收缩功能的评价

EVALUATION OF LEFT VENTRICULAR CONTRACTILE FUNCTION IN DILATED CARDIOMYOPATHY USING M-MODE,TWO-DIMENSIONAL AND DOPPLER ECHOCARDIOGRAPHY

目的:探讨超声心动图M型、2D、Doppler三种方法估测扩张型心肌病(DCM)左室收缩功能的准确性及受影响因素。方法:运用超声心动图M型、2D、Doppler三种方法估测30例DCM患者左室收缩功能。测量射血分数(EF)及每搏量(SV)指标并在三种方法间进行比较。结果:DCM患者M型、2D两种方法测量EF无显著差异;M型、2D两种方法测量SV显著高于Doppler方法测值,而M型、2D两种方法间差异无统计学意义(P>0·05)。结论:由于受二尖瓣返流及室壁运动不协调等多个因素的影响,M型和2D两种方法测量DCM患者SV存在不同程度的高估。综合考虑各种影响因素,方可选择恰当的方法和参数,如实反映DCM左室收缩功能的情况。

Objective：To explore the factors that influence the accuracy of evaluating left ventricular contractile function in dilated cardiomyopathy（DCM） using M-mode, two-dimensional and Doppler echocardiography. Methods. A total of 30 patients with dilated cardiomyopathy were examined by M-mode, two-dimensional and Doppler echocardiography. Ejection fraction （EF） and stroke volume（SV） were measured and compared within the three methods above. Result： EF measured with M-mode and two-dimensional echoeardiography respectively showed no statistical difference. SV acquired with M-mode and two-dimensional methods was significantly increased compared with Doppler echocardiography. But there was no markedly difference in SV between M-mode and two-dimensional echocardiography. Conclusion：Because of some factors such as mitral regurgitation and dyssynergia of wall motion, SV in DCM patients acquired with M- mode and two-dimensional echocardiography were perhaps somewhat over-evaluated. It need to taking all the factors in account to select appropriate methods and evaluate left ventricular contractile function more accurately.